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On the mechanism of conductivity enhancement in PEDOT/PSS film doped with multi-walled carbon nanotubes

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Abstract

The results of conductivity investigation of poly(3,4-ethylenedioxythiophene)/poly(styrene sulfonic acid) (PEDOT/PSS) thin films doped with different multi-walled carbon nanotubes (MWCNTs) concentrations were studied. The role of MWCNTs as a conductive filler on the mechanism of conductivity enhancement in the composite film was further investigated by X-ray diffraction (XRD), Fourier transform Roman spectroscopy (FT-RM), X-ray photoelectron spectroscopy (XPS) and Atomic force microscopy (AFM). The increase of the conductivity is likely to be due to two effects, the “π-π interaction” effect and the “channel” effect. The former is π-π interaction between the thiophene rings of PEDOT backbone and MWCNTs, and the electronic density transfer occurs from PEDOT to MWCNTs in M-PEDOT/PSS, so that the charge becomes more delocalized on the PEDOT chains. The latter stems from the formation of some conductive MWCNTs channels in the PEDOT/PSS matrix. These two effects can help charge transport and enhance the conductivity of composite films.

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Acknowledgments

Financial support from the program for New Century Excellent Talents in University (NCET, Grant No. NCET-04-0648) is gratefully acknowledged.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Shandong University of Technology, Zibo, 255049, People’s Republic of China

    Jiao Li & Jun-Cheng Liu

  2. College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao, 266003, People’s Republic of China

    Jiao Li & Cong-Jie Gao

Authors
  1. Jiao Li
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  2. Jun-Cheng Liu
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  3. Cong-Jie Gao
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Correspondence to Jun-Cheng Liu.

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Li, J., Liu, JC. & Gao, CJ. On the mechanism of conductivity enhancement in PEDOT/PSS film doped with multi-walled carbon nanotubes. J Polym Res 17, 713–718 (2010). https://doi.org/10.1007/s10965-009-9360-1

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  • DOI: https://doi.org/10.1007/s10965-009-9360-1

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