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Abstract
The results of temperature dependent dc conductivity, EPR magnetic susceptibility, and X-ray photoelectron spectroscopy experiments (XPS) are reported for polyaniline (PAN) doped with lithium hexafluorophosphate (LiPF 6), PAN-LiPF 6. DC conductivity ( σ dc) and its temperature dependence of PAN-LiPF 6 samples vary with the average molecular weight (Mw) of polyaniline used and the composition of doping solution. The EPR linewidth and Pauli susceptibility ( χ P) depend on the Mw of PAN used. The σ dc and the χ P of the intermediate Mw PAN-LiPF 6 samples are higher than those of the low Mw PAN samples, indicating more highly conducting state of the intermediate Mw PAN samples. Based on the results of XPS and EPR experiments, some portions of quinoid rings in emeraldine base form of PAN are transformed into benzenoid rings through LiPF 6 doping process, indicating the formation of polarons. However, the existence of some portions of quinoid rings in PAN-LiPF 6 samples after doping suggests an inhomogeneous doping or a pseudo doping.
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