A Current-type Gas Sensor Based on Substituted Phthalocyanines

• Main Authors: Chang, Kun-Hui, 張琨揮
• Other Authors: Liu, Chin-Hsin
• Format: Others
• Language: zh-TW
• Published: 2002
• Online Access: http://ndltd.ncl.edu.tw/handle/70258850124782338191

碩士 === 國立臺灣科技大學 === 化學工程系 === 90 === Two substituted metallo-phthalocyanines, i.e. Copper(Ⅱ) 2, 9, 16, 23-tetra- tert-butyl-29H, 31H-phthalocyanine (CuttbPc) and Copper (Ⅱ) 3, 10, 17, 24- tetra-tert-butyl-1,8,15,22-tetrakis（dimethylamino）-29H, 31H-Phthalocyanine (CuttbtPc) were spin-coated onto alumina and fabricated into sensors for the detection of pollutant gases. The effects of operating parameters such as spinner speed, film thickness, substrate concentration, temperature and heat treatment on the sensing behavior were systematically investigated. It was found that the steady sate current of the CuttbPc sensor increases with the increase of SO2 concentration, operating temperature and film thickness. This sensor possesses satisfactory stability and reproducibility toward sensing SO2. Heat treatment profoundly affects the sensing characteristics of CuttbPc. While CuttbtPc, due to its strong electron-donating group which decreases the energy gap, can sense SO2 at a lower temperature of 90℃, as compared to 120℃ for CuttbPc.