单壁碳纳米管-聚合物复合导电薄膜的制备

Preparation of a polymer-based conductive film filled with single-walled carbon nanotubes

摘要: 基于聚合物乳液法，将单壁碳纳米管（SWCNTs）在阿拉伯树胶溶液中经过超声波振荡剥离后，与聚合物乳液直接混合，然后在室温下成膜，制备出了电渗流阈值为0.03%的SWCNTs苯丙乳液复合导电薄膜，研究了SWCNTs在聚合物中形成导电网络的过程。TEM观察表明：在超声波和阿拉伯树胶溶液的共同作用下，单壁碳纳米管首先由束状被剥离成单根；进一步作用后其表面被缠绕包覆了一层阿拉伯树胶分子；添加其到聚合物乳液中，当添加量达到渗流阈值时，在聚合物乳液的成膜过程中SWCNTs会互相连接形成导电网络。

Abstract: A single-walled carbon nanotube (SWCNT) filled styrene-acrylate latex conductive film was prepared using a polymer-latex-based technology. SWCNTs were dispersed in a gum arabic(GA) water solution by means of sonication, and mixed with styrene-acrylate latex to form a conductive composite film after drying at room temperature. The formation of a conductive network of SWCNTs in the polymer matrix was also studied. TEM images showed that SWCNTs were effectively dispersed from bundles to single tubes under the sonication in the GA solution and the surfaces of the SWCNTs were wrapped by GA molecules. The percolation threshold concentration of SWCNTs was as low as 0.03%, when they formed a conductive network.