Electrical Conductivity of Polypyrrol-Films as Affected by Adsorption of Vapors

Chemically prepared polypyrrole films were exposed to vapors of sulfur dioxide, methyl amine, ammonia, and water. The resulting increase in electrical conductivity was measured as a function of the partial pressure. The results are discussed on the basis of the modification of the polymer surface layer by adsorption of molecules and subsequent electron transfer.