Comparison of electrical properties between multi-walled carbon nanotube and graphene nanosheet/high density polyethylene composites with a segregated network structure
Comparison of electrical properties between multi-walled carbon nanotube and graphene nanosheet/high density polyethylene composites with a segregated network structure
复制标题
具有隔离网络结构的多壁碳纳米管与石墨烯纳米片/高密度聚乙烯复合材料的电性能比较
DOI：
10.1016/j.carbon.2010.11.013
复制
发表时间：
2011-04-01
期刊：
影响因子：
10.9
通讯作者：
Liu, Chang
中科院分区：
文献类型：
--
作者：
Du, Jinhong;Zhao, Long;Liu, Chang
采用醇助分散-热压法制备了具有分离网络结构的多壁碳纳米管（MWCNT）/高密度聚乙烯（HDPE）和石墨烯纳米片（GNS）/HDPE复合材料。MWCNTs和GNS在聚合物基体中并不均匀分散，而是沿沿着特定的路径分布，形成了一个隔离的导电网络，导致复合材料的电渗流阈值较低。比较了GNS/HDPE和MWCNT/HDPE复合材料的电学性能，发现GNS/HDPE复合材料的逾渗阈值（1vol. %）比MWCNT/HDPE复合材料（0.15体积%）高得多，在相同填料含量下，MWCNT/HDPE复合材料的电导率高于GNS/HDPE复合材料。根据临界指数t的大小，两种复合材料可能具有不同的导电机制：MWCNT/HDPE复合材料代表三维导电体系，而GNS/HDPE复合材料代表二维导电体系。GNS作为导电填料对复合材料导电性能的改善效果远低于理论预期。(C)2010爱思唯尔有限公司版权所有。
Multi-walled carbon nanotube (MWCNT)/high density polyethylene (HDPE) and graphene nanosheets (GNS)/HDPE composites with a segregated network structure were prepared by alcohol-assisted dispersion and hot-pressing. Instead of uniform dispersion in polymer matrix, MWCNTs and GNSs distributed along specific paths and formed a segregated conductive network, which results in a low electrical percolation threshold of the composites. The electrical properties of the GNS/HDPE and MWCNT/HDPE composites were comparatively studied, it was found that the percolation threshold of the GNS/HDPE composites (1 vol.%) was much higher than that of the MWCNT/HDPE composites (0.15 vol.%), and the MWCNT/HDPE composite shows higher electrical conductivity than GNS/HDPE composite at the same filler content. According to the values of critical exponent, t, the two composites may have different electrical conduction mechanisms: MWCNT/HDPE composite represents a three-dimensional conductive system, while the GNS/HDPE composite represents a two-dimensional conductive system. The improving effect of GNSs as conducting fillers on the electrical conductivity of their composites is far lower than theoretically expected. (C) 2010 Elsevier Ltd. All rights reserved.