Organic conductor: Influence of preparation temperature

Abstract

Thermal diffusivity Electrical conductivity Dopant a b s t r a c t The conducting polypyrrole-polyethylene glycol (PPy-PEG) composite films were produced at various polymerization temperature ranging from 5 • C to 60 • C using 1 × 10 −3 M PEG, 0.20 M pyrrole and 0.10 M p-toluene sulfonate at 1.20 V (vs. SCE). The polymerization temperature of 5 • C appeared as the optimum preparation temperature showing the highest electrical conductivity of 70 S/cm and the thermal diffusivity of 8.76 × 10 −7 m 2 s −1 . The electrical conductivity and thermal diffusivity exhibited a decreasing trend with the increase in polymerization temperature in the pyrrole solution used to prepare the composite films.The XRD results reveal that low temperature (5 • C) typically results in more crystalline films, which are denser, stronger and have higher conductivity. The optical microscopy of PPy-PEG shows the globular surface morphology. The surface of the of the solution side of PPy-PEG film prepared at low temperatures showed a globular morphology.