Electropolymerized poly(terthiophene) (PTT) films on Pt electrodes have been studied using in situ electron spin resonance (ESR) spectroscopy. ESR spectra were acquired as a function of doping level for both p‐ and n‐doping of PTT films exposed to tetraethylammonium solutions. Within the accessible potential range, the maximum n‐doping level is of the maximum p‐doping level. At low p‐ and n‐doping levels, radicals are generated approximately linearly with injected charge, although the spin:charge ratio is substantially below unity. Linewidths indicate these spins to be mobile. At high p‐doping levels, the ESR signal intensity decreases and the linewidth increases; we interpret this in terms of metallic characteristics. Following p‐doping, nominally undoped films contain trapped radicals, which are removed on subsequent p‐ or n‐doping. Throughout, g values indicate little or no participation of the heteroatom orbitals. For the thin films studied here no skin effects are observed.
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Bandey et al. (1995) studied this question.