Publikationen

@article{,

title = {On-site tuning of the carrier lifetime in silicon for on-chip THz circuits using a focused beam of helium ions},

author = {P Zimmermann and A W Holleitner},

url = {https://doi.org/10.1063/1.5143421},

doi = {10.1063/1.5143421},

issn = {0003-6951},

year  = {2020},

date = {2020-02-18},

journal = {Applied Physics Letters},

volume = {116},

number = {7},

pages = {073501},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@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 = {},

pubstate = {published},

tppubtype = {article}

}

@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 = {},

pubstate = {published},

tppubtype = {article}

}

@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 = {},

pubstate = {published},

tppubtype = {article}

}

@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},

urldate = {2020-02-14},

journal = {The Journal of Physical Chemistry Letters},

volume = {11},

pages = {1773-1780},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@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},

urldate = {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 = {},

pubstate = {published},

tppubtype = {article}

}

@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 = {},

pubstate = {published},

tppubtype = {article}

}

@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 = {},

pubstate = {published},

tppubtype = {article}

}

@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 = {},

pubstate = {published},

tppubtype = {article}

}

@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 = {},

pubstate = {published},

tppubtype = {article}

}

@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 = {},

pubstate = {published},

tppubtype = {article}

}

@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 = {},

pubstate = {published},

tppubtype = {article}

}

@article{nokey,

title = {Operando Identification of Liquid Intermediates in Lithium\textendashSulfur Batteries via Transmission UV\textendashvis Spectroscopy},

author = {Q He and A T S Freiberg and M U M Patel and S Qian and H A Gasteiger},

url = {http://dx.doi.org/10.1149/1945-7111/ab8645},

doi = {10.1149/1945-7111/ab8645},

issn = {0013-4651 1945-7111},

year  = {2020},

date = {2020-01-05},

urldate = {2020-01-05},

journal = {Journal of The Electrochemical Society},

volume = {167},

number = {8},

pages = {080508},

abstract = {Lithium-sulfur (Li-S) batteries are facing various challenges with regards to performance and durability, and further improvements require a better understanding of the fundamental working mechanisms, including an identification of the reaction intermediates in an operating Li-S battery. In this study, we present an operando transmission UV\textendashvis spectro-electrochemical cell design that employs a conventional sulfur/carbon composite electrode, propose a comprehensive peak assignment for polysulfides in DOL:DME-based electrolyte, and finally identify the liquid intermediates in the discharging process of an operating Li-S cell. Here, we propose for the first time a meta-stable polysulfide species (S32−) that is present at substantial concentrations during the 2nd discharge plateau in a Li-S battery. We identify the S32− species that are the reduction product of S42−, as deducted from the analysis of the obtained operando UV\textendashvis spectra along with the transferred charge, and confirmed by rotating ring disk electrode measurements for the reduction of a solution with a nominal Li2S4 stoichiometry. Furthermore, our operando results provide insight into the potential-dependent stability of different S-species and the rate-limiting (electro)chemical steps during discharging. Finally, we propose a viable reaction pathway of how S8 is electrochemically reduced to Li2S2/Li2S based on our operando results as well as that reported in the literature.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{nokey,

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 E Alarc\'{o}n-Llad\'{o} and G Richter and F Haase and A Fontcuberta I Morral and C Scheu and B V Lotsch},

url = {https://doi.org/10.1038/s41929-019-0400-x},

doi = {10.1038/s41929-019-0400-x},

issn = {2520-1158},

year  = {2020},

date = {2020-01-01},

journal = {Nature Catalysis},

volume = {3},

number = {1},

pages = {55-63},

abstract = {The rational design of hydrogen evolution reaction electrocatalysts that can compete with platinum is an outstanding challenge in the process of designing viable power-to-gas technologies. Here, we introduce delafossites as a family of hydrogen evolution reaction electrocatalysts in acidic media. We show that, in PdCoO2, the inherently strained Pd metal sublattice acts as a pseudomorphic template for the growth of a tensile-strained Pd-rich capping layer under reductive conditions. The surface modification ranges up to 400 nm and continuously improves the electrocatalytic activity by simultaneously increasing the exchange current density and by reducing the Tafel slope down to 38 mV dec−1, leading to overpotentials η10 \< 15 mV. The improved activity is attributed to the operando stabilization of a β-PdHx phase with enhanced surface catalytic properties with respect to pure or nanostructured palladium. These findings illustrate how operando-induced electrodissolution can be used as a top-down design concept through the strain-stabilized formation of catalytically active phases.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{nokey,

