物理化学学报 >> 2006, Vol. 22 >> Issue (10): 1185-1190.doi: 10.3866/PKU.WHXB20061003

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磺化聚苯乙炔/多壁碳纳米管复合材料导电机理研究

边成香;徐学诚;余维;陈奕卫;成荣明;石岩;李相美;晋圣松   

  1. 华东师范大学纳米功能材料与器件研究中心, 上海 200062; 华东理工大学物理系, 上海 200237; 华东理工大学材料科学与工程学院, 超细材料制备与应用教育部重点实验室, 上海 200237
  • 收稿日期:2006-03-13 修回日期:2006-04-27 发布日期:2006-10-11
  • 通讯作者: 徐学诚 E-mail:xcxu@phy.ecnu.edu.cn

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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摘要： 将磺化聚苯乙炔(SPPA)与多壁碳纳米管(MWNT)超声共混制备得到SPPA/MWNT复合材料. 用四探针电阻率测试、场发射扫描电镜(FESEM)、XPS、UV-Vis、XRD等方法对复合材料导电机理进行研究. 结果表明, SPPA/MWNT的电导率发生两次突跃；掺杂剂MWNT具有低的临界阈值; 临界阈值附近, 复合材料中MWNT具有不连续分布的现象及复合材料电阻呈负温度系数(NTC)效应; SPPA/MWNT复合材料中MWNT的碳原子对SPPA 进行掺杂. 推测复合材料的导电机理为, 共轭聚合物SPPA不仅被导电粒子MWNT物理填充, 同时还被MWNT的碳原子掺杂, 使复合材料中存在两种导电通路而导电, 一是因被掺杂而成为高电导率主体的SPPA相互接触形成的导电通路, 二是MWNT相互接触形成的导电通路.

关键词: 磺化聚苯乙炔, 多壁碳纳米管, 复合材料, 导电, 填充, 掺杂

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