多壁碳纳米管/硅橡胶复合材料的湿度敏感特性

Humidity sensitive behavior of multi-walled carbon nanotube/ silicon rubber composite materials

采用多壁碳纳米管和硅橡胶制备多壁碳纳米管/硅橡胶复合材料。研究了该复合材料的导电网络和湿敏特性。通过透射电镜观察经过化学修饰和未修饰的多壁碳纳米管的表面形貌,扫描电镜观察多壁碳纳米管/硅橡胶复合材料形成的导电网络结构;分析该复合材料的导电机理,研究多壁碳纳米管/硅橡胶感湿特性。结果表明,相对湿度在11%～98%的范围,经过修饰后的多壁碳纳米管/硅橡胶湿度传感器的灵敏度为0.03469/%RH,而且该复合材料具有响应时间短和重复性好的特点,是比较理想的新型湿度敏感材料,可以在多种湿度环境的检测中获得广泛的应用。

The electric network and humidity sensing property of the multiwall carbon nanotube/silicon rubber composite materials under investigation were manufactured by using the multi-wall carbon nanotube and silicon rubber. Surface morphology of chemically modified and non-modified multiwalled carbon nanotube was exam- ined by scanning electronic microscope. The electric network structure of the multi-wall carbon nanotube/silicon rubber was examined by transmission electron microscope. The electric mechanism of the multiwall carbon nanotube/silicon rubber composite materials was analyzed. The humidity sensing property the multiwall carbon nanotube/silicon rubber was studied. Results show that in the range of 11%-98% relative humidity, the humid- ity sensor of modified multi-wall carbon nanotube has a humidity sensitivity of about 0. 03469/% RH. Moreover, the modified humidity sensors showed faster the response and better repeatability. The humidity sensitivity of the multi-wall carbon nanotube/silicon rubber composites materials indicates it promise as a kind of humidity sensitive material. It obtains a wide range of applications of humidity environment detection.