| 85. | M Kick, C Grosu, M Schuderer, C Scheurer, H Oberhofer Mobile Small Polarons Qualitatively Explain Conductivity in Lithium Titanium Oxide Battery Electrodes Journal Article Journal of Physical Chemistry Letters, 11 (7), pp. 2535-2540, 2020, ISSN: 1948-7185. Abstract | Links | Tags: Foundry Inorganic, Solid-Solid @article{, title = {Mobile Small Polarons Qualitatively Explain Conductivity in Lithium Titanium Oxide Battery Electrodes}, author = {M Kick and C Grosu and M Schuderer and C Scheurer and H Oberhofer}, url = {<Go to ISI>://WOS:000526348400022}, doi = {10.1021/acs.jpclett.0c00568}, issn = {1948-7185}, year = {2020}, date = {2020-03-12}, journal = {Journal of Physical Chemistry Letters}, volume = {11}, number = {7}, pages = {2535-2540}, abstract = {Lithium titanium oxide Li4Ti5O12 is an intriguing anode material promising particularly long-life batteries, due to its remarkable phase stability during (dis)charging of the cell. However, its usage is limited by its low intrinsic electronic conductivity. Introducing oxygen vacancies can be one method for overcoming this drawback, possibly by altering the charge carrier transport mechanism. We use Hubbard corrected density functional theory to show that polaronic states in combination with a possible hopping mechanism can play a crucial role in the experimentally observed increase in electronic conductivity. To gauge polaronic charge mobility, we compute the relative stabilities of different localization patterns and estimate polaron hopping barrier heights.}, keywords = {Foundry Inorganic, Solid-Solid}, pubstate = {published}, tppubtype = {article} } Lithium titanium oxide Li4Ti5O12 is an intriguing anode material promising particularly long-life batteries, due to its remarkable phase stability during (dis)charging of the cell. However, its usage is limited by its low intrinsic electronic conductivity. Introducing oxygen vacancies can be one method for overcoming this drawback, possibly by altering the charge carrier transport mechanism. We use Hubbard corrected density functional theory to show that polaronic states in combination with a possible hopping mechanism can play a crucial role in the experimentally observed increase in electronic conductivity. To gauge polaronic charge mobility, we compute the relative stabilities of different localization patterns and estimate polaron hopping barrier heights. |
| 84. | J Fichtner, S Watzele, B Garlyyev, R M Kluge, F Haimerl, H A El-Sayed, W J Li, F M Maillard, L Dubau, R Chattot, J Michalicka, J M Macak, W Wang, D Wang, T Gigl, C Hugenschmidt, A S Bandarenka Tailoring the Oxygen Reduction Activity of Pt Nanoparticles through Surface Defects: A Simple Top-Down Approach Journal Article Acs Catalysis, 10 (5), pp. 3131-3142, 2020, ISSN: 2155-5435. Abstract | Links | Tags: Foundry Inorganic, Solid-Solid @article{, title = {Tailoring the Oxygen Reduction Activity of Pt Nanoparticles through Surface Defects: A Simple Top-Down Approach}, author = {J Fichtner and S Watzele and B Garlyyev and R M Kluge and F Haimerl and H A El-Sayed and W J Li and F M Maillard and L Dubau and R Chattot and J Michalicka and J M Macak and W Wang and D Wang and T Gigl and C Hugenschmidt and A S Bandarenka}, url = {<Go to ISI>://WOS:000518876300024}, doi = {10.1021/acscatal.9b04974}, issn = {2155-5435}, year = {2020}, date = {2020-03-06}, journal = {Acs Catalysis}, volume = {10}, number = {5}, pages = {3131-3142}, abstract = {Results from Pt model catalyst surfaces have demonstrated that surface defects, in particular surface concavities, can improve the oxygen reduction reaction (ORR) kinetics. It is, however, a challenging task to synthesize nanostructured catalysts with such defective surfaces. Hence, we present a one-step and upscalable top-down approach to produce a Pt/C catalyst (with similar to 3 nm Pt nanoparticle diameter). Using high-resolution transmission electron microscopy and tomography, electrochemical techniques, high-energy X-ray measurements, and positron annihilation spectroscopy, we provide evidence of a high density of surface defects (including surface concavities). The ORR activity of the developed catalyst exceeds that of a commercial Pt/C catalyst, at least 2.7 times in terms of specific activity (similar to 1.62 mA/cm(Pt)(2), at 0.9 V vs the reversible hydrogen electrode) and at least 1.7 times in terms of mass activity (similar to 712 mA/mg(Pt)), which can be correlated to the enhanced amount of surface defects. In addition, the technique used here reduces the complexity of the synthesis (and therefore production costs) in comparison to state of the art bottom-up techniques.}, keywords = {Foundry Inorganic, Solid-Solid}, pubstate = {published}, tppubtype = {article} } Results from Pt model catalyst surfaces have demonstrated that surface defects, in particular surface concavities, can improve the oxygen reduction reaction (ORR) kinetics. It is, however, a challenging task to synthesize nanostructured catalysts with such defective surfaces. Hence, we present a one-step and upscalable top-down approach to produce a Pt/C catalyst (with similar to 3 nm Pt nanoparticle diameter). Using high-resolution transmission electron microscopy and tomography, electrochemical techniques, high-energy X-ray measurements, and positron annihilation spectroscopy, we provide evidence of a high density of surface defects (including surface concavities). The ORR activity of the developed catalyst exceeds that of a commercial Pt/C catalyst, at least 2.7 times in terms of specific activity (similar to 1.62 mA/cm(Pt)(2), at 0.9 V vs the reversible hydrogen electrode) and at least 1.7 times in terms of mass activity (similar to 712 mA/mg(Pt)), which can be correlated to the enhanced amount of surface defects. In addition, the technique used here reduces the complexity of the synthesis (and therefore production costs) in comparison to state of the art bottom-up techniques. |
| 83. | S J Hao, M Hetzl, V F Kunzelmann, S Matich, Q L Sai, C T Xia, I D Sharp, M Stutzmann Sub-bandgap optical spectroscopy of epitaxial beta-Ga2O3 thin films Journal Article Applied Physics Letters, 116 (9), 2020, ISSN: 0003-6951. Abstract | Links | Tags: Foundry Inorganic, Solid-Solid @article{, title = {Sub-bandgap optical spectroscopy of epitaxial beta-Ga2O3 thin films}, author = {S J Hao and M Hetzl and V F Kunzelmann and S Matich and Q L Sai and C T Xia and I D Sharp and M Stutzmann}, url = {<Go to ISI>://WOS:000519225900001}, doi = {10.1063/1.5143393}, issn = {0003-6951}, year = {2020}, date = {2020-03-02}, journal = {Applied Physics Letters}, volume = {116}, number = {9}, abstract = {Room temperature sub-gap optical absorption spectra measured by photothermal deflection spectroscopy were investigated for hetero- and homo-epitaxial beta-Ga2O3 layers grown by plasma-assisted molecular beam epitaxy as well as for a bulk crystal. The absorption spectra show a pronounced exponential Urbach tail with slope parameters of 120-150 meV in the spectral region between 4.5 and 5 eV, indicating an unusually large self-trapping energy of excitons. In addition, an absorption band related to deep defects is observed in the spectral region from 2.5 to 4.5 eV. The steepness of the Urbach tail as well as the strength of the defect-related absorption can be influenced and optimized by annealing at 900-1000 degrees C in an oxygen atmosphere. Similar features were also observed for bulk beta-Ga2O3 crystals and for homoepitaxial beta-Ga2O3 layers. The present results for beta-Ga2O3 are compared and discussed in the context of similar measurements for other wide-bandgap semiconductors of current interest in electronics and photocatalysis: GaN, ZnO, TiO2, and BiVO4.}, keywords = {Foundry Inorganic, Solid-Solid}, pubstate = {published}, tppubtype = {article} } Room temperature sub-gap optical absorption spectra measured by photothermal deflection spectroscopy were investigated for hetero- and homo-epitaxial beta-Ga2O3 layers grown by plasma-assisted molecular beam epitaxy as well as for a bulk crystal. The absorption spectra show a pronounced exponential Urbach tail with slope parameters of 120-150 meV in the spectral region between 4.5 and 5 eV, indicating an unusually large self-trapping energy of excitons. In addition, an absorption band related to deep defects is observed in the spectral region from 2.5 to 4.5 eV. The steepness of the Urbach tail as well as the strength of the defect-related absorption can be influenced and optimized by annealing at 900-1000 degrees C in an oxygen atmosphere. Similar features were also observed for bulk beta-Ga2O3 crystals and for homoepitaxial beta-Ga2O3 layers. The present results for beta-Ga2O3 are compared and discussed in the context of similar measurements for other wide-bandgap semiconductors of current interest in electronics and photocatalysis: GaN, ZnO, TiO2, and BiVO4. |
