Acta Phys. -Chim. Sin. ›› 2006, Vol. 22 ›› Issue (10): 1185-1190.doi: 10.3866/PKU.WHXB20061003

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Study on Conductive Mechanism of Composites―Sulfonated Polyphenylacetylene / Multiwalled Carbon Nanotubes

BIAN Cheng-Xiang;XU Xue-Cheng;YU Wei;CHEN Yi-Wei;CHENG Rong-Ming;SHI Yan;LI Xiang-Mei;JIN Sheng-Song   

  1. Center of Functional Nanomaterials and Devices, East China Normal University, Shanghai 200062, P. R. China; Department of Physics, East China University of Science and Technology, Shanghai 200237, P. R. China; Key Laboratory for Ultrafine Materials of Ministry of Education, Institute of Materials Science and Engineering,East China University of Science and Technology, Shanghai 200237, P. R. China
  • Received:2006-03-13 Revised:2006-04-27 Published:2006-10-11
  • Contact: XU Xue-Cheng E-mail:xcxu@phy.ecnu.edu.cn

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Abstract: Composites—sulfonated polyphenylacetylene/multiwalled carbon nanotubes (SPPA/MWNT) were prepared by mixing SPPA with MWNT in an ultrasonic bath. The conductive mechanism of SPPA/MWNT was studied by four-probe, field emission scanning electron microscope (FESEM), UV-Vis, XPS, and XRD. The results showed that there were two obvious increases of electrical conductivity, the dopant (MWNT) had a low percolation threshod, the MWNT was discontinuously dispersed in the composites when reaching the percolation threshold, and the resistance of the composites showed a negative temperature coefficient (NTC). XPS、UV-Vis, and XRD results indicated that SPPA was doped by the carbon atom of MWNT in the composites. The conductive mechanism of the composites was inferred as follows: there were two kinds of conductive networks, one was formed by doped SPPA contacting with each other , the other was formed by MWNT contacting with each other, since the conjugated polymer (SPPA) can be not only filled by MWNT, but also be doped by the carbon atoms of the MWNT.

Key words: SPPA, MWNT, Composites, Conductivity, Fill, Doping