✦ LIBER ✦

Examining the use of TiO2 to enhance the NH3 sensitivity of polypyrrole films

✍ Scribed by Yan Wu; Shuangxi Xing; Jiacai Fu

Publisher: John Wiley and Sons
Year: 2010
Tongue: English
Weight: 136 KB
Volume: 118
Category: Article
ISSN: 0021-8995
DOI: 10.1002/app.32382

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✦ Synopsis

Polypyrrole/Titanium dioxide (PPy/TiO 2 ) composite thin films were prepared by polymerizing the monomer pyrrole in aqueous solution containing a certain amount of TiO 2 particles at room temperature, and their response to ammonia (NH 3 ) gas was examined systematically. Compared with the pristine PPy film, which reached the saturation at the concentration of NH 3 beyond 200 ppm, the composite films showed more stable response and higher sensitivity. Furthermore, the PPy/TiO 2 com-posite thin films exhibited a low detection limit of 2 ppm. The film thickness, which had a strong influence on the film sensitivity to NH 3 , could be controlled by varying the polymerization time. The sensitivity to NH 3 gas of the samples with different content of TiO 2 and different molar ratio of PPy/TiO 2 /oxidant was studied. V

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