title = {Scalable single-photon sources in atomically thin MoS2},

author = {J Klein and L Sigl and A H\"{o}tger and S Gyger and K Barthelmi and M Florian and A Kerelsky and E Mitterreiter and C Kastl and S Rey and T Taniguchi and K Watanabe and F Jahnke and V Zwiller and K J\"{o}ns and A Pasupathy and F Ross and K M\"{u}ller and U Wurstbauer and J J Finley and A W Holleitner},

url = {https://doi.org/10.1117/12.2570472},

doi = {10.1117/12.2570472},

year  = {2020},

date = {2020-01-01},

urldate = {2020-01-01},

volume = {11471},

publisher = {SPIE},

series = {SPIE Nanoscience + Engineering},

abstract = {2D materials offer a wide range of perspectives for hosting highly localized 0D states, e.g. vacancy defects, that offer great potential for integrated quantum photonic applications. Here, we create individual defects that act as our single-photon emitters by highly local He-ion irradiation in a monolayer MoS2 van der Waals heterostructure. The defects show anti-bunched light emission at a characteristic energy of ~ 1.75 eV. The emission is highly homogeneous and background free due to the hBN encapsulation with a creation yield of \> 70%. Spectroscopic investigation of individual single-photon emitters reveals a strongly asymmetric line shape resembling interaction with acoustic phonons in excellent agreement with an independent boson model. Moreover, emitters are spatially integrated and electrically controlled in field-switchable van der Waals devices. Our work firmly establishes 2D materials as a highly scalable material platform for integrated quantum photonics.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{nokey,

title = {Manipulation and statistical analysis of the fluid flow of polymer semiconductor solutions during meniscus-guided coating},

author = {L Shaw and Y Diao and G C Martin-Noble and H Yan and P Hayoz and R T Weitz and D Kaelblein and M F Toney and Z Bao},

url = {https://www.cambridge.org/core/article/manipulation-and-statistical-analysis-of-the-fluid-flow-of-polymer-semiconductor-solutions-during-meniscusguided-coating/B89C6C7985E43178910D8DAA53FF77C3},

doi = {10.1557/mrs.2020.306},

issn = {0883-7694},

year  = {2020},

date = {2020-01-01},

journal = {MRS Bulletin},

pages = {1-14},

abstract = {Recent work in structure\textendashprocessing relationships of polymer semiconductors have demonstrated the versatility and control of thin-film microstructure offered by meniscus-guided coating (MGC) techniques. Here, we analyze the qualitative and quantitative aspects of solution shearing, a model MGC method, using coating blades augmented with arrays of pillars. The pillars induce local regions of high strain rates\textemdashboth shear and extensional\textemdashnot otherwise possible with unmodified blades, and we use fluid mechanical simulations to model and study a variety of pillar spacings and densities. We then perform a statistical analysis of 130 simulation variables to find correlations with three dependent variables of interest: thin-film degree of crystallinity and transistor field-effect mobilities for charge-transport parallel (μpara) and perpendicular (μperp) to the coating direction. Our study suggests that simple fluid mechanical models can reproduce substantive correlations between the induced fluid flow and important performance metrics, providing a methodology for optimizing blade design.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{nokey,

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 E Alarc\'{o}n-Llad\'{o} and G Richter and F Haase and A Fontcuberta I Morral and C Scheu and B V Lotsch},

url = {https://doi.org/10.1038/s41929-019-0400-x},

doi = {10.1038/s41929-019-0400-x},

issn = {2520-1158},

year  = {2020},

date = {2020-01-01},

journal = {Nature Catalysis},

volume = {3},

number = {1},

pages = {55-63},

abstract = {The rational design of hydrogen evolution reaction electrocatalysts that can compete with platinum is an outstanding challenge in the process of designing viable power-to-gas technologies. Here, we introduce delafossites as a family of hydrogen evolution reaction electrocatalysts in acidic media. We show that, in PdCoO2, the inherently strained Pd metal sublattice acts as a pseudomorphic template for the growth of a tensile-strained Pd-rich capping layer under reductive conditions. The surface modification ranges up to 400 nm and continuously improves the electrocatalytic activity by simultaneously increasing the exchange current density and by reducing the Tafel slope down to 38 mV dec−1, leading to overpotentials η10 \< 15 mV. The improved activity is attributed to the operando stabilization of a β-PdHx phase with enhanced surface catalytic properties with respect to pure or nanostructured palladium. These findings illustrate how operando-induced electrodissolution can be used as a top-down design concept through the strain-stabilized formation of catalytically active phases.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@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 = {},