| 82. | R S Markl, N Hohn, E Hupf, L Biessmann, V Korstgens, L P Kreuzer, G Mangiapia, M Pomm, A Kriele, E Rivard, P Muller-Buschbaum Comparing the backfilling of mesoporous titania thin films with hole conductors of different sizes sharing the same mass density Journal Article Iucrj, 7 , pp. 268-275, 2020, ISSN: 2052-2525. Abstract | Links | Tags: Foundry Inorganic, Solid-Solid @article{, title = {Comparing the backfilling of mesoporous titania thin films with hole conductors of different sizes sharing the same mass density}, author = {R S Markl and N Hohn and E Hupf and L Biessmann and V Korstgens and L P Kreuzer and G Mangiapia and M Pomm and A Kriele and E Rivard and P Muller-Buschbaum}, url = {<Go to ISI>://WOS:000518799300015}, doi = {10.1107/s2052252520000913}, issn = {2052-2525}, year = {2020}, date = {2020-03-01}, journal = {Iucrj}, volume = {7}, pages = {268-275}, abstract = {Efficient infiltration of a mesoporous titania matrix with conducting organic polymers or small molecules is one key challenge to overcome for hybrid photovoltaic devices. A quantitative analysis of the backfilling efficiency with time-of-flight grazing incidence small-angle neutron scattering (ToF-GISANS) and scanning electron microscopy (SEM) measurements is presented. Differences in the morphology due to the backfilling of mesoporous titania thin films are compared for the macromolecule poly[4,8-bis(5-(2-ethylhexyl)-thiophen-2-yl)benzo[1,2-b;4,5-b']dithiophene-2,6-diyl-alt-(4-(2-ethylhexyl)-3-fluorothieno[3,4-b]thiophene-)-2-carboxylate-2-6-diyl)] (PTB7-Th) and the heavy-element containing small molecule 2-pinacolboronate-3-phenylphenanthro[9,10-b]tellurophene(PhenTe-BPinPh). Hence, a 1.7 times higher backfilling efficiency of almost 70% is achieved for the small molecule PhenTe-BPinPh compared with the polymer PTB7-Th despite sharing the same volumetric mass density. The precise characterization of structural changes due to backfilling reveals that the volumetric density of backfilled materials plays a minor role in obtaining good backfilling efficiencies and interfaces with large surface contact.}, keywords = {Foundry Inorganic, Solid-Solid}, pubstate = {published}, tppubtype = {article} } Efficient infiltration of a mesoporous titania matrix with conducting organic polymers or small molecules is one key challenge to overcome for hybrid photovoltaic devices. A quantitative analysis of the backfilling efficiency with time-of-flight grazing incidence small-angle neutron scattering (ToF-GISANS) and scanning electron microscopy (SEM) measurements is presented. Differences in the morphology due to the backfilling of mesoporous titania thin films are compared for the macromolecule poly[4,8-bis(5-(2-ethylhexyl)-thiophen-2-yl)benzo[1,2-b;4,5-b']dithiophene-2,6-diyl-alt-(4-(2-ethylhexyl)-3-fluorothieno[3,4-b]thiophene-)-2-carboxylate-2-6-diyl)] (PTB7-Th) and the heavy-element containing small molecule 2-pinacolboronate-3-phenylphenanthro[9,10-b]tellurophene(PhenTe-BPinPh). Hence, a 1.7 times higher backfilling efficiency of almost 70% is achieved for the small molecule PhenTe-BPinPh compared with the polymer PTB7-Th despite sharing the same volumetric mass density. The precise characterization of structural changes due to backfilling reveals that the volumetric density of backfilled materials plays a minor role in obtaining good backfilling efficiencies and interfaces with large surface contact. |
| 81. | S Oviedo-Casado, F Šanda, J Hauer, J Prior Magnetic pulses enable multidimensional optical spectroscopy of dark states Journal Article The Journal of Chemical Physics, 152 (8), pp. 084201, 2020, ISSN: 0021-9606. Links | Tags: Solid-Liquid @article{, title = {Magnetic pulses enable multidimensional optical spectroscopy of dark states}, author = {S Oviedo-Casado and F \v{S}anda and J Hauer and J Prior}, url = {https://doi.org/10.1063/1.5139409}, doi = {10.1063/1.5139409}, issn = {0021-9606}, year = {2020}, date = {2020-02-28}, journal = {The Journal of Chemical Physics}, volume = {152}, number = {8}, pages = {084201}, keywords = {Solid-Liquid}, pubstate = {published}, tppubtype = {article} } |
| 80. | L Hüttenhofer, F Eckmann, A Lauri, J Cambiasso, E Pensa, Y Li, E Cortés, I D Sharp, S A Maier Anapole Excitations in Oxygen-Vacancy-Rich TiO2–x Nanoresonators: Tuning the Absorption for Photocatalysis in the Visible Spectrum Journal Article ACS Nano, 14 (2), pp. 2456-2464, 2020, ISSN: 1936-0851. Links | Tags: Foundry Inorganic @article{, title = {Anapole Excitations in Oxygen-Vacancy-Rich TiO2\textendashx Nanoresonators: Tuning the Absorption for Photocatalysis in the Visible Spectrum}, author = {L H\"{u}ttenhofer and F Eckmann and A Lauri and J Cambiasso and E Pensa and Y Li and E Cort\'{e}s and I D Sharp and S A Maier}, url = {https://doi.org/10.1021/acsnano.9b09987}, doi = {10.1021/acsnano.9b09987}, issn = {1936-0851}, year = {2020}, date = {2020-02-25}, journal = {ACS Nano}, volume = {14}, number = {2}, pages = {2456-2464}, keywords = {Foundry Inorganic}, pubstate = {published}, tppubtype = {article} } |
| 79. | H Bi, C A Palma, Y X Gong, K Stallhofer, M Nuber, C Jing, F Meggendorfer, S Z Wen, C Y Yam, R Kienberger, M Elbing, M Mayor, H Iglev, J V Barth, J Reichert Electron-Phonon Coupling in Current-Driven Single-Molecule Junctions Journal Article Journal of the American Chemical Society, 142 (7), pp. 3384-3391, 2020, ISSN: 0002-7863. Abstract | Links | Tags: Foundry Inorganic, Solid-Solid @article{, title = {Electron-Phonon Coupling in Current-Driven Single-Molecule Junctions}, author = {H Bi and C A Palma and Y X Gong and K Stallhofer and M Nuber and C Jing and F Meggendorfer and S Z Wen and C Y Yam and R Kienberger and M Elbing and M Mayor and H Iglev and J V Barth and J Reichert}, url = {<Go to ISI>://WOS:000515214000020}, doi = {10.1021/jacs.9b07757}, issn = {0002-7863}, year = {2020}, date = {2020-02-19}, journal = {Journal of the American Chemical Society}, volume = {142}, number = {7}, pages = {3384-3391}, abstract = {Vibrational excitations provoked by coupling effects during charge transport through single molecules are intrinsic energy dissipation phenomena, in close analogy to electron-phonon coupling in solids. One fundamental challenge in molecular electronics is the quantitative determination of charge-vibrational (electron-phonon) coupling for single-molecule junctions. The ability to record electron-phonon coupling phenomena at the single-molecule level is a key prerequisite to fully rationalize and optimize charge-transport efficiencies for specific molecular configurations and currents. Here we exemplarily determine the pertaining coupling characteristics for a current-carrying chemically well-defined molecule by synchronous vibrational and current- voltage spectroscopy. These metal-molecule-metal junction insights are complemented by time-resolved infrared spectroscopy to assess the intramolecular vibrational relaxation dynamics. By measuring and analyzing the steady-state vibrational distribution during transient charge transport in a bis-phenylethynyl-anthracene derivative using anti-Stokes Raman scattering, we find similar to 0.5 vibrational excitations per elementary charge passing through the metal-moleculemetal junction, by means of a rate model ansatz and quantum-chemical calculations.}, keywords = {Foundry Inorganic, Solid-Solid}, pubstate = {published}, tppubtype = {article} } Vibrational excitations provoked by coupling effects during charge transport through single molecules are intrinsic energy dissipation phenomena, in close analogy to electron-phonon coupling in solids. One fundamental challenge in molecular electronics is the quantitative determination of charge-vibrational (electron-phonon) coupling for single-molecule junctions. The ability to record electron-phonon coupling phenomena at the single-molecule level is a key prerequisite to fully rationalize and optimize charge-transport efficiencies for specific molecular configurations and currents. Here we exemplarily determine the pertaining coupling characteristics for a current-carrying chemically well-defined molecule by synchronous vibrational and current- voltage spectroscopy. These metal-molecule-metal junction insights are complemented by time-resolved infrared spectroscopy to assess the intramolecular vibrational relaxation dynamics. By measuring and analyzing the steady-state vibrational distribution during transient charge transport in a bis-phenylethynyl-anthracene derivative using anti-Stokes Raman scattering, we find similar to 0.5 vibrational excitations per elementary charge passing through the metal-moleculemetal junction, by means of a rate model ansatz and quantum-chemical calculations. |
| 78. | S Harm, A-K Hatz, C Schneider, C Hoefer, C Hoch, B V Lotsch Finding the Right Blend: Interplay Between Structure and Sodium Ion Conductivity in the System Na5AlS4–Na4SiS4 Journal Article Frontiers in Chemistry, 8 , pp. 90, 2020, ISSN: 2296-2646. Abstract | Links | Tags: Solid-Solid @article{, title = {Finding the Right Blend: Interplay Between Structure and Sodium Ion Conductivity in the System Na5AlS4\textendashNa4SiS4}, author = {S Harm and A-K Hatz and C Schneider and C Hoefer and C Hoch and B V Lotsch}, url = {https://www.frontiersin.org/article/10.3389/fchem.2020.00090}, doi = {10.3389/fchem.2020.00090}, issn = {2296-2646}, year = {2020}, date = {2020-02-18}, journal = {Frontiers in Chemistry}, volume = {8}, pages = {90}, abstract = {The rational design of high performance sodium solid electrolytes is one of the key challenges in modern battery research. In this work, we identify new sodium ion conductors in the substitution series Na_{5-x}Al_{1-x}Si_{x}S4 (0 ≤ x ≤ 1), which are entirely based on earth-abundant elements. These compounds exhibit conductivities ranging from 1.64 · 10^{−7} for Na_{4}SiS_{4} to 2.04 · 10^{−5} for Na_{8.5}(AlS_{4})_{0.5}(SiS_{4})_{1.5} (x = 0.75). We determined the crystal structures of the Na^{+}-ion conductors Na_{4}SiS_{4} as well as hitherto unknown Na_{5}AlS_{4} and Na_{9}(AlS_{4})(SiS_{4}). Na^{+}-ion conduction pathways were calculated by bond valence energy landscape (BVEL) calculations for all new structures highlighting the influence of the local coordination symmetry of sodium ions on the energy landscape within this family. Our findings show that the interplay of charge carrier concentration and low site symmetry of sodium ions can enhance the conductivity by several orders of magnitude.}, keywords = {Solid-Solid}, pubstate = {published}, tppubtype = {article} } The rational design of high performance sodium solid electrolytes is one of the key challenges in modern battery research. In this work, we identify new sodium ion conductors in the substitution series Na5-xAl1-xSixS4 (0 ≤ x ≤ 1), which are entirely based on earth-abundant elements. These compounds exhibit conductivities ranging from 1.64 · 10−7 for Na4SiS4 to 2.04 · 10−5 for Na8.5(AlS4)0.5(SiS4)1.5 (x = 0.75). We determined the crystal structures of the Na+-ion conductors Na4SiS4 as well as hitherto unknown Na5AlS4 and Na9(AlS4)(SiS4). Na+-ion conduction pathways were calculated by bond valence energy landscape (BVEL) calculations for all new structures highlighting the influence of the local coordination symmetry of sodium ions on the energy landscape within this family. Our findings show that the interplay of charge carrier concentration and low site symmetry of sodium ions can enhance the conductivity by several orders of magnitude. |
