Abstract
The evolution of the frequency and temperature dependence of the conductivity of cis-polyacetylene [ cis-(CH) x ] lightly doped with iodine is reported. As the dopant concentration is increased, the frequency-dependent contribution to the conductivity remains unchanged while the frequency-independent contribution increases dramatically. These results are inconsistent with the formation of small isolated metallic islands embedded in undoped cis-(CH) x . The data support the idea that even at the lightest dopant levels studied (d.c. conductivity increased by only one order of magnitude), the doped regions are multiply connected, not isolated. Comparison with the temperature- and frequency-dependent conductivities of cis and trans-(CH) x implies that the doped regions are isomerized to the trans configuration and that there may be some structural evolution in the undoped fibril cores, in agreement with earlier spectroscopic and structural studies.
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