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Polymerization and characterization of high conductivity and good adhension polypyrrole films for electromagnetic interference shielding

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Abstract

Polypyrrole (PPy) shows a favorable application in the electromagnetic interference (EMI) shielding due to its good electrical conductivity and outstanding air stability. Conducting PPy films with high conductivity and good adhesion were successfully polymerized on the surface of insulating epoxy resin substrates using chemical polymerization. The factors affecting the properties of PPy films, such as the surface morphology, adhesion between PPy film and substrate, electrical conductivity, EMI shielding effectiveness (SE), were investigated. The adhesion was improved significantly through a three-step surface pretreatment of epoxy resin substrates including removing impurities, roughening, and surface modification with silane coupling agent. An enhancement in the conductivity of PPy films of about one order of magnitude was achieved by adding dopant in FeCl3 solution. The higher the conductivity, the better the shielding effectiveness. Taking sodium p-toluenesulfonate doped PPy film as example, EMI SE was in the practically useful range of about 30 dB over a wide frequency range from 30 MHz to 1500 MHz. The PPy film samples were characterized by scanning electron microscopy (SEM), infrared spectra (IR), X-ray photoelectron spectroscopy (XPS) and the flange coaxial transmission device. The four-point probe method was used to measure conductivity of PPy films.

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Authors and Affiliations

  1. Institute of Special Chemicals, Taiyuan University of Technology, Taiyuan, 030024, China

    Yong-sheng Qiao & Tao Dou

  2. School of Chemistry and Chemical Engineering, Shanxi Datong University, Datong, 037009, China

    Yong-sheng Qiao & La-zhen Shen  (沈腊珍)

  3. School of Electronic Information Engineering, Tianjin University, Tianjin, 300072, China

    Ming Hu

Authors
  1. Yong-sheng Qiao
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  2. La-zhen Shen  (沈腊珍)
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  3. Tao Dou
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  4. Ming Hu
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Corresponding author

Correspondence to La-zhen Shen  (沈腊珍).

Additional information

This work was financially supported by the National Natural Science Foundation of China (No. 60071027).

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Qiao, Ys., Shen, Lz., Dou, T. et al. Polymerization and characterization of high conductivity and good adhension polypyrrole films for electromagnetic interference shielding. Chin J Polym Sci 28, 923–930 (2010). https://doi.org/10.1007/s10118-010-9175-x

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  • DOI: https://doi.org/10.1007/s10118-010-9175-x

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