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A selective conductive polymer-based sensor for volatile halogenated organic compounds (VHOC) |
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| Authors: | Rosamaria W.C. Leonardo Jonas Yoshio Lilian R.F. |
| Affiliation: | aInstituto de Química, Universidade de São Paulo, Caixa Postal 26077, 05513-970 São Paulo, SP, Brazil bInstituto de Matemática e Estatística, Universidade de São Paulo, Brazil |
| Abstract: | 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. |
| Keywords: | Conductive polymers Gas sensors Volatile organic compounds Volatile halogenated organic compounds |
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