Awasthi Seema, Awasthi Kalpana, Kumar Rajesh, Srivastava O N
Banaras Hindu University, Varanasi 221005, India.
J Nanosci Nanotechnol. 2009 Sep;9(9):5455-60. doi: 10.1166/jnn.2009.1160.
Multi-walled carbon nanotubes (MWNTs)-polyacrylamide (PAM) composites have been prepared using as purified, with ball milling and functionalized MWNTs by solution cast technique and characterized through scanning electron microscopy (SEM) and transmission electron microscopy (TEM). A comparative study has been made on the electrical property of these MWNTs-PAM composites with different MWNTs loadings. It has been shown that the ball milling and functionalization of MWNTs improves the dispersion of MWNTs into the polymer matrix. As the MWNTs loading increases from 0 to 40 wt% electrical conductivity of composite film increases by approximately 7 orders of magnitude whereas the electrical conductivity of functionalized composite film increases only approximately 4 orders of magnitude with respect to the pure PAM film. A model based on power law percolation for the electronic behavior of above composite has been developed and shows good agreement with the experimental data.
多壁碳纳米管（MWNTs）-聚丙烯酰胺（PAM）复合材料已通过溶液浇铸技术制备而成，其中使用的多壁碳纳米管经过纯化、球磨和功能化处理，并通过扫描电子显微镜（SEM）和透射电子显微镜（TEM）进行了表征。对这些不同多壁碳纳米管负载量的MWNTs-PAM复合材料的电学性能进行了比较研究。结果表明，多壁碳纳米管的球磨和功能化处理改善了多壁碳纳米管在聚合物基体中的分散性。随着多壁碳纳米管负载量从0增加到40 wt%，复合薄膜的电导率增加了约7个数量级，而功能化复合薄膜相对于纯PAM薄膜，其电导率仅增加了约4个数量级。已开发出一种基于幂律渗流的上述复合材料电子行为模型，该模型与实验数据吻合良好。