pubstate = {published},

tppubtype = {article}

}

@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 = {},

pubstate = {published},

tppubtype = {article}

}

@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 = {},

pubstate = {published},

tppubtype = {article}

}

@article{,

title = {Facile Synthesis of FAPbI3 Nanorods},

author = {H Huang and L Wu and Y Wang and A F Richter and M D\"{o}blinger and J Feldmann},

url = {https://www.mdpi.com/2079-4991/10/1/72},

issn = {2079-4991},

year  = {2019},

date = {2019-12-29},

journal = {Nanomaterials},

volume = {10},

number = {1},

pages = {72},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@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 = {},

pubstate = {published},

tppubtype = {article}

}

@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 = {},

pubstate = {published},

tppubtype = {article}

}

@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 = {},

pubstate = {published},

tppubtype = {article}

}

@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 = {},

pubstate = {published},

tppubtype = {article}

}

@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 = {},

pubstate = {published},

tppubtype = {article}

}

@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 = {},

pubstate = {published},

tppubtype = {article}

}

@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 = {},

pubstate = {published},

tppubtype = {article}

}

@article{nokey,

title = {From DNA Tiles to Functional DNA Materials},

author = {A Heuer-Jungemann and T Liedl},

url = {https://www.sciencedirect.com/science/article/pii/S258959741930190X},

doi = {https://doi.org/10.1016/j.trechm.2019.07.006},

issn = {2589-5974},

year  = {2019},

date = {2019-12-01},

journal = {Trends in Chemistry},

volume = {1},

number = {9},

pages = {799-814},

abstract = {Over the past few decades, DNA has turned into one of the most widely used molecular linkers and a versatile building block for the self-assembly of DNA nanostructures. Such complexes, composed of only a few oligonucleotides (e.g., DNA tiles) or assembled from hundreds of synthetic and natural scaffolding strands (e.g., DNA origami), are being increasingly assembled into higher-order architectures such as lattices and crystals. A wide variety of assembly methods and techniques (e.g., solution-phase and substrate-assisted sticky-ended cohesion or blunt-end stacking) have emerged and are constantly being refined. This review provides a summary of the methods and building blocks for the assembly of 2D and 3D DNA lattices and crystals, and discusses some of their potential applications in materials science.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@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 = {},

pubstate = {published},

tppubtype = {article}

}

@article{nokey,

title = {Nonadiabatic Molecular Dynamics on Graphics Processing Units: Performance and Application to Rotary Molecular Motors},

author = {L D M Peters and J Kussmann and C Ochsenfeld},

url = {https://doi.org/10.1021/acs.jctc.9b00859},

doi = {10.1021/acs.jctc.9b00859},

issn = {1549-9618},

year  = {2019},

date = {2019-11-25},

journal = {Journal of Chemical Theory and Computation},

volume = {15},

number = {12},

pages = {6647-6659},

abstract = {Nonadiabatic molecular dynamics (NAMD) simulations of molecular systems require the efficient evaluation of excited-state properties, such as energies, gradients, and nonadiabatic coupling vectors. Here, we investigate the use of graphics processing units (GPUs) in addition to central processing units (CPUs) to efficiently calculate these properties at the time-dependent density functional theory (TDDFT) level of theory. Our implementation in the FermiONs++ program package uses the J-engine and a preselective screening procedure for the calculation of Coulomb and exchange kernels, respectively. We observe good speed-ups for small and large molecular systems (comparable to those observed in ground-state calculations) and reduced (down to sublinear) scaling behavior with respect to the system size (depending on the spatial locality of the investigated excitation). As a first illustrative application, we present efficient NAMD simulations of a series of newly designed light-driven rotary molecular motors and compare their S1 lifetimes. Although all four rotors show different S1 excitation energies, their ability to rotate upon excitation is conserved, making the series an interesting starting point for rotary molecular motors with tunable excitation energies.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@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 = {},

pubstate = {published},

tppubtype = {article}

}

@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 = {},

pubstate = {published},

tppubtype = {article}

}

@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 = {},

pubstate = {published},

tppubtype = {article}

}

@article{nokey,

title = {Effect of Solvent Additives on the Morphology and Device Performance of Printed Nonfullerene Acceptor Based Organic Solar Cells},

