A magnetic susceptibility study of emeraldine base polyaniline
Paramagnetic spins are found even in carefully synthesized samples of emeraldine base polyaniline. We report here magnetic susceptibility data up to a temperature of 475 K on a number of emeraldine base samples that were synthesized at different oxidant to monomer ratios. All the samples, although electrically insulating, show the presence of Pauli-like susceptibility. A simple albeit physically realistic model involving spin-pairs is shown to lead to such a dependence on temperature. The analysis of the data indicates that polarons in emeraldine base are created in pairs and that the intra-pair interactions encompass a broad distribution of antiferromagnetic exchange couplings.
magnetic susceptibility study, emeraldine base polyaniline, polyaniline
Kahol, P. K., A. Raghunathan, and B. J. McCormick. "A magnetic susceptibility study of emeraldine base polyaniline." Synthetic metals 140, no. 2-3 (2004): 261-267.