碳纳米管/聚合物复合材料薄膜制备及其压阻特性研究

Study on Preparation and Resistivity-strain Dependence of Carbon Nanotube/polymer Composite Thin Films

基于真空过滤方法获得均匀的不同厚度碳纳米管薄膜,通过与聚合物基体的润湿固化转移碳纳米管薄膜制备压阻敏感度可控的复合材料薄膜.并研究了该薄膜的压阻特性.结果表明薄膜的压阻敏感度随着初始碳纳米管悬浮液体积的减小而降低,当体积减小到一定程度时,薄膜压阻敏感度反而增加,但是线性范围减小.碳纳米管/聚合物复合材料的这种压阻特性,一方面了说明了碳纳米管与聚合物复合材料薄膜压阻效应的可控性;另一方面,也表明了通过调节压阻敏感度,该复合材料既可用作应变传感,又可以用作对变形不敏感的导电薄膜.

A carbon nanotube/polymer conductive composite material has been fabricated by vacuum filtration and flexible transfer methods.The vacuum filtration method was utilized to obtain carbon nanotube networks with controllable density and thickness,and then the networks were transferred to polymer to form composite layers.Resistivity-strain dependence of these thin films with different initial volume of dilute suspension filtered through the membrane was measured.The results show that the thin films with thinner CNTs networks exhibit weaker resistance-strain sensitivity under the same stain and the strain sensing material shows resistance-strain sensitivity depending only on the initial CNTs suspension volume.While as the initial volume decrease to a value,the sensitivity will increase dramatically.It is indicated that the resistivity-strain sensitivity of the CNT/PDMS composite thin film is controllable,which can be used for strain sensing and conductive layers.