author = {K S Wienhold and V K\"{o}rstgens and S Grott and X Jiang and M Schwartzkopf and S V Roth and P M\"{u}ller-Buschbaum},

url = {https://doi.org/10.1021/acsami.9b16784},

doi = {10.1021/acsami.9b16784},

issn = {1944-8244},

year  = {2019},

date = {2019-11-13},

journal = {ACS Applied Materials \& Interfaces},

volume = {11},

number = {45},

pages = {42313-42321},

abstract = {Printing of active layers of high-efficiency organic solar cells and morphology control by processing with varying solvent additive concentrations are important to realize real-world use of bulk-heterojunction photovoltaics as it enables both up-scaling and optimization of the device performance. In this work, active layers of the conjugated polymer with benzodithiophene units PBDB-T-SF and the nonfullerene small molecule acceptor IT-4F are printed using meniscus guided slot-die coating. 1,8-Diiodooctane (DIO) is added to optimize the power conversion efficiency (PCE). The effect on the inner nanostructure and surface morphology of the material is studied for different solvent additive concentrations with grazing incidence small-angle X-ray scattering (GISAXS), grazing incidence wide-angle X-ray scattering (GIWAXS), scanning electron microscopy (SEM), and atomic force microscopy (AFM). Optical properties are studied with photoluminescence (PL), UV/vis absorption spectroscopy, and external quantum efficiency (EQE) measurements and correlated to the corresponding PCEs. The addition of 0.25 vol % DIO enhances the average PCE from 3.5 to 7.9%, whereas at higher concentrations the positive effect is less pronounced. A solar cell performance of 8.95% is obtained for the best printed device processed with an optimum solvent additive concentration. Thus, with the large-scale preparation method printing similarly well working solar cells can be realized as with the spin-coating method.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{nokey,

title = {Dibenzochrysene enables tightly controlled docking and stabilizes photoexcited states in dual-pore covalent organic frameworks},

author = {N Keller and T Sick and N N Bach and A Koszalkowski and J M Rotter and D D Medina and T Bein},

url = {http://dx.doi.org/10.1039/C9NR08007D},

doi = {10.1039/C9NR08007D},

issn = {2040-3364},

year  = {2019},

date = {2019-11-08},

urldate = {2019-11-08},

journal = {Nanoscale},

volume = {11},

number = {48},

pages = {23338-23345},

abstract = {Covalent organic frameworks (COFs), consisting of covalently connected organic building units, combine attractive features such as crystallinity, open porosity and widely tunable physical properties. For optoelectronic applications, the incorporation of heteroatoms into a 2D COF has the potential to yield desired photophysical properties such as lower band gaps, but can also cause lateral offsets of adjacent layers. Here, we introduce dibenzo[g,p]chrysene (DBC) as a novel building block for the synthesis of highly crystalline and porous 2D dual-pore COFs showing interesting properties for optoelectronic applications. The newly synthesized terephthalaldehyde (TA), biphenyl (Biph), and thienothiophene (TT) DBC-COFs combine conjugation in the a,b-plane with a tight packing of adjacent layers guided through the molecular DBC node serving as specific docking site for successive layers. The resulting DBC-COFs exhibit a hexagonal dual-pore kagome geometry, which is comparable to COFs containing another molecular docking site, namely 4,4′,4′′,4′′′-(ethylene-1,1,2,2-tetrayl)-tetraaniline (ETTA). In this context, the respective interlayer distances decrease from about 4.6 r{A} in ETTA-COFs to about 3.6 r{A} in DBC-COFs, leading to well-defined hexagonally faceted single crystals sized about 50\textendash100 nm. The TT DBC-COF features broad light absorption covering large parts of the visible spectrum, while Biph DBC-COF shows extraordinary excited state lifetimes exceeding 10 ns. In combination with the large number of recently developed linear conjugated building blocks, the new DBC tetra-connected node is expected to enable the synthesis of a large family of highly correlated and ordered 2D COFs with promising optoelectronic properties.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@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 = {},

pubstate = {published},

tppubtype = {article}

}

@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 = {},

pubstate = {published},

tppubtype = {article}

}

@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 = {},

pubstate = {published},

tppubtype = {article}

}

@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 = {},

pubstate = {published},

tppubtype = {article}

}

@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},

urldate = {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 = {},

pubstate = {published},

tppubtype = {article}

}

@article{nokey,

title = {Covalent Organic Framework Films through Electrophoretic Deposition\textemdashCreating Efficient Morphologies for Catalysis},

