Conference papers from 2018

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Marschick, Georg; Schell, Juliana; Stöger, Berthold; Gon¸calves, J. N.; Karabasov, Maksim O.; Zyabkin, Dmitry; Welker, Andree; Escobar Castillo, Marianela; Gärtner, Daniel; Efe, Ipek; Santos, Robinson Alves; Laulainen, Joonatan E. M.; Lupascu, Doru C.
Multiferroic bismuth ferrite: perturbed angular correlation studies on its ferroic α-β phase transition. - In: Physical review, ISSN 2469-9969, Bd. 102 (2020), 22, S. 224110-1-224110-11

https://doi.org/10.1103/PhysRevB.102.224110
Ziegler, Mario; Dathe, André; Pollok, Kilian; Langenhorst, Falko; Hübner, Uwe; Wang, Dong; Schaaf, Peter
Metastable atomic layer deposition: 3D self-assembly toward ultradark materials. - In: ACS nano, ISSN 1936-086X, Bd. 14 (2020), 11, S. 15023-15031

Black body materials are promising candidates to meet future energy demands, as they are able to harvest energy from the total bandwidth of solar radiation. Here, we report on high-absorption near-blackbody-like structures (>98% for a wide solar spectrum range from 220 to 2500 nm) consisting of a silica scaffold and Ag nanoparticles with a layer thickness below 10 m, fabricated using metastable atomic layer deposition (MS-ALD). Several effects contribute collectively and in a synergistic manner to the ultrahigh absorption, including the pronounced heterogeneity of the nanoparticles in size and shape, particle plasmon hybridization, and the trapping of omnidirectionally scattered light in the 3D hierarchical hybrid structures. We propose that, in the future, MS-ALD needs to be considered as a simple and promising method to fabricate blackbody materials with excellent broadband absorption.



https://doi.org/10.1021/acsnano.0c04974
Große-Knetter, Jörn; Schaaf, Peter
Das physikalische Praktikum : Handbuch 2020/2021 für Studentinnen und Studenten der Physik. - Göttingen : Universitätsverlag Göttingen, 2020. - (Universitätsdrucke)
Wang, Hongmei; Xiong, Jie; Cheng, Xing; Fritz, Mathias; Ispas, Adriana; Bund, Andreas; Chen, Ge; Wang, Dong; Schaaf, Peter
Ni3N-coated Ni nanorod arrays for hydrogen and oxygen evolution in electrochemical water splitting. - In: ACS applied nano materials, ISSN 2574-0970, Bd. 3 (2020), 11, S. 10986-10995
Im Titel ist "3" tiefgestellt

Designing high efficiency non-noble metal catalysts for electrochemical hydrogen and oxygen evolution reactions (HER and OER) is a challenging and promising task. In the present work, a large-scale self-supported black nickel sheet composed of nickel nanorod arrays (B-Ni) was successfully fabricated via electroplating with a nanostructured Si template assisted strategy, and Ni3N coating layer was coated on the structured surface followed by a nitrogen plasma treatment with different treatment durations. The black color is due to the immensely enhanced light absorption through the surface nanostructures with high aspect ratio. The samples show promising catalytic performance when used as electrochemical catalysts for both HER and OER in alkaline electrolyte. Benefiting from the nanostructure and the Ni3N coating, B-Ni_N2_10 min exhibits low onset potentials of 1.560 and 0.165 V at a current density of 10 mA/cm2 for OER and HER, respectively. The calculated electrochemical surface area (ECSA) for B-Ni is 10 times higher than the pristine Ni sheet (P-Ni), while after nitrogen plasma treatment, the ECSA for B-Ni_N2_10 min is 21 times higher than that of the P-Ni. In addition, all the catalysts show good electrochemical stabilities. All the improvements for the electrochemical performances suggest that nanostructured nickel nitride could be a promising inexpensive catalyst system for both OER and HER processes.



https://doi.org/10.1021/acsanm.0c02222
Reiprich, Johannes; Isaac, Nishchay Angel; Schlag, Leslie; Kups, Thomas; Hopfeld, Marcus; Ecke, Gernot; Stauden, Thomas; Pezoldt, Jörg; Jacobs, Heiko O.
Localized and programmable chemical vapor deposition using an electrically charged and guided molecular flux. - In: ACS nano, ISSN 1936-086X, Bd. 14 (2020), 10, S. 12885-12894

Chemical vapor deposition is a widely used material deposition technique. It commonly provides a uniform material flux to the substrate to cause uniform thin film growth. However, the ability to precisely adjust the local deposition rate would be highly preferable. This communication reports on a chemical vapor deposition method performed in a localized and programmable fashion by introducing an electrically charged and guided molecular flux. This allows for local adjustments of the deposition rate and three-dimensional shape by controlling the electric fields. Specifically, the precursor molecules are charged and then guided by arrays of electrodynamic funnels, which are created by a patterned dielectric layer, to predetermined deposition locations with a minimal spot size of 250 nm. Furthermore, nearest neighbor coupling is reported as a shaping method to cause the deposition of three-dimensional nanostructures. Additionally, the integration of individually addressable domain electrodes offers programmable charge dissipation to achieve an ON/OFF control. The described method is applicable to a wide variety of materials and precursors. Here, the localized and programmable deposition of three-dimensional copper oxide, chromium oxide, zinc oxide, and carbon nanowires is demonstrated.



