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Fabrication and Optical Emission of TiO2–Sheathed ZnO Nanowires

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Abstract:

The ZnO nanowires were synthesized by using vapor–liquid–solid mechanism and then the ZnO nanowires were sheathed with TiO2 by metal organic chemical vapor deposition. The coaxial nanowires were 30–200 nm in diameter and up to 0.2 μm in length. Transmission electron microscopy and X-ray diffraction analysis results showed that the ZnO cores and TiO2 shells of the core–shell nanowires had wurtzite and amorphous structures, respectively. Photoluminescence measurement showed that TiO2 coating increased and decreased the near-band edge (NBE) and deep-level emissions of the ZnO nanowires in intensity, respectively. However, it appeared that subsequent annealing was undesirable since it decreased the NBE emission in intensity.

Keywords: ENERGY-DISPERSIVE; PHOTOLUMINESCENCE; TIO2 COATING; TRANSMISSION ELECTRON MICROSCOPY; X-RAY SPECTROSCOPY; ZNO NANOWIRES

Document Type: Research Article

DOI: https://doi.org/10.1166/jnn.2012.4649

Publication date: 2012-02-01

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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