author = {J M Rotter and S Weinberger and J Kampmann and T Sick and M Shalom and T Bein and D D Medina},

url = {https://doi.org/10.1021/acs.chemmater.9b02286},

doi = {10.1021/acs.chemmater.9b02286},

issn = {0897-4756},

year  = {2019},

date = {2019-10-03},

urldate = {2019-10-03},

journal = {Chemistry of Materials},

volume = {31},

number = {24},

pages = {10008-10016},

abstract = {The ability to grow covalent organic framework (COF) films allows for studying their properties as solid layers and enables the incorporation of these materials into a variety of functional devices. Here, we report on the fabrication of COF films and coatings by electrophoretic deposition (EPD). We demonstrate that the EPD technique is suitable for depositing COFs featuring two- and three-dimensional structures linked by imine or boronate ester bonds, namely, BDT-ETTA COF, COF-300, and COF-5. For the deposition, COF nanoparticle suspensions are prepared by dispersing the as-synthesized bulk materials in solvents with low dielectric constants. Subsequently, two electrodes are immersed into the COF particle suspensions, and upon inducing electric fields ranging from 100 to 900 V cm\textendash1, COFs are deposited as films on the positively charged electrode. Through EPD, within 2 min, large-area films of up to 25 cm2 are obtained on smooth or corrugated surfaces. COF films prepared by EPD feature an inherent textural porosity and tunable thickness, demonstrated from 400 nm to 24 μm. By controlling the deposition parameters such as duration, particle concentration, and applied potential, deposits of precise thickness can be produced. Furthermore, codepositions of different COFs as well as COF/Pt nanoparticles from mixed suspensions are demonstrated. The film morphologies obtained by EPD are shown to be advantageous for catalysis, as demonstrated for sacrificial agent-free photoelectrochemical water reduction. Here, BDT-ETTA COF photocathodes show a strongly increased photocurrent density compared to the respective dense and oriented films. Typical BDT-ETTA COF/Pt nanoparticle hybrid films exhibit photocurrent densities of over 100 μA cm\textendash2. The rapid and scalable deposition of COF particles as films and coatings through EPD is a versatile addition to the toolbox of COF film fabrication techniques, allowing for tailoring COF film architectures for desired functionalities.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{,

title = {Anisotropic Strain-Induced Soliton Movement Changes Stacking Order and Band Structure of Graphene Multilayers: Implications for Charge Transport},

author = {F R Geisenhof and F Winterer and S Wakolbinger and T D Gokus and Y C Durmaz and D Priesack and J Lenz and F Keilmann and K Watanabe and T Taniguchi and R Guerrero-Avil\'{e}s and M Pelc and A Ayuela and R T Weitz},

url = {https://doi.org/10.1021/acsanm.9b01603},

doi = {10.1021/acsanm.9b01603},

year  = {2019},

date = {2019-09-27},

urldate = {2019-09-27},

journal = {ACS Applied Nano Materials},

volume = {2},

number = {9},

pages = {6067-6075},

abstract = {The crystal structure of solid-state matter greatly affects its electronic properties. For example, in multilayer graphene, precise knowledge of the lateral layer arrangement is crucial, since the most stable configurations, Bernal and rhombohedral stacking, exhibit very different electronic properties. Nevertheless, both stacking orders can coexist within one flake, separated by a strain soliton that can host topologically protected states. Clearly, accessing the transport properties of the two stackings and the soliton is of high interest. However, the stacking orders can transform into one another, and therefore, the seemingly trivial question of how reliable electrical contact can be made to either stacking order can a priori not be answered easily. Here, we show that manufacturing metal contacts to multilayer graphene can move solitons by several μm, unidirectionally enlarging Bernal domains due to arising mechanical strain. Furthermore, we also find that during dry transfer of multilayer graphene onto hexagonal boron nitride, such a transformation can happen. Using density functional theory modeling, we corroborate that anisotropic deformations of the multilayer graphene lattice decrease the rhombohedral stacking stability. Finally, we have devised systematics to avoid soliton movement, and how to reliably realize contacts to both stacking configurations, which will aid to reliably access charge transport in both stacking configurations.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@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 = {},

pubstate = {published},

tppubtype = {article}

}

@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 = {},

pubstate = {published},

tppubtype = {article}

}

@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},

urldate = {2019-09-11},

journal = {Nano Letters},

volume = {19},

number = {9},

pages = {6629-6634},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{nokey,

title = {A highly crystalline anthracene-based MOF-74 series featuring electrical conductivity and luminescence},

