Low cost selective sensor for carbonyl compounds in air based on a novel conductive poly(p-xylylene) derivative
✍ Scribed by Rosamaria W.C. Li; Lilian R.F. Carvalho; Leonardo Ventura; Jonas Gruber
- Publisher
- Elsevier Science
- Year
- 2009
- Tongue
- English
- Weight
- 413 KB
- Volume
- 29
- Category
- Article
- ISSN
- 0928-4931
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✦ Synopsis
A novel poly(p-xylylene), PPX, derivative bearing phenyl side groups was electrochemically synthesized in 85% yield. The polymer, poly(2-phenyl-p-xylylene) (PPPX), presented a major fraction (88%) soluble in common organic solvents. It showed to be thermally resistant up to 140 °C. UV-VIS analysis revealed an Egap of ~3.0 eV. Gas sensors made from thin films of CSA doped PPPX deposited on interdigitated electrodes exhibited significant changes in electrical conductance upon exposure to five carbonyl compounds: acetaldehyde, propionaldehyde, benzaldehyde, acetone and butanone. Three-dimensional plots of relative response vs. time of half-response vs. time of half-recovery showed good discrimination between the five carbonyl compounds tested.