| 77. | V Giegold, L Lange, R Ciesielski, A Hartschuh Non-linear Raman scattering intensities in graphene Journal Article Nanoscale, 2020, ISSN: 2040-3364. Abstract | Links | Tags: Foundry Inorganic @article{, title = {Non-linear Raman scattering intensities in graphene}, author = {V Giegold and L Lange and R Ciesielski and A Hartschuh}, url = {http://dx.doi.org/10.1039/C9NR10654E}, doi = {10.1039/C9NR10654E}, issn = {2040-3364}, year = {2020}, date = {2020-02-18}, journal = {Nanoscale}, abstract = {We show that the Raman scattering signals of the two dominant Raman bands G and 2D of graphene sensitively depend on the laser intensity in opposite ways. High electronic temperatures reached for pulsed laser excitation lead to an asymmetric Fermi\textendashDirac distribution at the different optically resonant states contributing to Raman scattering. This results in a partial Pauli blocking of destructively interfering quantum pathways for G band scattering, which is observed as a super-linear increase of the G band intensity with laser power. The 2D band, on the other hand, exhibits sub-linear intensity scaling due to the blocking of constructively interfering contributions. The opposite intensity dependencies of the two bands are found to reduce the observed 2D/G ratio, a key quantity used for characterizing graphene samples, by more than factor two for electronic temperatures around 3000 K.}, keywords = {Foundry Inorganic}, pubstate = {published}, tppubtype = {article} } We show that the Raman scattering signals of the two dominant Raman bands G and 2D of graphene sensitively depend on the laser intensity in opposite ways. High electronic temperatures reached for pulsed laser excitation lead to an asymmetric Fermi–Dirac distribution at the different optically resonant states contributing to Raman scattering. This results in a partial Pauli blocking of destructively interfering quantum pathways for G band scattering, which is observed as a super-linear increase of the G band intensity with laser power. The 2D band, on the other hand, exhibits sub-linear intensity scaling due to the blocking of constructively interfering contributions. The opposite intensity dependencies of the two bands are found to reduce the observed 2D/G ratio, a key quantity used for characterizing graphene samples, by more than factor two for electronic temperatures around 3000 K. |
| 76. | N Li, L Song, N Hohn, S Saxena, W Cao, X Y Jiang, P Muller-Buschbaum Nanoscale crystallization of a low band gap polymer in printed titania mesopores Journal Article Nanoscale, 12 (6), pp. 4085-4093, 2020, ISSN: 2040-3364. Abstract | Links | Tags: Foundry Inorganic, Solid-Solid @article{, title = {Nanoscale crystallization of a low band gap polymer in printed titania mesopores}, author = {N Li and L Song and N Hohn and S Saxena and W Cao and X Y Jiang and P Muller-Buschbaum}, url = {<Go to ISI>://WOS:000515391000053}, doi = {10.1039/c9nr08055d}, issn = {2040-3364}, year = {2020}, date = {2020-02-14}, journal = {Nanoscale}, volume = {12}, number = {6}, pages = {4085-4093}, abstract = {The crystallization behavior of the low band gap polymer poly[(5,6-difluoro-2,1,3-benzothiadiazol-4,7-diyl)-alt-(3,3 '''-di(2-octyldodecyl)2,2 ';5 ',2 '';5 '',2 '''-quaterthiophen-5,5 '''-diyl)] (PffBT4T-2OD) induced in printed mesoporous titania films with different pore sizes is studied to optimize the crystal orientation for an application in hybrid solar cells. The correlation between the crystal structure of PffBT4T-2OD and the titania pore size is investigated with a combination of grazing incidence wide-angle X-ray scattering (GIWAXS) and grazing incidence small-angle X-ray scattering (GISAXS). For comparison, poly(3-hexylthiophene) (P3HT) is also backfilled into the same four types of printed titania mesoporous scaffolds. Both, lattice constants and crystal sizes of edge-on oriented P3HT crystals decrease with increasing the titania pore size. Similarly and irrespective of the crystal orientation, a denser stacking of PffBT4T-2OD chains is found for larger pore sizes of the titania matrix. For an edge-on orientation, also bigger PffBT4T-2OD crystals are favorably formed in smaller pores, whereas for a face-on orientation, PffBT4T-2OD crystals increase with increasing size of the titania pores. Thus, the best ratio of face-on to edge-on crystals for PffBT4T-2OD is obtained through infiltration into large titania pores.}, keywords = {Foundry Inorganic, Solid-Solid}, pubstate = {published}, tppubtype = {article} } The crystallization behavior of the low band gap polymer poly[(5,6-difluoro-2,1,3-benzothiadiazol-4,7-diyl)-alt-(3,3 '''-di(2-octyldodecyl)2,2 ';5 ',2 '';5 '',2 '''-quaterthiophen-5,5 '''-diyl)] (PffBT4T-2OD) induced in printed mesoporous titania films with different pore sizes is studied to optimize the crystal orientation for an application in hybrid solar cells. The correlation between the crystal structure of PffBT4T-2OD and the titania pore size is investigated with a combination of grazing incidence wide-angle X-ray scattering (GIWAXS) and grazing incidence small-angle X-ray scattering (GISAXS). For comparison, poly(3-hexylthiophene) (P3HT) is also backfilled into the same four types of printed titania mesoporous scaffolds. Both, lattice constants and crystal sizes of edge-on oriented P3HT crystals decrease with increasing the titania pore size. Similarly and irrespective of the crystal orientation, a denser stacking of PffBT4T-2OD chains is found for larger pore sizes of the titania matrix. For an edge-on orientation, also bigger PffBT4T-2OD crystals are favorably formed in smaller pores, whereas for a face-on orientation, PffBT4T-2OD crystals increase with increasing size of the titania pores. Thus, the best ratio of face-on to edge-on crystals for PffBT4T-2OD is obtained through infiltration into large titania pores. |
| 75. | M Rück, B Garlyyev, F Mayr, A S Bandarenka, A Gagliardi Oxygen Reduction Activities of Strained Platinum Core–Shell Electrocatalysts Predicted by Machine Learning Journal Article The Journal of Physical Chemistry Letters, pp. 1773-1780, 2020. Links | Tags: Solid-Liquid @article{, title = {Oxygen Reduction Activities of Strained Platinum Core\textendashShell Electrocatalysts Predicted by Machine Learning}, author = {M R\"{u}ck and B Garlyyev and F Mayr and A S Bandarenka and A Gagliardi}, url = {https://doi.org/10.1021/acs.jpclett.0c00214}, doi = {10.1021/acs.jpclett.0c00214}, year = {2020}, date = {2020-02-14}, journal = {The Journal of Physical Chemistry Letters}, pages = {1773-1780}, keywords = {Solid-Liquid}, pubstate = {published}, tppubtype = {article} } |
| 74. | L Grabenhorst, K Trofymchuk, F Steiner, V Glembockyte, P Tinnefeld Fluorophore photostability and saturation in the hotspot of DNA origami nanoantennas Journal Article Methods and Applications in Fluorescence, 8 (2), pp. 024003, 2020, ISSN: 2050-6120. Abstract | Links | Tags: Foundry Organic, Molecularly-Functionalized @article{, title = {Fluorophore photostability and saturation in the hotspot of DNA origami nanoantennas}, author = {L Grabenhorst and K Trofymchuk and F Steiner and V Glembockyte and P Tinnefeld}, url = {http://dx.doi.org/10.1088/2050-6120/ab6ac8}, doi = {10.1088/2050-6120/ab6ac8}, issn = {2050-6120}, year = {2020}, date = {2020-02-05}, journal = {Methods and Applications in Fluorescence}, volume = {8}, number = {2}, pages = {024003}, abstract = {Fluorescent dyes used for single-molecule spectroscopy can undergo millions of excitation-emission cycles before photobleaching. Due to the upconcentration of light in a plasmonic hotspot, the conditions for fluorescent dyes are even more demanding in DNA origami nanoantennas. Here, we briefly review the current state of fluorophore stabilization for single-molecule imaging and reveal additional factors relevant in the context of plasmonic fluorescence enhancement. We show that despite the improved photostability of single-molecule fluorophores by DNA origami nanoantennas, their performance in the intense electric fields in plasmonic hotspots is still limited by the underlying photophysical processes, such as formation of dim states and photoisomerization. These photophysical processes limit the photon count rates, increase heterogeneity and aggravate quantification of fluorescence enhancement factors. These factors also reduce the time resolution that can be achieved in biophysical single-molecule experiments. Finally, we show how the photophysics of a DNA hairpin assay with a fluorophore-quencher pair can be influenced by plasmonic DNA origami nanoantennas leading to implications for their use in fluorescence-based diagnostic assays. Especially, we show that such assays can produce false positive results by premature photobleaching of the dark quencher.}, keywords = {Foundry Organic, Molecularly-Functionalized}, pubstate = {published}, tppubtype = {article} } Fluorescent dyes used for single-molecule spectroscopy can undergo millions of excitation-emission cycles before photobleaching. Due to the upconcentration of light in a plasmonic hotspot, the conditions for fluorescent dyes are even more demanding in DNA origami nanoantennas. Here, we briefly review the current state of fluorophore stabilization for single-molecule imaging and reveal additional factors relevant in the context of plasmonic fluorescence enhancement. We show that despite the improved photostability of single-molecule fluorophores by DNA origami nanoantennas, their performance in the intense electric fields in plasmonic hotspots is still limited by the underlying photophysical processes, such as formation of dim states and photoisomerization. These photophysical processes limit the photon count rates, increase heterogeneity and aggravate quantification of fluorescence enhancement factors. These factors also reduce the time resolution that can be achieved in biophysical single-molecule experiments. Finally, we show how the photophysics of a DNA hairpin assay with a fluorophore-quencher pair can be influenced by plasmonic DNA origami nanoantennas leading to implications for their use in fluorescence-based diagnostic assays. Especially, we show that such assays can produce false positive results by premature photobleaching of the dark quencher. |
| 73. | D Ruhstorfer, S Mejia, M Ramsteiner, M Döblinger, H Riedl, J J Finley, G Koblmüller Demonstration of n-type behavior in catalyst-free Si-doped GaAs nanowires grown by molecular beam epitaxy Journal Article Applied Physics Letters, 116 (5), pp. 052101, 2020. Links | Tags: Foundry Inorganic, Molecularly-Functionalized @article{, title = {Demonstration of n-type behavior in catalyst-free Si-doped GaAs nanowires grown by molecular beam epitaxy}, author = {D Ruhstorfer and S Mejia and M Ramsteiner and M D\"{o}blinger and H Riedl and J J Finley and G Koblm\"{u}ller}, url = {https://aip.scitation.org/doi/abs/10.1063/1.5134687}, doi = {10.1063/1.5134687}, year = {2020}, date = {2020-02-04}, journal = {Applied Physics Letters}, volume = {116}, number = {5}, pages = {052101}, keywords = {Foundry Inorganic, Molecularly-Functionalized}, pubstate = {published}, tppubtype = {article} } |
