@article{nokey,

title = {Single Antibody Detection in a DNA Origami Nanoantenna},

author = {M Pfeiffer and K Trofymchuk and S Ranallo and F Ricci and F Steiner and F Cole and V Glembockyte and P Tinnefeld},

url = {https://www.sciencedirect.com/science/article/pii/S2589004221010403},

doi = {https://doi.org/10.1016/j.isci.2021.103072},

issn = {2589-0042},

year  = {2021},

date = {2021-09-01},

journal = {iScience},

pages = {103072},

abstract = {Summary DNA nanotechnology offers new biosensing approaches by templating different sensor and transducer components. Here, we combine DNA origami nanoantennas with label-free antibody detection by incorporating a nanoswitch in the plasmonic hotspot of the nanoantenna. The nanoswitch contains two antigens that are displaced by antibody binding thereby eliciting a fluorescent signal. Single antibody detection is demonstrated with a DNA origami integrated anti-digoxigenin antibody nanoswitch. In combination with the nanoantenna, the signal generated by the antibody is additionally amplified. This allows the detection of single antibodies on a portable smartphone microscope. Overall, fluorescence enhanced antibody detection in DNA origami nanoantennas shows that fluorescence enhanced biosensing can be expanded beyond the scope of the nucleic acids realm.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{nokey,

title = {Highly conductive titania supported iridium oxide nanoparticles with low overall iridium density as OER catalyst for large-scale PEM electrolysis},

author = {D B\"{o}hm and M Beetz and C Gebauer and M Bernt and J Schr\"{o}ter and M Kornherr and F Zoller and T Bein and D Fattakhova-Rohlfing},

url = {https://www.sciencedirect.com/science/article/pii/S2352940721001980},

doi = {https://doi.org/10.1016/j.apmt.2021.101134},

issn = {2352-9407},

year  = {2021},

date = {2021-09-01},

journal = {Applied Materials Today},

volume = {24},

pages = {101134},

abstract = {To enable future large-scale generation of hydrogen via proton exchange membrane (PEM) electrolysis, utilization of scarce iridium-based catalysts required for the oxygen evolution reaction (OER) has to be significantly lowered. To address this question, the facile synthesis of a highly active TiO2 supported iridium oxide based OER catalyst with reduced noble metal content and an Ir-density of the catalyst powder as low as 0.05\textendash0.08 gIr cm-3 is described in this work. A high surface area corrosion-resistant titania catalyst support homogeneously coated with a 1-2 nm thin layer of amorphous IrOOHx is oxidized in molten NaNO3 between 350-375°C. This procedure allows for a controllable phase transformation and crystallization to form a layer of interconnected IrO2 nanoparticles of ≈2 nm on the surface of the TiO2 support. The increase in crystallinity is thereby accompanied by a significant increase in conductivity of up to 11 S cm-1 for a 30 wt% Ir loaded catalyst. Oxidized samples further display a significantly increased stability with less detectable Ir dissolution under OER conditions. With a mass-based activity of 59 A g-1 at an overpotential of 300 mV, the electrocatalytic activity is maintained at the level of the highly active amorphous IrOOHx phase used as precursor and outperforms it at higher current densities through the increased conductivity. MEA measurements with catalyst loadings of 0.2-0.3 mg cm-2 further confirm the high catalytic activity and initial stability at industrially relevant current densities. The introduced synthesis approach therefore shows a path for the fabrication of novel highly active and atom-efficient oxide supported catalysts with complex nanostructures and thin homogenous nanoparticle coatings that allows a future large-scale application of PEM electrolysis technology without restrictions by the natural abundance of iridium.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{nokey,

title = {Indirect bandgap, optoelectronic properties, and photoelectrochemical characteristics of high-purity Ta3N5 photoelectrodes},

author = {J Eichhorn and S P Lechner and C-M Jiang and G Folchi Heunecke and F Munnik and I D Sharp},

url = {http://dx.doi.org/10.1039/D1TA05282A},

doi = {10.1039/D1TA05282A},

issn = {2050-7488},

year  = {2021},

date = {2021-08-26},

journal = {Journal of Materials Chemistry A},

abstract = {The (opto)electronic properties of Ta3N5 photoelectrodes are often dominated by defects, such as oxygen impurities, nitrogen vacancies, and low-valent Ta cations, impeding fundamental studies of its electronic structure, chemical stability, and photocarrier transport. Here, we explore the role of ammonia annealing following direct reactive magnetron sputtering of tantalum nitride thin films, achieving near-ideal stoichiometry, with significantly reduced native defect and oxygen impurity concentrations. By analyzing structural, optical, and photoelectrochemical properties as a function of ammonia annealing temperature, we provide new insights into the basic semiconductor properties of Ta3N5, as well as the role of defects on its optoelectronic characteristics. Both the crystallinity and material quality improve up to 940 °C, due to elimination of oxygen impurities. Even higher annealing temperatures cause material decomposition and introduce additional disorder within the Ta3N5 lattice, leading to reduced photoelectrochemical performance. Overall, the high material quality enables us to unambiguously identify the nature of the Ta3N5 bandgap as indirect, thereby resolving a long-standing controversy regarding the most fundamental characteristic of this material as a semiconductor. The compact morphology, low defect content, and high optoelectronic quality of these films provide a basis for further optimization of photoanodes and may open up further application opportunities beyond photoelectrochemical energy conversion.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}