Gas-Response Studies of Polyaniline Composite Film Containing Zeolite to Chemical Vapors

✍ Scribed by Xingfa Ma; Huizhong Xu; Guang Li; Mang Wang; Hongzheng Chen; Song Chen

• Publisher: John Wiley and Sons
• Year: 2006
• Tongue: English
• Weight: 238 KB
• Volume: 291
• Category: Article
• ISSN: 1438-7492
• DOI: 10.1002/mame.200600234

✦ Synopsis

Abstract

Summary: In order to obtain new materials with synergetic or complementary behaviors, polyaniline composite was prepared by chemical oxide method using zeolite as template. A film over interdigital carbon electrodes was formed via casting approach. Gas sensitivity of the film to trimethylamine was examined at room temperature. The results indicated that, in comparison with the polyaniline film prepared by normal in situ polymerization, not only the morphology of polyaniline composite was clearly different, but also the heat stability of polyaniline film was improved significantly by adding zeolite. Gas sensitivity of the composite film to trimethylamine strongly depended on the type of zeolite added. For the system containing β‐zeolite (its specific surface area was 592 m^2^ · g^−1^, the size of the channel was 2.27 nm, mole ratio of Si/Al was 60), the gas sensitivity to trimethylamine decreased remarkably compared with that of polyaniline film and for FUYB‐zeolite (its specific surface area was 740 m^3^ · g^−1^, the size of the channel was 2.46 nm, mole ratio of Si/Al was 12), it was enhanced significantly. All these may be the results of synergetic effects or complementary behaviors between polyaniline and zeolite. This composite film showed excellent gas sensitivity and stability, rapid response to trimethylamine, and good selectivity to analogous gases while being easily recovered with high‐purity N~2~ to exhibit good reproducibility.

Dynamical response of polyaniline composite film containing zeolite to trimethylamine.

magnified imageDynamical response of polyaniline composite film containing zeolite to trimethylamine.