https://doi.org/10.1021/acsnano.0c03726
Qi, Bingcui; Gunnlaugsson, Haraldur Páll; Ólafsson, Sveinn; Gislason, Haflidi Pétur; Thorsteinsson, Einar Baldur; Arnalds, Unnar Bjarni; Mantovan, Roberto; Unzueta l, Iraultza; Zyabkin, Dmitry; Ram, Krishanlal Bharuth; Johnston, Karl; Krastev, Petko Borislavov; Mølholt, Torben Esmann; Masenda, Hilary; Martín-Luengo, Aitana Tarazaga; Naidoo, Deena; Schell, Juliana
Metal-insulator transition in crystalline V2O3 thin films probed at atomic-scale using emission Mössbauer spectroscopy. - In: Thin solid films, ISSN 1879-2731, Bd. 714 (2020), 138389
Im Titel sind "2" und "3" tiefgestellt

Microscopic understanding the metal-to-insulator transition (MIT) in strongly correlated materials is critical to the design and control of modern "beyond silicon" Mott nanodevices. In this work, the local MIT behaviors in single crystalline V2O3 thin films were probed on an atomic scale by online 57Fe emission Mössbauer spectroscopy (eMS) following dilute (<10^-3 at.%) implantation of 57Mn+ (T1/2 = 90 s). Both the epitaxial and the textured V2O3 thin films grown by direct current magnetron sputtering were studied. Three structural components were resolved and identified in the eMS spectra with parameters characteristic of Fe in the 2+ valence state, which are attributable to Fe in either lattice damage or structural defects and Fe in the intrinsic crystal structure of V2O3, respectively. The results prove that the oxygen vacancies are common in the V2O3 thin films. With co-existence of both the non-stoichiometry and epitaxial strain in the thin films, the epitaxial strain plays a dominant role in controlling the global MIT properties of the film. The atomic scale structural transition captured by the eMS affirms the early-stage dynamics of the MIT of V2O3 thin film reported previously. These results approve the feasibility to tune the electronic transport of the V2O3 thin films for the next-generation Mott nanodevices by the epitaxial strain via the sample growth parameters.



https://doi.org/10.1016/j.tsf.2020.138389
Honig, Hauke; Hopfeld, Marcus; Schaaf, Peter
Preparation and properties of Co/Fe multilayers and Co-Fe alloy films for application in magnetic field sensors. - In: Materials science and smart materials, (2020), S. 61-66

Wöste, Andreas; Hergert, Germann; Vogelsang, Jan; Wang, Dong; Groß, Petra; Lienau, Christoph
Revealing time resolved electron-electron interactions on the nanoscale with ultrafast electron microscopy. - In: DPG-Frühjahrstagung (DPG Spring Meeting) of the Condensed Matter Section (SKM) together with the DPG Division Environmental Physics and the Working Groups Accelerator Physics; Equal Opportunities; Energy; Industry and Business; Physics, Modern IT and Artificial Intelligence, Young DPG, (2020), O 33.9

Yi, Juemin; Wang, Dong; Zhong, Jinhui; Schaaf, Peter; Runge, Erich; Lienau, Christoph
Fluctuation-modulated third harmonic deep ultraviolet emission from randomly disordered Si nanograss. - In: DPG-Frühjahrstagung (DPG Spring Meeting) of the Condensed Matter Section (SKM) together with the DPG Division Environmental Physics and the Working Groups Accelerator Physics; Equal Opportunities; Energy; Industry and Business; Physics, Modern IT and Artificial Intelligence, Young DPG, (2020), O 18.10

Zhong, Jin-Hui; Vogelsang, Jan; Yi, Jue-Min; Wang, Dong; Wittenbecher, Lukas; Mikaelsson, Sara; Korte, Anke; Chimeh, Abbas; Arnold, Cord L.; Schaaf, Peter; Runge, Erich; L'Huillier, Anne; Mikkelsen, Anders; Lienau, Christoph
Nonlinear plasmon-exciton coupling enhances sum-frequency generation from a Au/ZnO nanohybrid. - In: DPG-Frühjahrstagung (DPG Spring Meeting) of the Condensed Matter Section (SKM) together with the DPG Division Environmental Physics and the Working Groups Accelerator Physics; Equal Opportunities; Energy; Industry and Business; Physics, Modern IT and Artificial Intelligence, Young DPG, (2020), O 18.9