| 72. | O E O Zeman, Von F O Rohr, L Neudert, W Schnick Facile One-step Synthesis of Zn1-xMnxSiN2 Nitride Semiconductor Solid Solutions via Solid-state Metathesis Reaction Journal Article Zeitschrift Fur Anorganische Und Allgemeine Chemie, 2020, ISSN: 0044-2313. Links | Tags: Foundry Inorganic @article{, title = {Facile One-step Synthesis of Zn1-xMnxSiN2 Nitride Semiconductor Solid Solutions via Solid-state Metathesis Reaction}, author = {O E O Zeman and Von F O Rohr and L Neudert and W Schnick}, url = {<Go to ISI>://WOS:000510472600001}, doi = {10.1002/zaac.201900315}, issn = {0044-2313}, year = {2020}, date = {2020-02-03}, journal = {Zeitschrift Fur Anorganische Und Allgemeine Chemie}, keywords = {Foundry Inorganic}, pubstate = {published}, tppubtype = {article} } |
| 71. | M Asher, D Angerer, R Korobko, Y Diskin-Posner, D A Egger, O Yaffe Anharmonic Lattice Vibrations in Small-Molecule Organic Semiconductors Journal Article Advanced Materials, 32 (10), pp. 1908028, 2020, ISSN: 0935-9648. Abstract | Links | Tags: Foundry Organic @article{, title = {Anharmonic Lattice Vibrations in Small-Molecule Organic Semiconductors}, author = {M Asher and D Angerer and R Korobko and Y Diskin-Posner and D A Egger and O Yaffe}, url = {https://onlinelibrary.wiley.com/doi/abs/10.1002/adma.201908028}, doi = {10.1002/adma.201908028}, issn = {0935-9648}, year = {2020}, date = {2020-01-31}, journal = {Advanced Materials}, volume = {32}, number = {10}, pages = {1908028}, abstract = {Abstract The intermolecular lattice vibrations in small-molecule organic semiconductors have a strong impact on their functional properties. Existing models treat the lattice vibrations within the harmonic approximation. In this work, polarization-orientation (PO) Raman measurements are used to monitor the temperature-evolution of the symmetry of lattice vibrations in anthracene and pentacene single crystals. Combined with first-principles calculations, it is shown that at 10 K, the lattice dynamics of the crystals are indeed harmonic. However, as the temperature is increased, specific lattice modes gradually lose their PO dependence and become more liquid-like. This finding is indicative of a dynamic symmetry breaking of the crystal structure and shows clear evidence of the strongly anharmonic nature of these vibrations. Pentacene also shows an apparent phase transition between 80 and 150 K, indicated by a change in the vibrational symmetry of one of the lattice modes. These findings lay the groundwork for accurate predictions of the electronic properties of high-mobility organic semiconductors at room temperature.}, keywords = {Foundry Organic}, pubstate = {published}, tppubtype = {article} } Abstract The intermolecular lattice vibrations in small-molecule organic semiconductors have a strong impact on their functional properties. Existing models treat the lattice vibrations within the harmonic approximation. In this work, polarization-orientation (PO) Raman measurements are used to monitor the temperature-evolution of the symmetry of lattice vibrations in anthracene and pentacene single crystals. Combined with first-principles calculations, it is shown that at 10 K, the lattice dynamics of the crystals are indeed harmonic. However, as the temperature is increased, specific lattice modes gradually lose their PO dependence and become more liquid-like. This finding is indicative of a dynamic symmetry breaking of the crystal structure and shows clear evidence of the strongly anharmonic nature of these vibrations. Pentacene also shows an apparent phase transition between 80 and 150 K, indicated by a change in the vibrational symmetry of one of the lattice modes. These findings lay the groundwork for accurate predictions of the electronic properties of high-mobility organic semiconductors at room temperature. |
| 70. | L Polavarapu, S Paul, E Bladt, A F Richter, M Döblinger, Y Tong, H Huang, A Dey, S Bals, T Debnath, J Feldmann Manganese Doping Induced Quantum Confinement within Host Perovskite Nanocrystals through Ruddlesden-Popper Defects Journal Article Angewandte Chemie International Edition, n/a (n/a), 2020, ISSN: 1433-7851. Abstract | Links | Tags: Foundry Inorganic @article{, title = {Manganese Doping Induced Quantum Confinement within Host Perovskite Nanocrystals through Ruddlesden-Popper Defects}, author = {L Polavarapu and S Paul and E Bladt and A F Richter and M D\"{o}blinger and Y Tong and H Huang and A Dey and S Bals and T Debnath and J Feldmann}, url = {https://doi.org/10.1002/anie.201914473}, doi = {10.1002/anie.201914473}, issn = {1433-7851}, year = {2020}, date = {2020-01-30}, journal = {Angewandte Chemie International Edition}, volume = {n/a}, number = {n/a}, abstract = {The concept of doping Mn 2+ ions into II-VI semiconductor nanocrystals (NCs) has recently extended to perovskite NCs. To date, most studies on Mn 2+ doped NCs focus on enhancing the emission related to the Mn 2 + dopant via an energy transfer mechanism. In this work, we found that the doping of Mn 2+ ions into CsPbCl 3 NCs not only results in a Mn 2+ -related orange emission, but also strongly influences the excitonic properties of the host NCs. We observe for the first time that Mn 2+ doping leads to the formation of Ruddlesden-Popper (R.P.) defects and thus induces quantum confinement within the host NCs. We find that a slight doping with Mn 2+ ions improves the size distribution of the NCs, which results in a prominent excitonic peak. However, with increasing the Mn 2+ concentration, the number of R.P. planes increases leading to smaller single crystal domains. The thus enhanced confinement and crystal inhomogeneity cause a gradual blue shift and broadening of the excitonic transition, respectively.}, keywords = {Foundry Inorganic}, pubstate = {published}, tppubtype = {article} } The concept of doping Mn 2+ ions into II-VI semiconductor nanocrystals (NCs) has recently extended to perovskite NCs. To date, most studies on Mn 2+ doped NCs focus on enhancing the emission related to the Mn 2 + dopant via an energy transfer mechanism. In this work, we found that the doping of Mn 2+ ions into CsPbCl 3 NCs not only results in a Mn 2+ -related orange emission, but also strongly influences the excitonic properties of the host NCs. We observe for the first time that Mn 2+ doping leads to the formation of Ruddlesden-Popper (R.P.) defects and thus induces quantum confinement within the host NCs. We find that a slight doping with Mn 2+ ions improves the size distribution of the NCs, which results in a prominent excitonic peak. However, with increasing the Mn 2+ concentration, the number of R.P. planes increases leading to smaller single crystal domains. The thus enhanced confinement and crystal inhomogeneity cause a gradual blue shift and broadening of the excitonic transition, respectively. |
| 69. | T Scholz, F Pielnhofer, R Eger, B V Lotsch Lanthanide orthothiophosphates revisited: single-crystal X-ray, Raman, and DFT studies of TmPS4 and YbPS4 Journal Article Zeitschrift für Naturforschung B, 75 , 2020. Links | Tags: Foundry Inorganic @article{, title = {Lanthanide orthothiophosphates revisited: single-crystal X-ray, Raman, and DFT studies of TmPS4 and YbPS4}, author = {T Scholz and F Pielnhofer and R Eger and B V Lotsch}, doi = {10.1515/znb-2019-0217}, year = {2020}, date = {2020-01-28}, journal = {Zeitschrift f\"{u}r Naturforschung B}, volume = {75}, keywords = {Foundry Inorganic}, pubstate = {published}, tppubtype = {article} } |
| 68. | S S Yin, L Song, S L Xia, Y J Cheng, N Hohn, W Chen, K Wang, W Cao, S J Hou, P Muller-Buschbaum Key Factors for Template-Oriented Porous Titania Synthesis: Solvents and Catalysts Journal Article Small Methods, 2020, ISSN: 2366-9608. Links | Tags: Solid-Solid @article{, title = {Key Factors for Template-Oriented Porous Titania Synthesis: Solvents and Catalysts}, author = {S S Yin and L Song and S L Xia and Y J Cheng and N Hohn and W Chen and K Wang and W Cao and S J Hou and P Muller-Buschbaum}, url = {<Go to ISI>://WOS:000507321300001}, doi = {10.1002/smtd.201900689}, issn = {2366-9608}, year = {2020}, date = {2020-01-15}, journal = {Small Methods}, keywords = {Solid-Solid}, pubstate = {published}, tppubtype = {article} } |
| 67. | W J Li, S Xue, S Watzele, S J Hou, J Fichtner, A L Semrau, L J Zhou, A Welle, A S Bandarenka, R A Fischer Advanced Bifunctional Oxygen Reduction and Evolution Electrocatalyst Derived from Surface-Mounted Metal-Organic Frameworks Journal Article Angewandte Chemie-International Edition, 2020, ISSN: 1433-7851. Links | Tags: Molecularly-Functionalized, Solid-Liquid @article{, title = {Advanced Bifunctional Oxygen Reduction and Evolution Electrocatalyst Derived from Surface-Mounted Metal-Organic Frameworks}, author = {W J Li and S Xue and S Watzele and S J Hou and J Fichtner and A L Semrau and L J Zhou and A Welle and A S Bandarenka and R A Fischer}, url = {<Go to ISI>://WOS:000509752400001}, doi = {10.1002/anie.201916507}, issn = {1433-7851}, year = {2020}, date = {2020-01-08}, journal = {Angewandte Chemie-International Edition}, keywords = {Molecularly-Functionalized, Solid-Liquid}, pubstate = {published}, tppubtype = {article} } |
| 66. | C Heshmatpour, J Hauer, F Sanda Interplay of exciton annihilation and transport in fifth order electronic spectroscopy Journal Article Chemical Physics, 528 , 2020, ISSN: 0301-0104. Links | Tags: Molecularly-Functionalized, Solid-Liquid @article{, title = {Interplay of exciton annihilation and transport in fifth order electronic spectroscopy}, author = {C Heshmatpour and J Hauer and F Sanda}, url = {<Go to ISI>://WOS:000490758300009}, doi = {10.1016/j.chemphys.2019.110433}, issn = {0301-0104}, year = {2020}, date = {2020-01-01}, journal = {Chemical Physics}, volume = {528}, keywords = {Molecularly-Functionalized, Solid-Liquid}, pubstate = {published}, tppubtype = {article} } |
