期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 749, 期 -, 页码 217-220出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2018.03.184
关键词
ZnO@TiO2 core/shell nanowires; TiO2 shell; Electron-hole separation; Photoluminescence spectra
资金
- Natural Science Foundation of Jiangsu Province of China [BK20150829, BK20150831]
- Scientific Research Foundation of Nanjing University of Posts and Telecommunications, China [NY215023]
In this work, a strong electron-hole separation effect in ZnO@TiO2 core/shell nanowire arrays was investigated. On the surface of well-aligned ZnO nanowires, a high-quality TiO2 shell was grown in a range of thicknesses through the deposition of TiO2 nanoparticles on ZnO nanowire arrays by pulsed laser deposition (PLD). In the photoluminescence (PL) spectra of the ZnO@TiO2 core/shell nanowires, a strong and broad visible emission band from 450 to 650 nm appears, which is related to surface defects; meanwhile, the ultraviolet (UV) emission due to exciton recombination simultaneously disappears. These changes in the PL spectra originate from a highly efficient electron-hole separation effect. This work presents evidence of this strong electron-hole separation effect in these ZnO@TiO2 core/shell nanowire arrays, which makes them promising candidates for use in optoelectronic devices for dye-sensitized solar cells and ultraviolet photodetectors. (C) 2018 Elsevier B.V. All rights reserved.
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