Thermal conductivity of polyacetylene

摘要

The thermal conductivity of polyacetylene has been measured in the temperature range of 0.8 to 300 K. ForT70 K we present also data of AsF5hyphen;doped samples and of doped samples which have been compensated with (CH3)2NH into the insulating state. The undoped sample shows aT2hyphen;temperature dependence up to 12 K followed by a decreasing power law at higher temperatures and a thermal conductivity value of 4 mW/K cm at room temperature. Doping and even compensating increases the thermal conductivity below 12 K. This additional conductivity is therefore explained by a change in the phonon boundary scattering at the interfaces between crystalline and amorphous regions of polyacetylene and not by a contribution of charge carriers to the thermal conductivity.