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Fabrication and characterization of abrupt TiO<sub>2</sub>–SiO<sub>x</sub> core-shell nanowires by a simple heat treatment

Fabrication and characterization of abrupt TiO2–SiOx core-shell nanowires by a simple heat treatment

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FOLGER, Alena, Julian KALB, Lukas SCHMIDT-MENDE, Christina SCHEU, 2017. Fabrication and characterization of abrupt TiO2–SiOx core-shell nanowires by a simple heat treatment. In: APL Materials. 5(8), 086101. eISSN 2166-532X. Available under: doi: 10.1063/1.4996211

@article{Folger2017-08Fabri-40192, title={Fabrication and characterization of abrupt TiO2–SiOx core-shell nanowires by a simple heat treatment}, year={2017}, doi={10.1063/1.4996211}, number={8}, volume={5}, journal={APL Materials}, author={Folger, Alena and Kalb, Julian and Schmidt-Mende, Lukas and Scheu, Christina}, note={Article Number: 086101} }

Scheu, Christina 2017-09-28T13:27:39Z Schmidt-Mende, Lukas Scheu, Christina Folger, Alena Fabrication and characterization of abrupt TiO<sub>2</sub>–SiO<sub>x</sub> core-shell nanowires by a simple heat treatment 2017-08 Schmidt-Mende, Lukas Folger, Alena 2017-09-28T13:27:39Z Kalb, Julian Three dimensional hierarchical metal oxide nanostructures, like TiO<sub>2</sub> nanowire arrays, have attracted great attention for electrochemical energy conversion and storage applications. The functionality of such devices can be further enhanced by adding a nanowire shell with a different stoichiometry or composition compared to the core. Here, we report an approach with a facile heat treatment at 1050 °C, which allows the fabrication of rutile TiO<sub>2</sub>–SiO<sub>x</sub> core-shell nanowire arrays on silicon substrates. Our detailed electron microscopic investigation shows that this method is able to cover hydrothermally grown rutile TiO<sub>2</sub> nanowires with a uniform shell of several nanometers in thickness. Moreover, the treatment improves the quality of the rutile TiO<sub>2</sub> core by removing lattice defects, introduced from the hydrothermal growth. Electron energy loss spectroscopy reveals that the homogeneous shell around the TiO<sub>2</sub> core consists of amorphous SiOx and does not form any intermediate phase with TiO<sub>2</sub> at the interface. Thus, the properties of the TiO<sub>2</sub> core are not affected by the shell, while the shell suppresses undesired electron back transfer. Latter leads to performance losses in many applications, e.g., dye sensitized solar cells, and is the main reason for a fast degradation of devices incorporating organic materials and TiO<sub>2</sub>. © 2017 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license eng Kalb, Julian

Dateiabrufe seit 28.09.2017 (Informationen über die Zugriffsstatistik)

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