Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 4, Issue 14, Pages 5265-5273Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6ta00305b
Keywords
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Funding
- National Natural Science Foundation of China [51402134, 51463008, 51572117, 21563013, 61404062]
- natural science foundation of Jiangxi province [20142BAB216032, 20151BAB217024]
- Jiangxi Provincial Department of Education [GJJ1.50809]
- Jiangxi Science and Technology Normal University [2014QNBJRC001]
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For organic thermoelectric materials, a main challenge is to achieve high electrical conductivity and a large Seebeck coefficient, in order to improve the power factor. Here we suggest a simple way to address this issue through the addition of a small amount of liquid-phase exfoliated MoS2 nanosheets into poly(3,4-ethylenedioxythiophene): poly(4-styrenesulfonate) (PEDOT:PSS) solutions by direct vacuum filtration. The effects of exfoliated MoS2 nanosheets in common organic solvents on the thermoelectric properties of PEDOT: PSS were investigated. The organic solvent-assisted exfoliated MoS2 nanosheet solution was found to play an important role in improving the thermoelectric performance of the PEDOT: PSS thin film. Common organic solvents effectively removed some of the PSS during the formation of the film, resulting in a significantly enhanced electrical conductivity (1250 S cm(-1)) for the PEDOT: PSS/MoS2 (PM) thin film. On the other hand, the introduction of MoS2 nanosheets in PEDOT: PSS led to a slight increase of the Seebeck coefficient from 14.5 to 19.5 mu V K-1 without a significant reduction of the electrical conductivity of the PM thin film. An optimized power factor of 45.6 mu W m(-1) K-2 was achieved for the PM thin film with 4 wt% MoS2 exfoliated in an N,N-dimethylformamide (DMF) solution. The exfoliated MoS2 nanosheets in DMF exhibited a better effect on the thermoelectric performance of the PM composites than did those in other organic solvents. The method used here suggests a novel strategy for improving both electrical conductivity and the Seebeck coefficient, and hence optimizing the thermoelectric performance of the PEDOT: PSS thin film.
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