Growth and characterization of one-dimensional ZnS:Cu nanostructures and Cu2-xS/ZnS core-shell structures

• Main Authors: Shan-ShanQiu, 邱珊珊
• Other Authors: Chuan-Pu Liu
• Format: Others
• Language: zh-TW
• Published: 2016
• Online Access: http://ndltd.ncl.edu.tw/handle/97710031167588459809

碩士 === 國立成功大學 === 材料科學及工程學系 === 104 === ZnS nanostructures with variety morphology such as nanobelts, nanowires, nanosaws and nanocombs have been synthesized via VLS growth mechanism. Structure characterization revealed that nanobelts and nanowires both have Cubic and Hexagonal phases. Nanosaw consists of cubic teeth and hexagonal trunk while the nanocombs have single crystalline Wurtzite (WZ) structure. The positive polar surface of WZ structure causes the second growth on its lateral surface. The nanocomb is transformed from the nanobelts, which is etched along the preferential crystallographic planes in a reactive atmosphere. Cu-doped ZnS nanowires have also been synthesized. The copper-doped nanowires have two morphologies, the straight and the zigzag shape. The copper atoms may cause the lattice distortion in ZnS nanowire and to compensate the energy difference, the nanowire may change growth direction and form the zigzag shape. Finally, we use the ZnS nanowires as template to synthesize the ZnS/Cu2-xS core/shell structures. We also measured the photo response of single ZnS nanowire and ZnS/Cu2-xS nanowire and found that ZnS/Cu2-xS nanowire has high responsivity to UV and 800 nm wavelength light. Moreover, ZnS nanosaw also has enhanced UV light responsivity.