Conductive polymers such as poly(3,4-ethylenedioxythiophene) (PEDOT) meet a wide range of applications as transparent electrodes, hole injecting layers or thermoelectric materials for low temperature applications[1]. Here we present the synthesis of highly conductive PEDOT using iron(III)trifluoromethanesulfonate as oxidant. Low temperature electrical conductivity measurements showed that the polymer exhibits a true metallic behaviour which is even strengthened by an acid doping step leading to conductivities higher than 3000 S cm-1 at an unprecedented 45.5 % oxidation state. X-ray photoemission spectroscopy (XPS) and time of flight - secondary ion mass spectrometry (ToF-SIMS) analyses demonstrate a full exchange of the trifluoromethanesulfonate anions by hydrogen sulfate counterions after doping with sulfuric acid. The 80 % increase of the electrical conductivity obtained with this treatment is explained by the enhancement of both the charge carrier concentration and the mean size of the crystalline domains, as determined in particular by GIWAXS synchrotron experiments.[2] The use of these new high performance metallic polymers in printed electronics would significantly extend the range of possible applications. [1] Nicolas Massonnet, Alexandre Carella, Olivier Jaudouin, Patrice Rannou, Gautier Laval, Caroline Celle and Jean-Pierre Simonato. Improvement of the Seebeck coefficient of PEDOT:PSS by chemical reduction combined with a novel method for its transfer using free-standing thin films. J. Mater. Chem. C 2014, 2, 1278 [2] Nicolas Massonnet, Alexandre Carella, Arnaud de Geyer, Jérôme Faure-Vincent and Jean-Pierre Simonato. Metallic behaviour of acid doped highly conductive polymers Chem. Science, 2015, 6, 412

Conductive and thermoelectric materials based on PEDOT

251st National Meeting (2016)

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