Low humidity sensing properties of CNTs

• Main Authors: Jia-Fang Tsai, 蔡佳芳
• Other Authors: Pi-Guey Su
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/40921786204516204120

碩士 === 中國文化大學 === 應用化學研究所 === 96 === This study investigated the low-humidity sensing performance of raw single-walled nanotubes (SWCNTs), oxidized SWCNTs (SWCNT-COOH), raw multi-walled nanotubes (MWCNTs), oxidized MWCNTs (MWCNT-COOH) and Pd modified MWCNT-COOH (Pd-MWCNT-COOH) thin films by using a quartz crystal microbalance (QCM). The characterizations of the thin films were analyzed by scanning electron microscopy (SEM) and atomic force microscopy (AFM). Water vapor molecules adsorbed onto Pd-MWCNT-COOH thin films had a larger frequency shift than raw SWCNTs,SWCNT-COOH, raw MWCNTs and MWCNT-COOH thin films. Adsorption dynamic analysis, molecular mechanics calculation (association constant), was applied to elucidate how surface modification and functionalization of CNTs increase the sensitivity to low-humidity sensing.