Fabrication and optical emission of TiO2-sheathed ZnO nanowires |
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Authors: | Jin Changhyun Kim Hyunsu Lee Jungkeun Lee Chongmu |
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Affiliation: | Department of Materials Science and Engineering, Inha University, 253 Yonghyeon-Dong, Incheon 402-751, Republic of Korea. |
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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 microm 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. |
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