Aging influence on electronic transport properties of Polyaniline blends

Electrical conductivity of conducting polymer blends based on polyaniline h as been studied under different aging conditions. The relative stability of these films with various dopants has been compared and the evolution of th e transport properties with aging has been investigated in the range 77 to 300K. All results are interpreted in the framework of a heterogeneous model where conduction is mainly dominated by a hopping mechanism between conduc ting clusters separated by thin insulating barriers. Above the percolation threshold. thermal aging leads to an expansion of the insulating barriers t o the detriment of the cluster size.