| 65. | M Däntl, P Ganter, K Szendrei-Temesi, A Jiménez-Solano, B V Lotsch Customizing H3Sb3P2O14 nanosheet sensors by reversible vapor-phase amine intercalation Journal Article Nanoscale Horizons, 5 (1), pp. 74-81, 2020, ISSN: 2055-6756. Abstract | Links | Tags: Foundry Inorganic @article{, title = {Customizing H3Sb3P2O14 nanosheet sensors by reversible vapor-phase amine intercalation}, author = {M D\"{a}ntl and P Ganter and K Szendrei-Temesi and A Jim\'{e}nez-Solano and B V Lotsch}, url = {http://dx.doi.org/10.1039/C9NH00434C}, doi = {10.1039/C9NH00434C}, issn = {2055-6756}, year = {2020}, date = {2020-01-01}, journal = {Nanoscale Horizons}, volume = {5}, number = {1}, pages = {74-81}, abstract = {Harvesting the large property space of 2D materials and their molecular-level fine-tuning is of utmost importance for future applications such as miniaturized sensors for environmental monitoring or biomedical detection. Therefore, developing straightforward strategies for the reversible and gradual fine-tuning of nanosheet properties with soft chemical intercalation methods is in high demand. Herein we address this challenge by customizing the host\textendashguest interactions of nanosheets based on the solid acid H3Sb3P2O14 by vapor-phase amine-intercalation with primary alkylamines. Fine-tuning of the structural and chemical properties of the intercalated nanosheets is achieved by applying a two-step, post-synthetic intercalation strategy via the vapor phase. The method allows for the gradual and reversible replacement of one amine type by another. Hence, fine-tuning of the d-spacing in the sub-r{A} regime is accomplished and offers exquisite control of the properties of the thin films such as refractive index, polarity, film thickness and sensitivity towards solvent vapors. Moreover, we employ amine replacement to pattern thin films by locally resolved amine intercalation and subsequent washing, leading to spatially dependent property profiles. This process thus adds a new vapor-phase, amine-based variant to the toolbox of soft lithography.}, keywords = {Foundry Inorganic}, pubstate = {published}, tppubtype = {article} } Harvesting the large property space of 2D materials and their molecular-level fine-tuning is of utmost importance for future applications such as miniaturized sensors for environmental monitoring or biomedical detection. Therefore, developing straightforward strategies for the reversible and gradual fine-tuning of nanosheet properties with soft chemical intercalation methods is in high demand. Herein we address this challenge by customizing the host–guest interactions of nanosheets based on the solid acid H3Sb3P2O14 by vapor-phase amine-intercalation with primary alkylamines. Fine-tuning of the structural and chemical properties of the intercalated nanosheets is achieved by applying a two-step, post-synthetic intercalation strategy via the vapor phase. The method allows for the gradual and reversible replacement of one amine type by another. Hence, fine-tuning of the d-spacing in the sub-Å regime is accomplished and offers exquisite control of the properties of the thin films such as refractive index, polarity, film thickness and sensitivity towards solvent vapors. Moreover, we employ amine replacement to pattern thin films by locally resolved amine intercalation and subsequent washing, leading to spatially dependent property profiles. This process thus adds a new vapor-phase, amine-based variant to the toolbox of soft lithography. |
| 64. | J Klein, A Kerelsky, M Lorke, M Florian, F Sigger, J Kiemle, M C Reuter, T Taniguchi, K Watanabe, J J Finley, A N Pasupathy, A W Holleitner, F M Ross, U Wurstbauer Impact of substrate induced band tail states on the electronic and optical properties of MoS2 Journal Article Applied Physics Letters, 115 (26), 2019, ISSN: 0003-6951. Links | Tags: Foundry Inorganic @article{, title = {Impact of substrate induced band tail states on the electronic and optical properties of MoS2}, author = {J Klein and A Kerelsky and M Lorke and M Florian and F Sigger and J Kiemle and M C Reuter and T Taniguchi and K Watanabe and J J Finley and A N Pasupathy and A W Holleitner and F M Ross and U Wurstbauer}, url = {<Go to ISI>://WOS:000505613600019}, doi = {10.1063/1.5131270}, issn = {0003-6951}, year = {2019}, date = {2019-12-30}, journal = {Applied Physics Letters}, volume = {115}, number = {26}, keywords = {Foundry Inorganic}, pubstate = {published}, tppubtype = {article} } |
| 63. | A Haffner, A K Hatz, C Hoch, B V Lotsch, D Johrendt Synthesis and Structure of the Sodium Phosphidosilicate Na2SiP2 Journal Article European Journal of Inorganic Chemistry, 2019, ISSN: 1434-1948. Links | Tags: Foundry Inorganic @article{, title = {Synthesis and Structure of the Sodium Phosphidosilicate Na2SiP2}, author = {A Haffner and A K Hatz and C Hoch and B V Lotsch and D Johrendt}, url = {<Go to ISI>://WOS:000511390500001}, doi = {10.1002/ejic.201901083}, issn = {1434-1948}, year = {2019}, date = {2019-12-29}, journal = {European Journal of Inorganic Chemistry}, keywords = {Foundry Inorganic}, pubstate = {published}, tppubtype = {article} } |
| 62. | A M Ferrenti, S Klemenz, S M Lei, X Y Song, P Ganter, B V Lotsch, L M Schoop Change in Magnetic Properties upon Chemical Exfoliation of FeOCl Journal Article Inorganic Chemistry, 59 (2), pp. 1176-1182, 2019, ISSN: 0020-1669. Links | Tags: Foundry Inorganic @article{, title = {Change in Magnetic Properties upon Chemical Exfoliation of FeOCl}, author = {A M Ferrenti and S Klemenz and S M Lei and X Y Song and P Ganter and B V Lotsch and L M Schoop}, url = {<Go to ISI>://WOS:000509420100027}, doi = {10.1021/acs.inorgchem.9b02856}, issn = {0020-1669}, year = {2019}, date = {2019-12-27}, journal = {Inorganic Chemistry}, volume = {59}, number = {2}, pages = {1176-1182}, keywords = {Foundry Inorganic}, pubstate = {published}, tppubtype = {article} } |
| 61. | J Schedlbauer, P Wilhelm, L Grabenhorst, M E Federl, B Lalkens, F Hinderer, U Scherf, S Höger, P Tinnefeld, S Bange, J Vogelsang, J M Lupton Ultrafast Single-Molecule Fluorescence Measured by Femtosecond Double-Pulse Excitation Photon Antibunching Journal Article Nano Letters, 2019, ISSN: 1530-6984. Links | Tags: Foundry Organic, Molecularly-Functionalized @article{, title = {Ultrafast Single-Molecule Fluorescence Measured by Femtosecond Double-Pulse Excitation Photon Antibunching}, author = {J Schedlbauer and P Wilhelm and L Grabenhorst and M E Federl and B Lalkens and F Hinderer and U Scherf and S H\"{o}ger and P Tinnefeld and S Bange and J Vogelsang and J M Lupton}, url = {https://doi.org/10.1021/acs.nanolett.9b04354}, doi = {10.1021/acs.nanolett.9b04354}, issn = {1530-6984}, year = {2019}, date = {2019-12-23}, journal = {Nano Letters}, keywords = {Foundry Organic, Molecularly-Functionalized}, pubstate = {published}, tppubtype = {article} } |
| 60. | S Zhang, L Diehl, S Wrede, B V Lotsch, C Scheu Structural Evolution of Ni-Based Co-Catalysts on [Ca2Nb3O10]− Nanosheets during Heating and Their Photocatalytic Properties Journal Article Catalysts, 10 (1), pp. 13, 2019, ISSN: 2073-4344. Links | Tags: Foundry Inorganic @article{, title = {Structural Evolution of Ni-Based Co-Catalysts on [Ca2Nb3O10]− Nanosheets during Heating and Their Photocatalytic Properties}, author = {S Zhang and L Diehl and S Wrede and B V Lotsch and C Scheu}, url = {https://www.mdpi.com/2073-4344/10/1/13}, issn = {2073-4344}, year = {2019}, date = {2019-12-20}, journal = {Catalysts}, volume = {10}, number = {1}, pages = {13}, keywords = {Foundry Inorganic}, pubstate = {published}, tppubtype = {article} } |
| 59. | Y Negrín-Montecelo, M Comesaña-Hermo, L K Khorashad, A Sousa-Castillo, Z Wang, M Pérez-Lorenzo, T Liedl, A O Govorov, M A Correa-Duarte ACS Energy Letters, pp. 395-402, 2019. Links | Tags: Foundry Inorganic, Molecularly-Functionalized @article{, title = {Photophysical Effects behind the Efficiency of Hot Electron Injection in Plasmon-Assisted Catalysis: The Joint Role of Morphology and Composition}, author = {Y Negr\'{i}n-Montecelo and M Comesa\~{n}a-Hermo and L K Khorashad and A Sousa-Castillo and Z Wang and M P\'{e}rez-Lorenzo and T Liedl and A O Govorov and M A Correa-Duarte}, url = {https://doi.org/10.1021/acsenergylett.9b02478}, doi = {10.1021/acsenergylett.9b02478}, year = {2019}, date = {2019-12-12}, journal = {ACS Energy Letters}, pages = {395-402}, keywords = {Foundry Inorganic, Molecularly-Functionalized}, pubstate = {published}, tppubtype = {article} } |
| 58. | S Fust, A Faustmann, D J Carrad, J Bissinger, B Loitsch, M Döblinger, J Becker, G Abstreiter, J J Finley, G Koblmüller Quantum-Confinement-Enhanced Thermoelectric Properties in Modulation-Doped GaAs–AlGaAs Core–Shell Nanowires Journal Article Advanced Materials, 32 (4), pp. 1905458, 2019, ISSN: 0935-9648. Abstract | Links | Tags: Foundry Inorganic, Molecularly-Functionalized @article{, title = {Quantum-Confinement-Enhanced Thermoelectric Properties in Modulation-Doped GaAs\textendashAlGaAs Core\textendashShell Nanowires}, author = {S Fust and A Faustmann and D J Carrad and J Bissinger and B Loitsch and M D\"{o}blinger and J Becker and G Abstreiter and J J Finley and G Koblm\"{u}ller}, url = {https://onlinelibrary.wiley.com/doi/abs/10.1002/adma.201905458}, doi = {10.1002/adma.201905458}, issn = {0935-9648}, year = {2019}, date = {2019-12-09}, journal = {Advanced Materials}, volume = {32}, number = {4}, pages = {1905458}, abstract = {Abstract Nanowires (NWs) hold great potential in advanced thermoelectrics due to their reduced dimensions and low-dimensional electronic character. However, unfavorable links between electrical and thermal conductivity in state-of-the-art unpassivated NWs have, so far, prevented the full exploitation of their distinct advantages. A promising model system for a surface-passivated one-dimensional (1D)-quantum confined NW thermoelectric is developed that enables simultaneously the observation of enhanced thermopower via quantum oscillations in the thermoelectric transport and a strong reduction in thermal conductivity induced by the core\textendashshell heterostructure. High-mobility modulation-doped GaAs/AlGaAs core\textendashshell NWs with thin (sub-40 nm) GaAs NW core channel are employed, where the electrical and thermoelectric transport is characterized on the same exact 1D-channel. 