Jump to main content
Jump to site search
Access to RSC content Close the message box

Continue to access RSC content when you are not at your institution. Follow our step-by-step guide.


Issue 26, 2014
Previous Article Next Article

Enhanced thermoelectric performance of PEDOT with different counter-ions optimized by chemical reduction

Author affiliations

Abstract

This work reports on the synthesis of the intrinsically conducting polymer poly(3,4-ethylenedioxythiophene) (PEDOT) doped with several counter-ions, ClO4, PF6 and bis(trifluoromethylsulfonyl)imide (BTFMSI), by electro-polymerization and its thermoelectric properties. We show that, depending on the counter-ion size, the thermoelectric efficiency of PEDOT can be increased up to two orders of magnitude. A further chemical reduction with hydrazine optimizes the power factor (PF). By changing the counter-ions, we were able to increase the electrical conductivity (σ) of PEDOT by a factor of three, while the Seebeck coefficient remains at the same order of magnitude in the three polymers. The best thermoelectric efficiency has been observed in PEDOT:BTFMSI. From the measurement of the Seebeck coefficient and σ, a PF of 147 μW m−1 K−2 has been deduced, while the measured thermal conductivity is κ = 0.19 W m−1 K−1, resulting in a ZT ∼ 0.22 at room temperature, one of the highest values reported in the literature for polymers. The increase in σ with the change of the counter-ion is mainly due to the stretching of the polymer chains. In this work, we provide a chemical route to further improve ZT in polymers and demonstrate a method of synthesis based on the electro-polymerization on gold. After removing the gold layer, a very thin semiconducting polymer film can be isolated.

Graphical abstract: Enhanced thermoelectric performance of PEDOT with different counter-ions optimized by chemical reduction

Back to tab navigation

Supplementary files

Article information


Submitted
27 Feb 2014
Accepted
12 Apr 2014
First published
15 Apr 2014

J. Mater. Chem. A, 2014,2, 10109-10115
Article type
Paper
Author version available

Enhanced thermoelectric performance of PEDOT with different counter-ions optimized by chemical reduction

M. Culebras, C. M. Gómez and A. Cantarero, J. Mater. Chem. A, 2014, 2, 10109
DOI: 10.1039/C4TA01012D

Social activity

Search articles by author

Spotlight

Advertisements