Physical properties of polypyrrole films containing tetracyanonickelate(II) anions, PPy–Ni(CN)4

Abstract

Polypyrrole–tetracyanonickelate, PPy–Ni(CN)₄, has been synthesized in thin-film form by electrochemical oxidation of pyrrole in aqueous or non-aqueous media. The room-temperature electrical conductivity of one of the films (122 S cm^–1) is the highest reported to date for any PPy–metal anion system. The temperature dependence of the conductivity is consistent with the Mott variable-range hopping model. Some of the films show good stability in air at room temperature, their conductivity decreasing by less than 7% over 50 days.