1D-sub-band transport at low temperature is verified by a discrete stepwise increase in the conductance, which coincided with strong oscillations in the corresponding Seebeck voltage that decay with increasing sub-band number. Peak Seebeck coefficients as high as ≈65\textendash85 µV K−1 are observed for the lowest sub-bands, resulting in equivalent thermopower of S2σ ≈ 60 µW m−1 K−2 and S2G ≈ 0.06 pW K−2 within a single sub-band. Remarkably, these core\textendashshell NW heterostructures also exhibit thermal conductivities as low as ≈3 W m−1 K−1, about one order of magnitude lower than state-of-the-art unpassivated GaAs NWs.}, keywords = {Foundry Inorganic, Molecularly-Functionalized}, pubstate = {published}, tppubtype = {article} } Abstract Nanowires (NWs) hold great potential in advanced thermoelectrics due to their reduced dimensions and low-dimensional electronic character. However, unfavorable links between electrical and thermal conductivity in state-of-the-art unpassivated NWs have, so far, prevented the full exploitation of their distinct advantages. A promising model system for a surface-passivated one-dimensional (1D)-quantum confined NW thermoelectric is developed that enables simultaneously the observation of enhanced thermopower via quantum oscillations in the thermoelectric transport and a strong reduction in thermal conductivity induced by the core–shell heterostructure. High-mobility modulation-doped GaAs/AlGaAs core–shell NWs with thin (sub-40 nm) GaAs NW core channel are employed, where the electrical and thermoelectric transport is characterized on the same exact 1D-channel. 1D-sub-band transport at low temperature is verified by a discrete stepwise increase in the conductance, which coincided with strong oscillations in the corresponding Seebeck voltage that decay with increasing sub-band number. Peak Seebeck coefficients as high as ≈65–85 µV K−1 are observed for the lowest sub-bands, resulting in equivalent thermopower of S2σ ≈ 60 µW m−1 K−2 and S2G ≈ 0.06 pW K−2 within a single sub-band. Remarkably, these core–shell NW heterostructures also exhibit thermal conductivities as low as ≈3 W m−1 K−1, about one order of magnitude lower than state-of-the-art unpassivated GaAs NWs. |
| 57. | T W He, K Reuter, A J Du Atomically dispersed asymmetric Cu-B pair on 2D carbon nitride synergistically boosts the conversion of CO into C-2 products Journal Article Journal of Materials Chemistry A, 8 (2), pp. 599-606, 2019, ISSN: 2050-7488. Links | Tags: Foundry Inorganic @article{, title = {Atomically dispersed asymmetric Cu-B pair on 2D carbon nitride synergistically boosts the conversion of CO into C-2 products}, author = {T W He and K Reuter and A J Du}, url = {<Go to ISI>://WOS:000505561500008}, doi = {10.1039/c9ta12090d}, issn = {2050-7488}, year = {2019}, date = {2019-12-09}, journal = {Journal of Materials Chemistry A}, volume = {8}, number = {2}, pages = {599-606}, keywords = {Foundry Inorganic}, pubstate = {published}, tppubtype = {article} } |
| 56. | F Podjaski, D Weber, S Zhang, L Diehl, R Eger, V Duppel, Alarcon E Llado, G Richter, F Haase, A Fontcuberta I Morral, C Scheu, B V Lotsch Rational strain engineering in delafossite oxides for highly efficient hydrogen evolution catalysis in acidic media Journal Article Nature Catalysis, 3 , pp. 1-9, 2019. Links | Tags: Solid-Liquid @article{, title = {Rational strain engineering in delafossite oxides for highly efficient hydrogen evolution catalysis in acidic media}, author = {F Podjaski and D Weber and S Zhang and L Diehl and R Eger and V Duppel and Alarcon E Llado and G Richter and F Haase and A Fontcuberta I Morral and C Scheu and B V Lotsch}, doi = {10.1038/s41929-019-0400-x}, year = {2019}, date = {2019-12-01}, journal = {Nature Catalysis}, volume = {3}, pages = {1-9}, keywords = {Solid-Liquid}, pubstate = {published}, tppubtype = {article} } |
| 55. | D A Duncan, P S Deimel, A Wiengarten, M Paszkiewicz, P C Aguilar, R G Acres, F Klappenberger, W Auwarter, A P Seitsonen, J V Barth, F Allegretti Bottom-Up Fabrication of a Metal-Supported Oxo-Metal Porphyrin Journal Article Journal of Physical Chemistry C, 123 (51), pp. 31011-31025, 2019, ISSN: 1932-7447. Links | Tags: Foundry Inorganic @article{, title = {Bottom-Up Fabrication of a Metal-Supported Oxo-Metal Porphyrin}, author = {D A Duncan and P S Deimel and A Wiengarten and M Paszkiewicz and P C Aguilar and R G Acres and F Klappenberger and W Auwarter and A P Seitsonen and J V Barth and F Allegretti}, url = {<Go to ISI>://WOS:000505632900028}, doi = {10.1021/acs.jpcc.9b08661}, issn = {1932-7447}, year = {2019}, date = {2019-11-25}, journal = {Journal of Physical Chemistry C}, volume = {123}, number = {51}, pages = {31011-31025}, keywords = {Foundry Inorganic}, pubstate = {published}, tppubtype = {article} } |
| 54. | S Rieger, B J Bohn, M Doblinger, A F Richter, Y Tong, K Wang, P Muller-Buschbaum, L Polavarapu, L Leppert, J K Stolarczyk, J Feldmann Excitons and narrow bands determine the optical properties of cesium bismuth halides Journal Article Physical Review B, 100 (20), 2019, ISSN: 2469-9950. Links | Tags: Foundry Inorganic, Solid-Solid @article{, title = {Excitons and narrow bands determine the optical properties of cesium bismuth halides}, author = {S Rieger and B J Bohn and M Doblinger and A F Richter and Y Tong and K Wang and P Muller-Buschbaum and L Polavarapu and L Leppert and J K Stolarczyk and J Feldmann}, url = {<Go to ISI>://WOS:000498055800001}, doi = {10.1103/PhysRevB.100.201404}, issn = {2469-9950}, year = {2019}, date = {2019-11-20}, journal = {Physical Review B}, volume = {100}, number = {20}, keywords = {Foundry Inorganic, Solid-Solid}, pubstate = {published}, tppubtype = {article} } |
| 53. | M Kick, H Oberhofer Towards a transferable design of solid-state embedding models on the example of a rutile TiO2 (110) surface Journal Article Journal of Chemical Physics, 151 (18), 2019, ISSN: 0021-9606. Links | Tags: Molecularly-Functionalized, Solid-Liquid @article{, title = {Towards a transferable design of solid-state embedding models on the example of a rutile TiO2 (110) surface}, author = {M Kick and H Oberhofer}, url = {<Go to ISI>://WOS:000497760200011}, doi = {10.1063/1.5125204}, issn = {0021-9606}, year = {2019}, date = {2019-11-14}, journal = {Journal of Chemical Physics}, volume = {151}, number = {18}, keywords = {Molecularly-Functionalized, Solid-Liquid}, pubstate = {published}, tppubtype = {article} } |
| 52. | L Janker, Y Tong, L Polavarapu, J Feldmann, A S Urban, H J Krenner Real-Time Electron and Hole Transport Dynamics in Halide Perovskite Nanowires Journal Article Nano Letters, 19 (12), pp. 8701-8707, 2019, ISSN: 1530-6984. Links | Tags: Solid-Solid @article{, title = {Real-Time Electron and Hole Transport Dynamics in Halide Perovskite Nanowires}, author = {L Janker and Y Tong and L Polavarapu and J Feldmann and A S Urban and H J Krenner}, url = {<Go to ISI>://WOS:000502687500044}, doi = {10.1021/acs.nanolett.9b03396}, issn = {1530-6984}, year = {2019}, date = {2019-10-30}, journal = {Nano Letters}, volume = {19}, number = {12}, pages = {8701-8707}, keywords = {Solid-Solid}, pubstate = {published}, tppubtype = {article} } |
| 51. | D Bohm, M Beetz, M Schuster, K Peters, A G Hufnagel, M Doblinger, B Boller, T Bein, D Fattakhova-Rohlfing Advanced Functional Materials, 30 (1), 2019, ISSN: 1616-301X. Links | Tags: Foundry Inorganic @article{, title = {Efficient OER Catalyst with Low Ir Volume Density Obtained by Homogeneous Deposition of Iridium Oxide Nanoparticles on Macroporous Antimony-Doped Tin Oxide Support}, author = {D Bohm and M Beetz and M Schuster and K Peters and A G Hufnagel and M Doblinger and B Boller and T Bein and D Fattakhova-Rohlfing}, url = {<Go to ISI>://WOS:000492384200001}, doi = {10.1002/adfm.201906670}, issn = {1616-301X}, year = {2019}, date = {2019-10-25}, journal = {Advanced Functional Materials}, volume = {30}, number = {1}, keywords = {Foundry Inorganic}, pubstate = {published}, tppubtype = {article} } |
| 50. | K Koh, U Sanyal, M S Lee, G H Cheng, M Song, V A Glezakou, Y Liu, D S Li, R Rousseau, O Y Gutierrez, A Karkamkar, M Derewinski, J A Lercher Electrochemically Tunable Proton-Coupled Electron Transfer in Pd-Catalyzed Benzaldehyde Hydrogenation Journal Article Angewandte Chemie-International Edition, 59 (4), pp. 1501-1505, 2019, ISSN: 1433-7851. Links | Tags: Solid-Liquid @article{, title = {Electrochemically Tunable Proton-Coupled Electron Transfer in Pd-Catalyzed Benzaldehyde Hydrogenation}, author = {K Koh and U Sanyal and M S Lee and G H Cheng and M Song and V A Glezakou and Y Liu and D S Li and R Rousseau and O Y Gutierrez and A Karkamkar and M Derewinski and J A Lercher}, url = {<Go to ISI>://WOS:000502162100001}, doi = {10.1002/anie.201912241}, issn = {1433-7851}, year = {2019}, date = {2019-10-21}, journal = {Angewandte Chemie-International Edition}, volume = {59}, number = {4}, pages = {1501-1505}, keywords = {Solid-Liquid}, pubstate = {published}, tppubtype = {article} } |
| 49. | P Mao, C X Liu, Q Chen, M Han, S A Maier, S Zhang Broadband SERS detection with disordered plasmonic hybrid aggregates Journal Article Nanoscale, 12 (1), pp. 93-102, 2019, ISSN: 2040-3364. Links | Tags: Foundry Inorganic @article{, title = {Broadband SERS detection with disordered plasmonic hybrid aggregates}, author = {P Mao and C X Liu and Q Chen and M Han and S A Maier and S Zhang}, url = {<Go to ISI>://WOS:000504106900036}, doi = {10.1039/c9nr08118f}, issn = {2040-3364}, year = {2019}, date = {2019-10-14}, journal = {Nanoscale}, volume = {12}, number = {1}, pages = {93-102}, keywords = {Foundry Inorganic}, pubstate = {published}, tppubtype = {article} } |
