碳纳米管的表面修饰及其对碳纳米管/氟橡胶复合材料导电性能的影响
Surface modification of carbon nanotube and its influence on the conductivity property of carbon nanotube/fluoro-elastomer composite
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摘要: 分别采用混酸和四氟化碳(CF4 ) 等离子体处理技术对碳纳米管(MWCNTs) 进行了表面修饰, 将处理前后的碳纳米管进行了XPS 和SEM 测试, 获得了处理后前的表面形貌和结构, 并采用溶液浇注的方式制备了MWCNTs/氟橡胶(FE) 复合材料, 探讨了不同碳纳米管状态(未处理、混酸处理、CF4等离子体处理) 的导电性能, 结果表明两种表面处理方式可以使MWCNTs 表面接上极性官能团。而且在相同的碳纳米管添加量下(质量分数分别为0. 1 %、0. 5 %、1. 0 %、2. 0 %) , 酸处理MWCNTs/ FE 的渗流阈值最小, 达0. 5 %。Abstract: Multiwall carbon nanotubes (MWCNTs) were modified by mixed acid and tet rafluoro carbon (CF4 ) plasma treatment. The surface morphology and structure of MWCNTs before and after treatment were obtained by using SEM and XPS, which revealed that MWCNTs can be grafted by polar groups after surface treatment. Furthermore, MWCNTs/fluoro-elastomer ( FE) composite films were prepared by the method of solution casting using untreated MWCNTs (UCNTs) , acid-modified MWCNTs (ACNTs) and CF4 plasma-modified MWCNTs (FCNTs). In each case, MWCNTs mass fractions were 0. 1 % , 0. 5 %, 1. 0 % and 2. 0 % with respect to the polymer. The conductivity of MWCNTs/FE was studied by comparing the modification effect on MWCNTs. The results show that the lowest percolation threshold in acid-modified MWCNTs/FE composites was about 0. 5 %.
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Key words:
- carbon nanotubes /
- surface modification /
- composite /
- conductivity
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