Correlation of Seebeck coefficient and electric conductivity in polyaniline and polypyrrole

Abstract

We have measured the Seebeck coefficient and electric conductivity in the air-stable conducting polymers polyaniline and polypyrrole at different doping levels. We find, at 300 K, the general correlation that the logarithm of the electrical conductivity varies linearly with the Seebeck coefficient on doping, but with a proportionality substantially in excess of a prediction from simple theory for a single type of mobile carrier. The correlation is unexpected in its universality and unfavorable in its consequences for thermoelectric applications. A standard model suggests that conduction by carriers of both signs may occur in these doped polymers, which thus leads to reduced thermoelectric efficiency. We also show that polyacetylene ͑which is not air stable͒, does exhibit the correlation with the expected proportionality, and, thus, its properties could be more favorable for thermoelectricity.

Variations of the Thermoelectric Characteristics of ZnO Nanofibers from the Use of a Thermal Treatment

“…The smaller diameter comprises a greater compaction of the compositional materials inside the NFs, and the higher compaction leads to an improved transport of the charge carriers in the NFs [13,14]; simultaneously, the diameter contraction enhances the charge-carrier concentration. The electrical conductivity is therefore inversely related to the diameter; meanwhile, the enhancement of the charge-carrier concentration causes a decrease of the Seebeck coefficient [15]. The higher compaction of the compositional materials inside the NFs is therefore responsible for both the enhancement of the electrical conductivity and the diminishment of the Seebeck coefficient with the sintering (as shown in Fig.…”

Solvent-Dependent Thermoelectric Properties of PTB7 and Effect of 1,8-Diiodooctane Additive

“…To date, few conducting polymers have been studied for their thermoelectric properties [13,[15][16][17][18]; therefore, samples of PTB7 polymer were prepared and investigated.…”

Improved Thermoelectric Behavior of Poly(3,4-ethylenedioxythiophene)-Poly(styrenesulfonate) Using Poly(N-vinyl-2-pyrrolidone)-coated GeO2 Nanoparticles

“…Recently, new energy without CO 2 emission has attracted considerable attention and the development of thermoelectric conversion materials that convert thermal energy into electric energy has been reported. 2 In particular, a thermoelectric conversion element composed of an organic material with an electronic carrier (such as a conductive polymer 3,4 and a polymer complex 5,6 ) has advantages of lightweight, mechanical flexibility, low cost, and is a material with extremely high potential. 7 Furthermore, it does not use rare metals as inorganic heat electric materials and is low cost.…”