Solid-state reaction formation of ZnO-Zn2GeO4 heterostructures and its applications in sensing devices

• Main Authors: Lin, Tzu-Yin, 林姿吟
• Other Authors: Liang, Yuan-Chang
• Format: Others
• Language: zh-TW
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/04031823972757042716

碩士 === 國立臺灣海洋大學 === 材料工程研究所 === 103 === Well-crystalline one-dimensional ZnO-Zn2GeO4 (ZGO) heterostructures were successfully synthesized using a high-temperature solid-state reaction between the ZnO and Ge layers of ZnO-Ge core-shell nanostructures. The polycrystalline ZGO crystallites had a thickness in the range of 17 to 26 nm. The high-temperature solid-state reaction induced grooves and crystal defects on the surfaces of the ZGO crystallites. The sensors made from the ZnO-ZGO heterostructures exhibited a marked photocurrent response to UV light at room temperature. For the gas sensing test, the ZnO-ZGO has a visible sensitivity to various reducing and oxidizing gases because of ZGO shell provides many efficient adsorption sites for gases. The observed sensing properties are attributed to the rugged surface of the ZGO heterointerfaces between ZnO and ZGO, surface crystal defects of ZGO, and cross-linked contact regions of ZnO-ZGO.