| 48. | S E J Bell, G Charron, E Cortés, J Kneipp, De La M L Chapelle, J Langer, M Procházka, V Tran, S Schlücker Towards Reliable and Quantitative Surface-Enhanced Raman Scattering (SERS): From Key Parameters to Good Analytical Practice Journal Article Angewandte Chemie International Edition, 59 (14), pp. 5454-5462, 2019, ISSN: 1433-7851. Abstract | Links | Tags: Solid-Solid @article{, title = {Towards Reliable and Quantitative Surface-Enhanced Raman Scattering (SERS): From Key Parameters to Good Analytical Practice}, author = {S E J Bell and G Charron and E Cort\'{e}s and J Kneipp and De La M L Chapelle and J Langer and M Proch\'{a}zka and V Tran and S Schl\"{u}cker}, url = {https://onlinelibrary.wiley.com/doi/abs/10.1002/anie.201908154}, doi = {10.1002/anie.201908154}, issn = {1433-7851}, year = {2019}, date = {2019-10-07}, journal = {Angewandte Chemie International Edition}, volume = {59}, number = {14}, pages = {5454-5462}, abstract = {Abstract Experimental results obtained in different laboratories world-wide by researchers using surface-enhanced Raman scattering (SERS) can differ significantly. We, an international team of scientists with long-standing expertise in SERS, address this issue from our perspective by presenting considerations on reliable and quantitative SERS. The central idea of this joint effort is to highlight key parameters and pitfalls that are often encountered in the literature. To that end, we provide here a series of recommendations on: a) the characterization of solid and colloidal SERS substrates by correlative electron and optical microscopy and spectroscopy, b) on the determination of the SERS enhancement factor (EF), including suitable Raman reporter/probe molecules, and finally on c) good analytical practice. We hope that both newcomers and specialists will benefit from these recommendations to increase the inter-laboratory comparability of experimental SERS results and further establish SERS as an analytical tool.}, keywords = {Solid-Solid}, pubstate = {published}, tppubtype = {article} } Abstract Experimental results obtained in different laboratories world-wide by researchers using surface-enhanced Raman scattering (SERS) can differ significantly. We, an international team of scientists with long-standing expertise in SERS, address this issue from our perspective by presenting considerations on reliable and quantitative SERS. The central idea of this joint effort is to highlight key parameters and pitfalls that are often encountered in the literature. To that end, we provide here a series of recommendations on: a) the characterization of solid and colloidal SERS substrates by correlative electron and optical microscopy and spectroscopy, b) on the determination of the SERS enhancement factor (EF), including suitable Raman reporter/probe molecules, and finally on c) good analytical practice. We hope that both newcomers and specialists will benefit from these recommendations to increase the inter-laboratory comparability of experimental SERS results and further establish SERS as an analytical tool. |
| 47. | J Treu, X Xu, K Ott, K Saller, G Abstreiter, J J Finley, G Koblmüller Optical absorption of composition-tunable InGaAs nanowire arrays Journal Article Nanotechnology, 30 (49), pp. 495703, 2019, ISSN: 0957-4484 1361-6528. Abstract | Links | Tags: Foundry Inorganic, Molecularly-Functionalized @article{, title = {Optical absorption of composition-tunable InGaAs nanowire arrays}, author = {J Treu and X Xu and K Ott and K Saller and G Abstreiter and J J Finley and G Koblm\"{u}ller}, url = {http://dx.doi.org/10.1088/1361-6528/ab3ef7}, doi = {10.1088/1361-6528/ab3ef7}, issn = {0957-4484 1361-6528}, year = {2019}, date = {2019-09-20}, journal = {Nanotechnology}, volume = {30}, number = {49}, pages = {495703}, abstract = {InGaAs nanowire (NW) arrays have emerged as important active materials in future photovoltaic and photodetector applications, due to their excellent electronic properties and tunable band gap. Here, we report a systematic investigation of the optical absorption characteristics of composition-tunable vertical InGaAs NW arrays. Using finite-difference time-domain simulations we first study the effect of variable composition (Ga-molar fraction) and NW array geometry (NW diameter, period, fill factor) on the optical generation rate. NWs with typical diameters in the range of ∼100\textendash250 nm lead to generation rates higher than the equivalent bulk case for moderate fill factors (NW period of ∼0.3\textendash0.8 μm), while slightly smaller fill factors and increased diameters are required to maintain high generation rates at increased Ga-molar fraction. The optical absorption was further measured using spectrally resolved ultraviolet\textendashvisible-near-infrared (UV\textendashvis-NIR) spectroscopy on NW arrays transferred to transparent substrates. Interestingly, large variations in Ga-molar fraction (0 < x(Ga) < 0.5) have a negligible influence, while minute changes in NW diameter of less than ±20 nm affect the absorption spectra very strongly, leading to pronounced shifts in the peak absorption energies by more than ∼700 meV. These results clearly highlight the much larger sensitivity of the optical absorption behavior to geometric parameters rather than to variations in the electronic band gap of the underlying NW array.}, keywords = {Foundry Inorganic, Molecularly-Functionalized}, pubstate = {published}, tppubtype = {article} } InGaAs nanowire (NW) arrays have emerged as important active materials in future photovoltaic and photodetector applications, due to their excellent electronic properties and tunable band gap. Here, we report a systematic investigation of the optical absorption characteristics of composition-tunable vertical InGaAs NW arrays. Using finite-difference time-domain simulations we first study the effect of variable composition (Ga-molar fraction) and NW array geometry (NW diameter, period, fill factor) on the optical generation rate. NWs with typical diameters in the range of ∼100–250 nm lead to generation rates higher than the equivalent bulk case for moderate fill factors (NW period of ∼0.3–0.8 μm), while slightly smaller fill factors and increased diameters are required to maintain high generation rates at increased Ga-molar fraction. The optical absorption was further measured using spectrally resolved ultraviolet–visible-near-infrared (UV–vis-NIR) spectroscopy on NW arrays transferred to transparent substrates. Interestingly, large variations in Ga-molar fraction (0 < x(Ga) < 0.5) have a negligible influence, while minute changes in NW diameter of less than ±20 nm affect the absorption spectra very strongly, leading to pronounced shifts in the peak absorption energies by more than ∼700 meV. These results clearly highlight the much larger sensitivity of the optical absorption behavior to geometric parameters rather than to variations in the electronic band gap of the underlying NW array. |
| 46. | M Mallmann, R Niklaus, T Rackl, M Benz, T G Chau, D Johrendt, J Minár, W Schnick Chem. Eur. J., 25 , pp. 1-10, 2019, ISSN: 1521-3765. Abstract | Links | Tags: Foundry Inorganic @article{Mallmann2019, title = {Solid Solutions of Grimm\textendashSommerfeld Analogous Nitride Semiconductors II‐IV‐N2 (II=Mg, Mn, Zn; IV=Si, Ge): Ammonothermal Synthesis and DFT Calculations }, author = {M Mallmann and R Niklaus and T Rackl and M Benz and T G Chau and D Johrendt and J Min\'{a}r and W Schnick}, doi = {https://doi.org/10.1002/chem.201903897}, issn = {1521-3765}, year = {2019}, date = {2019-09-17}, journal = {Chem. Eur. J.}, volume = {25}, pages = {1-10}, abstract = {Grimm\textendashSommerfeld analogous II‐IV‐N2 nitrides such as ZnSiN2, ZnGeN2, and MgGeN2 are promising semiconductor materials for substitution of commonly used (Al,Ga,In)N. Herein, the ammonothermal synthesis of solid solutions of II‐IV‐N2 compounds (II=Mg, Mn, Zn; IV=Si, Ge) having the general formula (IIa1−xIIbx)‐IV‐N2 with x≈0.5 and ab initio DFT calculations of their electronic and optical properties are presented. The ammonothermal reactions were conducted in custom‐built, high‐temperature, high‐pressure autoclaves by using the corresponding elements as starting materials. NaNH2 and KNH2 act as ammonobasic mineralizers that increase the solubility of the reactants in supercritical ammonia. Temperatures between 870 and 1070 K and pressures up to 200 MPa were chosen as reaction conditions. All solid solutions crystallize in wurtzite‐type superstructures with space group Pna21 (no. 33), confirmed by powder XRD. The chemical compositions were analyzed by energy‐dispersive X‐ray spectroscopy. Diffuse reflectance spectroscopy was used for estimation of optical bandgaps of all compounds, which ranged from 2.6 to 3.5 eV (Ge compounds) and from 3.6 to 4.4 eV (Si compounds), and thus demonstrated bandgap tunability between the respective boundary phases. Experimental findings were corroborated by DFT calculations of the electronic structure of pseudorelaxed mixed‐occupancy structures by using the KKR+CPA approach.}, keywords = {Foundry Inorganic}, pubstate = {published}, tppubtype = {article} } Grimm–Sommerfeld analogous II‐IV‐N2 nitrides such as ZnSiN2, ZnGeN2, and MgGeN2 are promising semiconductor materials for substitution of commonly used (Al,Ga,In)N. Herein, the ammonothermal synthesis of solid solutions of II‐IV‐N2 compounds (II=Mg, Mn, Zn; IV=Si, Ge) having the general formula (IIa1−xIIbx)‐IV‐N2 with x≈0.5 and ab initio DFT calculations of their electronic and optical properties are presented. The ammonothermal reactions were conducted in custom‐built, high‐temperature, high‐pressure autoclaves by using the corresponding elements as starting materials. NaNH2 and KNH2 act as ammonobasic mineralizers that increase the solubility of the reactants in supercritical ammonia. Temperatures between 870 and 1070 K and pressures up to 200 MPa were chosen as reaction conditions. All solid solutions crystallize in wurtzite‐type superstructures with space group Pna21 (no. 33), confirmed by powder XRD. The chemical compositions were analyzed by energy‐dispersive X‐ray spectroscopy. Diffuse reflectance spectroscopy was used for estimation of optical bandgaps of all compounds, which ranged from 2.6 to 3.5 eV (Ge compounds) and from 3.6 to 4.4 eV (Si compounds), and thus demonstrated bandgap tunability between the respective boundary phases. Experimental findings were corroborated by DFT calculations of the electronic structure of pseudorelaxed mixed‐occupancy structures by using the KKR+CPA approach. |
| 45. | K Hübner, M Pilo-Pais, F Selbach, T Liedl, P Tinnefeld, F D Stefani, G P Acuna Directing Single-Molecule Emission with DNA Origami-Assembled Optical Antennas Journal Article Nano Letters, 19 (9), pp. 6629-6634, 2019, ISSN: 1530-6984. Links | Tags: Foundry Organic, Molecularly-Functionalized @article{, title = {Directing Single-Molecule Emission with DNA Origami-Assembled Optical Antennas}, author = {K H\"{u}bner and M Pilo-Pais and F Selbach and T Liedl and P Tinnefeld and F D Stefani and G P Acuna}, url = {https://doi.org/10.1021/acs.nanolett.9b02886}, doi = {10.1021/acs.nanolett.9b02886}, issn = {1530-6984}, year = {2019}, date = {2019-09-11}, journal = {Nano Letters}, volume = {19}, number = {9}, pages = {6629-6634}, keywords = {Foundry Organic, Molecularly-Functionalized}, pubstate = {published}, tppubtype = {article} } |
