Abstract
Exploiting the thermal insulation properties of glass fiber and excellent conductivity of conducting polymer, a novel one-dimensional (1D) composite thermoelectric material, based on poly(3,4-ethylenedioxythiophene): p-toluenesulfonic acid (PEDOT: p-TSA)/glass fiber, is prepared by coating the PEDOT: p-TSA on the surface of glass fiber with in situ polymerization method. We hope the materials can bring out the performance of the “electron conductor, photon glass”. During the polymerization process, the effects of oxidant concentration and dopant mass fraction on thermoelectric properties of the materials are investigated. The group type of the polymer chain and the morphology of the samples were characterized by Fourier transform infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM), respectively. The maximal Seebeck coefficient (S) and electric conductivity (σ) of the pristine sample are 32 μVK-1 and 169 Sm-1, respectively. After further post-processing with methanol, the thermoelectric properties of materials were improved, and the maximum value of S and σ increased greatly to 48.5 μVK-1 and 3184 Sm-1, respectively. The maximal power factor (PF) of materials also increased from 0.12 μWm-1 K-2 to 6.74 μWm-1 K-2. Moreover, we have proposed a preliminary explanation on the carrier transport mechanism.
Highlights
The group type of the polymer chain and the morphology of the samples were characterized by Fourier transform infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM), respectively
Preparation the 1D organic thermoelectric materials of PEDOT: p-TSA/glass fiber, which involves the following procedures: 1) EDOT was distilled under vacuum (0.095 KPa, 102 ̊C) and the purity of EDOT reached to 99.9%. 2) Preparation of APS solution with different concentrations, 5, 7, 9, 11, 13, 15 mmol∙L−1∙, respectively
The powder sample of pristine PEDOT: p-TSA is obtained according to the method of solution polymerization
Summary
Thermoelectric materials have attracted increasing attention, which are envi-. The performance of thermoelectric (TE) materials is generally evaluated by the dimensionless figure of merit, ZT = S 2σT κ , where S is the Seebeck coefficient, σ and κ are the electrical and thermal conductivity, respectively. The quantum wire of the 1D thermoelectric materials could further improve the density of state (DOS) near the Fermi level than the quantum wells [4]. The ZT of one-dimensional thermoelectric materials may be larger than that of the bulk and two-dimensional thin film. The maximal ZT of PEDOT: PSS film of p-type and poly[Kx (Ni-ett)] of n-type thermoelectric materials are 0.42 [5] and 0.2 [6], respectively. The maximum of ZT for 1D thermoelectric materials is not definite
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