author = {P I Scheurle and A M\"{a}hringer and A C Jakowetz and P Hosseini and A F Richter and G Wittstock and D D Medina and T Bein},

url = {http://dx.doi.org/10.1039/C9NR05431F},

doi = {10.1039/C9NR05431F},

issn = {2040-3364},

year  = {2019},

date = {2019-09-10},

journal = {Nanoscale},

volume = {11},

number = {43},

pages = {20949-20955},

abstract = {Recently, a small group of metal\textendashorganic frameworks (MOFs) has been discovered featuring substantial charge transport properties and electrical conductivity, hence promising to broaden the scope of potential MOF applications in fields such as batteries, fuel cells and supercapacitors. In combination with light emission, electroactive MOFs are intriguing candidates for chemical sensing and optoelectronic applications. Here, we incorporated anthracene-based building blocks into the MOF-74 topology with five different divalent metal ions, that is, Zn2+, Mg2+, Ni2+, Co2+ and Mn2+, resulting in a series of highly crystalline MOFs, coined ANMOF-74(M). This series of MOFs features substantial photoluminescence, with ANMOF-74(Zn) emitting across the whole visible spectrum. The materials moreover combine this photoluminescence with high surface areas and electrical conductivity. Compared to the original MOF-74 materials constructed from 2,5-dihydroxy terephthalic acid and the same metal ions Zn2+, Mg2+, Ni2+, Co2+ and Mn2+, we observed a conductivity enhancement of up to six orders of magnitude. Our results point towards the importance of building block design and the careful choice of the embedded MOF topology for obtaining materials with desired properties such as photoluminescence and electrical conductivity.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{nokey,

title = {In Situ Monitoring Mesoscopic Deformation of Nanostructured Porous Titania Films Caused by Water Ingression},

author = {L Song and M Rawolle and N Hohn and J S Gutmann and H Frielinghaus and P M\"{u}ller-Buschbaum},

url = {https://doi.org/10.1021/acsami.9b10750},

doi = {10.1021/acsami.9b10750},

issn = {1944-8244},

year  = {2019},

date = {2019-09-04},

journal = {ACS Applied Materials \& Interfaces},

volume = {11},

number = {35},

pages = {32552-32558},

abstract = {Nanostructured porous titania films are used in many energy-related applications. In this work, the temporal evolution of the mesoscopic deformation of mesoporous titania films synthesized via block copolymer-assisted sol\textendashgel chemistry is investigated with in situ grazing incidence small-angle neutron scattering (GISANS) during exposure to D2O vapor. Two types of mesoporous titania films are compared, which have a different degree of structural stability, depending on the applied annealing temperature (400 °C vs 600 °C) in a nitrogen atmosphere. Water ingression causes a gradual structure deformation in terms of decreasing center-to-center distances and broadening of the size distribution of the titania nanostructures. Based on the evolution of the mesopore size obtained from in situ GISANS measurements, the results show that structures synthesized at lower temperature undergo a stronger deformation because of the lower elastic modulus originating from larger pores, despite having a higher degree of order.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{nokey,

title = {Particle-in-a-Frame Nanostructures with Interior Nanogaps},

author = {S Lee and J Kim and H Yang and E Cort\'{e}s and S Kang and S W Han},

url = {https://onlinelibrary.wiley.com/doi/abs/10.1002/anie.201908291},

doi = {https://doi.org/10.1002/anie.201908291},

issn = {1433-7851},

year  = {2019},

date = {2019-09-03},

journal = {Angewandte Chemie International Edition},

volume = {58},

number = {44},

pages = {15890-15894},

abstract = {Abstract Designing plasmonic hollow colloids with small interior nanogaps would allow structural properties to be exploited that are normally linked to an ensemble of particles but within a single nanoparticle. Now, a synthetic approach for constructing a new class of frame nanostructures is presented. Fine control over the galvanic replacement reaction of Ag nanoprisms with Au precursors gave unprecedented Au particle-in-a-frame nanostructures with well-defined sub-2 nm interior nanogaps. The prepared nanostructures exhibited superior performance in applications, such as plasmonic sensing and surface-enhanced Raman scattering, over their solid nanostructure and nanoframe counterparts. This highlights the benefit of their interior hot spots, which can highly promote and maximize the electric field confinement within a single nanostructure.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@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 = {},

pubstate = {published},

tppubtype = {article}

}