| 44. | J Langer, De D J Aberasturi, J Aizpurua, R A Alvarez-Puebla, B Auguie, J J Baumberg, G C Bazan, S E J Bell, A Boisen, A G Brolo, J Choo, D Cialla-May, V Deckert, L Fabris, K Faulds, De F J G Abajo, R Goodacre, D Graham, A J Haes, C L Haynes, C Huck, T Itoh, M Ka, J Kneipp, N A Kotov, H Kuang, Le E C Ru, H K Lee, J F Li, X Y Ling, S A Maier, T Mayerhofer, M Moskovits, K Murakoshi, J M Nam, S Nie, Y Ozaki, I Pastoriza-Santos, J Perez-Juste, J Popp, A Pucci, S Reich, B Ren, G C Schatz, T Shegai, S Schlucker, L L Tay, K G Thomas, Z Q Tian, Van R P Duyne, T Vo-Dinh, Y Wang, K A Willets, C Xu, H Xu, Y Xu, Y S Yamamoto, B Zhao, L M Liz-Marzan Present and Future of Surface-Enhanced Raman Scattering Journal Article Acs Nano, 14 (1), pp. 28-117, 2019, ISSN: 1936-0851. Links | Tags: Foundry Inorganic @article{, title = {Present and Future of Surface-Enhanced Raman Scattering}, author = {J Langer and De D J Aberasturi and J Aizpurua and R A Alvarez-Puebla and B Auguie and J J Baumberg and G C Bazan and S E J Bell and A Boisen and A G Brolo and J Choo and D Cialla-May and V Deckert and L Fabris and K Faulds and De F J G Abajo and R Goodacre and D Graham and A J Haes and C L Haynes and C Huck and T Itoh and M Ka and J Kneipp and N A Kotov and H Kuang and Le E C Ru and H K Lee and J F Li and X Y Ling and S A Maier and T Mayerhofer and M Moskovits and K Murakoshi and J M Nam and S Nie and Y Ozaki and I Pastoriza-Santos and J Perez-Juste and J Popp and A Pucci and S Reich and B Ren and G C Schatz and T Shegai and S Schlucker and L L Tay and K G Thomas and Z Q Tian and Van R P Duyne and T Vo-Dinh and Y Wang and K A Willets and C Xu and H Xu and Y Xu and Y S Yamamoto and B Zhao and L M Liz-Marzan}, url = {<Go to ISI>://WOS:000510531500006}, doi = {10.1021/acsnano.9b04224}, issn = {1936-0851}, year = {2019}, date = {2019-09-03}, journal = {Acs Nano}, volume = {14}, number = {1}, pages = {28-117}, keywords = {Foundry Inorganic}, pubstate = {published}, tppubtype = {article} } |
| 43. | S Watzele, P Hauenstein, Y C Liang, S Xue, J Fichtner, B Garlyyev, D Scieszka, F Claude, F Maillard, A S Bandarenka Determination of Electroactive Surface Area of Ni-, Co-, Fe-, and Ir-Based Oxide Electrocatalysts Journal Article Acs Catalysis, 9 (10), pp. 9222-9230, 2019, ISSN: 2155-5435. Links | Tags: Solid-Liquid @article{, title = {Determination of Electroactive Surface Area of Ni-, Co-, Fe-, and Ir-Based Oxide Electrocatalysts}, author = {S Watzele and P Hauenstein and Y C Liang and S Xue and J Fichtner and B Garlyyev and D Scieszka and F Claude and F Maillard and A S Bandarenka}, url = {<Go to ISI>://WOS:000489204000043}, doi = {10.1021/acscatal.9b02006}, issn = {2155-5435}, year = {2019}, date = {2019-08-30}, journal = {Acs Catalysis}, volume = {9}, number = {10}, pages = {9222-9230}, keywords = {Solid-Liquid}, pubstate = {published}, tppubtype = {article} } |
| 42. | B S Wei, D C Zhang, Y H Chen, A W Lei, P Knochel Preparation of Polyfunctional Biaryl Derivatives by Cyclolanthanation of 2-Bromobiaryls and Heterocyclic Analogues Using nBu(2)LaCl.4 LiCl Journal Article Angewandte Chemie-International Edition, 58 (44), pp. 15631-15635, 2019, ISSN: 1433-7851. Links | Tags: Foundry Organic @article{, title = {Preparation of Polyfunctional Biaryl Derivatives by Cyclolanthanation of 2-Bromobiaryls and Heterocyclic Analogues Using nBu(2)LaCl.4 LiCl}, author = {B S Wei and D C Zhang and Y H Chen and A W Lei and P Knochel}, url = {<Go to ISI>://WOS:000487102700001}, doi = {10.1002/anie.201908046}, issn = {1433-7851}, year = {2019}, date = {2019-08-28}, journal = {Angewandte Chemie-International Edition}, volume = {58}, number = {44}, pages = {15631-15635}, keywords = {Foundry Organic}, pubstate = {published}, tppubtype = {article} } |
| 41. | G Grinblat, I Abdelwahab, M P Nielsen, P Dichtl, K Leng, R F Oulton, K P Loh, S A Maier Ultrafast All-Optical Modulation in 2D Hybrid Perovskites Journal Article ACS Nano, 13 (8), pp. 9504-9510, 2019, ISSN: 1936-0851. Links | Tags: Solid-Solid @article{, title = {Ultrafast All-Optical Modulation in 2D Hybrid Perovskites}, author = {G Grinblat and I Abdelwahab and M P Nielsen and P Dichtl and K Leng and R F Oulton and K P Loh and S A Maier}, url = {https://doi.org/10.1021/acsnano.9b04483}, doi = {10.1021/acsnano.9b04483}, issn = {1936-0851}, year = {2019}, date = {2019-08-27}, journal = {ACS Nano}, volume = {13}, number = {8}, pages = {9504-9510}, keywords = {Solid-Solid}, pubstate = {published}, tppubtype = {article} } |
| 40. | C A Walenta, M Tschurl, U Heiz Introducing catalysis in photocatalysis: What can be understood from surface science studies of alcohol photoreforming on TiO2 Journal Article Journal of Physics-Condensed Matter, 31 (47), 2019, ISSN: 0953-8984. Links | Tags: Solid-Liquid @article{, title = {Introducing catalysis in photocatalysis: What can be understood from surface science studies of alcohol photoreforming on TiO2}, author = {C A Walenta and M Tschurl and U Heiz}, url = {<Go to ISI>://WOS:000482603900001}, doi = {10.1088/1361-648X/ab351a}, issn = {0953-8984}, year = {2019}, date = {2019-08-23}, journal = {Journal of Physics-Condensed Matter}, volume = {31}, number = {47}, keywords = {Solid-Liquid}, pubstate = {published}, tppubtype = {article} } |
| 39. | L Polavarapu, H Huang, Y Li, Y Tong, E-P Yao, M Döblinger, M W Feil, A F Richter, A L Rogach, J Feldmann Spontaneous Crystallization of Perovskite Nanocrystals in Nonpolar Organic Solvents: A Versatile Approach for their Shape-controlled Synthesis Journal Article Angewandte Chemie International Edition, 0 (ja), 2019, ISSN: 1433-7851. Abstract | Links | Tags: Solid-Solid @article{, title = {Spontaneous Crystallization of Perovskite Nanocrystals in Nonpolar Organic Solvents: A Versatile Approach for their Shape-controlled Synthesis}, author = {L Polavarapu and H Huang and Y Li and Y Tong and E-P Yao and M D\"{o}blinger and M W Feil and A F Richter and A L Rogach and J Feldmann}, url = {https://doi.org/10.1002/anie.201906862}, doi = {10.1002/anie.201906862}, issn = {1433-7851}, year = {2019}, date = {2019-08-21}, journal = {Angewandte Chemie International Edition}, volume = {0}, number = {ja}, abstract = {The growing demand of perovskite nanocrystals (NCs) for various applications has stimulated great research interest in the development of facile synthetic methods. They have often been synthesized by either ligand assisted reprecipitation (LARP) at room temperature or by hot-injection at high temperatures and inert atmosphere. However, the use of polar solvents in LARP effects their stability. Herein, we report on the spontaneous crystallization of perovskite nanocrystals in nonpolar organic media at ambient conditions by simple mixing of precursor-ligand complexes without applying any external stimuli. The shape of the NCs can be controlled from nanocubes to nanoplatelets by varying the ratio of monovalent (e.g. formamidinium+ (FA+) and Cs+) to divalent (Pb2+) cation-ligand complexes. The precursor-ligand complexes are stable for months, and thus perovskite NCs can be readily prepared prior to use. Moreover, we show that this versatile synthetic process is scalable and can be generally applicable for perovskite NCs of different compositions.}, keywords = {Solid-Solid}, pubstate = {published}, tppubtype = {article} } The growing demand of perovskite nanocrystals (NCs) for various applications has stimulated great research interest in the development of facile synthetic methods. They have often been synthesized by either ligand assisted reprecipitation (LARP) at room temperature or by hot-injection at high temperatures and inert atmosphere. However, the use of polar solvents in LARP effects their stability. Herein, we report on the spontaneous crystallization of perovskite nanocrystals in nonpolar organic media at ambient conditions by simple mixing of precursor-ligand complexes without applying any external stimuli. The shape of the NCs can be controlled from nanocubes to nanoplatelets by varying the ratio of monovalent (e.g. formamidinium+ (FA+) and Cs+) to divalent (Pb2+) cation-ligand complexes. The precursor-ligand complexes are stable for months, and thus perovskite NCs can be readily prepared prior to use. Moreover, we show that this versatile synthetic process is scalable and can be generally applicable for perovskite NCs of different compositions. |
| 38. | J Gargiulo, R Berté, Y Li, S A Maier, E Cortés From Optical to Chemical Hot Spots in Plasmonics Journal Article Accounts of Chemical Research, 2019, ISSN: 0001-4842. Links | Tags: Molecularly-Functionalized @article{, title = {From Optical to Chemical Hot Spots in Plasmonics}, author = {J Gargiulo and R Bert\'{e} and Y Li and S A Maier and E Cort\'{e}s}, url = {https://doi.org/10.1021/acs.accounts.9b00234}, doi = {10.1021/acs.accounts.9b00234}, issn = {0001-4842}, year = {2019}, date = {2019-08-20}, journal = {Accounts of Chemical Research}, keywords = {Molecularly-Functionalized}, pubstate = {published}, tppubtype = {article} } |
| 37. | P Marzak, P Moser, S Schreier, D Scieszka, J Yun, O Schneider, A S Bandarenka A Cell for Controllable Formation and In Operando Electrochemical Characterization of Intercalation Materials for Aqueous Metal-Ion Batteries Journal Article Small Methods, 2019, ISSN: 2366-9608. Links | Tags: Solid-Liquid @article{, title = {A Cell for Controllable Formation and In Operando Electrochemical Characterization of Intercalation Materials for Aqueous Metal-Ion Batteries}, author = {P Marzak and P Moser and S Schreier and D Scieszka and J Yun and O Schneider and A S Bandarenka}, url = {<Go to ISI>://WOS:000481312300001}, doi = {10.1002/smtd.201900445}, issn = {2366-9608}, year = {2019}, date = {2019-08-16}, journal = {Small Methods}, keywords = {Solid-Liquid}, pubstate = {published}, tppubtype = {article} } |
| 36. | S D Gennaro, Y Li, S A Maier, R F Oulton Nonlinear Pancharatnam−Berry Phase Metasurfaces beyond the Dipole Approximation Journal Article ACS Photonics, 2019. Links | Tags: Solid-Solid @article{, title = {Nonlinear Pancharatnam−Berry Phase Metasurfaces beyond the Dipole Approximation}, author = {S D Gennaro and Y Li and S A Maier and R F Oulton}, url = {https://doi.org/10.1021/acsphotonics.9b00877}, doi = {10.1021/acsphotonics.9b00877}, year = {2019}, date = {2019-08-12}, journal = {ACS Photonics}, keywords = {Solid-Solid}, pubstate = {published}, tppubtype = {article} } |
Publications2020-08-21T17:11:33+02:00