Gas sensing properties of ZnO nanowires growned by a double-tube vapor-liquid-solid process

• Main Authors: Chao-Yu Wu, 吳釗宇
• Other Authors: Ching-Pao Cheng
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/47977946448606384227

碩士 === 國立臺灣師範大學 === 工業教育學系 === 98 === This study is aiming on demonstrating Zinc Oxide (ZnO) nanostructures were successfully grown on Al/glass substrates by using a double-tube vapor-liquid-solid (VLS) technique without any gold (Au) metal catalyst or template. When the temperature was set at 900◦C, ZnO nanostructures were grown successfully under controlled. With the XRD analysis, ZnO nanowires were preferably grown in (002) direction and were in direct ration to the oxygen level. Also, the result of this study showed that the ratio of oxygen gas flow has the impact of the length and density of ZnO nanowires. ZnO nanowires were grown on Al/glass substrates in high density with 8 sccm oxygen gas flow under observing by Scanning Electron Microscope (SEM). It is also found that the ZnO nanowire 8 sccm sample has an outstanding electrical conduction property to measure the I-V characteristics. Moreover, ZnO nanowire has a better sensitivity to NO2 in compare of CO. Its response and recovery time are shorter with an excellent long-term reproducibility and stability. The sensitivities are 23、33、41 when it is to detect NO2 at 20 ppm, 60 ppm, 100 ppm, respectively, at 175◦C.