The efficiency of the gas adsorption on ZnO nanorods inspected by second harmonic generation
楊棋幃1*, 張峰銘2, Sanjaya Brahma1, 羅光耀1
1物理所, 國立成功大學, 台南市, Taiwan
2物理系, 國立成功大學, 台南市, Taiwan
* presenting author:楊棋幃, email:ycw0409@gmail.com
The gas sensor properties of semiconductor oxide (SMO) nanostructures have been widely investigated and improved for further application. It is of great practical importance to detect irritable and toxic gas which is produced from industry or household natural gas. ZnO nanorods is the candidate materials of gas sensor since it is easily fabricated and cheap. However, the efficiency and identification of gas sensor still needs to improve for further application.
The mechanism of SMO is based on the redox reaction between target gas and chemisorbed oxygen species on the surface of metal oxide semiconductors. Thus, chemisorbed oxygen species on the surface of zinc oxide will influence the surface quality and electrical properties. Second harmonic generation (SHG) has strong sensitivity on the variation of surface quality. This work, we report the correlation between SHG results and the gas adsorption on ZnO nanorods.


Keywords: ZnO, sensor