Electrical conductivity responses of polyaniline films to SO2–N2 mixtures: effect of dopant type and doping level

✍ Scribed by P Kiattibutr; L Tarachiwin; L Ruangchuay; A Sirivat; J Schwank

• Publisher: Elsevier Science
• Year: 2002
• Tongue: English
• Weight: 438 KB
• Volume: 53
• Category: Article
• ISSN: 1381-5148
• DOI: 10.1016/s1381-5148(02)00141-4

✦ Synopsis

Electrical conductivity and the responses to SO -N mixtures of HCl-doped and CSA-doped solvent cast polyaniline 2 2 films (PANI / HCl and PANI / CSA) were investigated. At a given doping level or with the same number of charge carriers present, electrical conductivity of PANI / HCl films is greater than that of PANI / CSA films due to the more closely packed crystalline domain of the PANI / HCl films which reflects its greater charge carrier mobility. PANI / HCl films do not respond to SO , possibly because of its upper attainable apparent doping level or the number of charge carriers present. The 2 increment in electrical conductivity of PANI / CSA films upon exposure to SO depends critically on the apparent doping 2 level and varies linearly with SO concentration. The lowest detectable concentration is 200 ppm and the responses to SO 2 2 are reversible.