Fabrication of ZnO /TiO2 core-shell nanowires

• Main Authors: Guan-Lin Chen, 陳冠霖
• Other Authors: 簡世森
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/10802524181481740632

碩士 === 東海大學 === 物理學系 === 97 === This experiment fabricates of ZnO/TiO2 core-shell nanowires by sol – gel method for applications of optoelectronic devices. ZnO nanowires are grown by Chemical Vapor Deposition (CVD) in this experiment, and ZnO/TiO2 core-shell nanowires assembled by soaking the nanowires in gel solution of TiO2 starting material are baked at 85 ℃ in 72 hours and annealed at 400℃ in 2 hours. In the beginning, the as-grown ZnO nanowires are all over 5 mm showed in SEM. The TEM image illustrates that diameter of wire is 30 nm with single crystal indicated by TEM diffraction patterns. The XRD results indicate the elements of nanowires are ZnO. There is a peak at 379 nm in PL spectrum without any defect emission. After the core-shell structure is formed, the diameter of nanowires is about 70 nm~120 nm with 10 nm~30 nm TiO2 covering. Moreover, the TEM diffraction patterns show that the phase of TiO2 is not only Anatase but also Rutile in the core-shell structure. The XRD results indicate that the element of ZnO/TiO2 core-shell nanowires we fabricated is only ZnO, because the crystalline qualities of TiO2 are so weak that it’s hard to be detected by XRD. Nevertheless, the defect emissions appear after 430nm as the nanowires soak in TiO2 sol-gel solution. We have fabricated the TiO2 core-shell structures on ZnO nanowires by sol-gel method, and the experiment results demonstrate that these nanowires could apply to the requirements of the optoelectronic devices such as the solar cells and so on.