A selective conductive polymer-based sensor for volatile halogenated organic compounds (VHOC)
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- 作者：Rosamaria W.C. Li ; Leonardo Ventura ; Jonas Gruber ; Yoshio Kawano ; Lilian R.F. Carvalho
- 关键词：Conductive polymers ; Gas sensors ; Volatile organic compounds ; Volatile halogenated organic compounds
- 刊名：Sensors and Actuators B: Chemical
- 出版年：2008
- 出版时间：14 May 2008
- 年：2008
- 卷：131
- 期：2
- 页码：646-651
- 全文大小：351 K
文摘
A novel poly(p-xylylene), PPX, derivative bearing alkoxyphenyl side groups was electrochemically synthesized in 87 % yield. The polymer, poly(4′-hexyloxy-2,5-biphenyleneethylene) (PHBPE), presented a fraction (92 % ) soluble in common organic solvents. It showed to be thermally resistant up to 185 °C. UV–vis analysis revealed an Egap of 3.5 eV. Gas sensors made from thin films of 10-camphorsulfonic acid-doped PHBPE deposited on interdigitated electrodes exhibited significant changes in electrical conductance upon exposure to five VHOCs: 1,2-dichloroethane, bromochloromethane, trichloromethane, dichloromethane and tetrachloromethane. The conductance decreased after exposure to tetrachloromethane and increased after exposure to all the other VHOCs. Three-dimensional plots of relative response versus time of half response versus time of half recovery showed good discrimination between the five VHOCs tested.