Use of aminosilane coupling agent in the synthesis of conducting, hybrid polypyrrole-silica gel particles
✍ Scribed by Perruchot, Christian; Chehimi, Mohamed M.; Delamar, Michel; Fievet, Fernand
- Publisher
- John Wiley and Sons
- Year
- 1998
- Tongue
- English
- Weight
- 291 KB
- Volume
- 26
- Category
- Article
- ISSN
- 0142-2421
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✦ Synopsis
A new route for the synthesis of conducting polypyrrole-silica composites is described. Silica gel particles were modiÐed by aminopropyltriethoxysilane (APS) and acted as porous inorganic substrates for the in situ synthesis of polypyrrole (PPy). The resulting polypyrrole-silica-APS hybrid materials were characterized by XPS, thermogravimetric analysis, BET and conductivity measurements. It is found that APS yields a substantial increase in the PPy mass loading (from 6 to 11.5 wt.% ) but, more importantly, the hybrid particles obtained are conductive and have a negligible static charge in XPS due to their PPy-rich surfaces. In the absence of any APS treatment, polypyrrole is mainly loaded in the pores of the silica gel so these polypyrrole-silica particles are poorly conductive and charge up during XPS analysis. The conductivity threshold (10-2 S cm-1) was obtained for an APS initial concentration of 1% (v/v). In addition, these conducting hybrid particles have a fairly high speciÐc surface area in the 160-180 m2 g-1 range.