Enhanced thermoelectric performance by alcoholic solvents effects in highly conductive benzenesulfonate‐doped poly(3,4‐ethylenedioxythiophene)/graphene composites

Abstract

Benzenesulfonate-doped poly(3,4-ethylenedioxythiophene) (PEDOT-Bzs)/graphene thermoelectric (TE) composites with various graphene filler contents were synthesized in five different kinds of solvents. Dodecylbenzenesulfonic acid (DBSA) was used to achieve good dispersion of graphene into the PEDOT matrix. Among the synthesized PEDOT materials, the one synthesized in methanol (PEDOT-MeOH) had the highest electrical conductivity. X-ray photoelectron spectroscopy (XPS) analysis showed almost the same charge carrier concentration for all PEDOT materials. However, the X-ray diffraction (XRD) analysis highlighted the enhancement of PEDOT chain stacking by shorter-chain alcoholic solvents, as a result of which the carrier mobility and electrical conductivity were increased. The electrical conductivity and the Seebeck coefficient of the PEDOT/graphene composites were significantly improved with increasing the graphene content, which strongly depended on increased carrier mobility. The thermal conductivity of the composites exhibited relatively small changes, attributed to phonon scattering effects. The maximum TE efficiency of the PEDOTMeOH/graphene composite with 75 wt % graphene showed a substantially improved value of 1.9 3 10 22 , higher than that of the other PEDOT/graphene composites.

Modified PEDOT by benign preparing N-doped reduced graphene oxide as potential bio-electrode coating material

“…50,51 Furthermore, the peak appearing at 167.2 eV results from the neutralization of the positive charge of the S atoms in the PEDOT chains, which may be due to the electronegative oxygen atoms in the oxygen containing functional groups of N-rGO withdrawing electron density of the S atoms of PEDOT. [52][53][54] Therefore, the peak deconvolution of S indicates the intact PEDOT structure and the strong interaction of the two components in PEDOT/N-rGO.…”

Preparation and Characterization of Bi2Te3/Graphite/Polythiophene Thermoelectric Composites

“…6 In this regard, recent research has been mostly concentrated on TE composites consisting of inorganic conductive fillers and organic polymer matrixes, which have become promising alternatives to inorganic thermoelectric materials. 7,8 A composite material is made by combining two or more materials-often ones that have very different properties. The different materials work together to give the composite unique properties.…”