Abstract
Doping effects of conducting polymer (CP)-C 60 composites by n-type dopants, namely, by alkali metals, are investigated, emphasizing the electron spin resonance (ESR) spectroscopy together with conductivity changes upon K-doping of poly(3-alkylthiophene) (PAT)-(C 60) y composites at various fullerene concentrations y. The ESR shows two types of lines: one from polarons on PAT chains, and the other from K 3C 60 clusters and monomolecular C 60 radicals. The evolution of conductivity suggests that, at comparatively large C 60 content y = 0.05, the composite can be viewed as a network of C 60 clusters in the PAT host matrix at the initial K-doping stage. K 3C 60 metallic islands are formed, while the PAT matrix is still insulating so that increase of conductivity is slower than in the pure PAT case. These results are consistent with the granular nature of superconducting phases found by us in PAT(C 60) y K x at y ≥ 0.005 by low-field microwave absorption (LFMA).
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