Fabrication and characterization of polyaniline-based gas sensor by ultra-thin film technology
Fabrication and characterization of polyaniline-based gas sensor by ultra-thin film technology
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DOI：
10.1016/s0925-4005(01)00946-7
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发表时间：
2002-01
影响因子：
8.4
通讯作者：
D. Xie;Yadong Jiang;W. Pan;Dan Li;Zhiming Wu;Yanrong Li
中科院分区：
文献类型：
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作者：
D. Xie;Yadong Jiang;W. Pan;Dan Li;Zhiming Wu;Yanrong Li
采用Langmuir-Blodgett （LB）和自组装（SA）技术制备了纯聚苯胺（PAN）薄膜、聚苯胺与乙酸（AA）混合薄膜以及PAN与聚苯乙烯磺酸（PSSA）不同层数的复合薄膜。利用紫外可见光谱和椭偏仪对这些超薄膜进行了表征。结果表明，pan基超薄膜的厚度随膜层数的增加而线性增加。研究了不同层数的超薄膜对no2的气敏性。发现LB法制备的纯聚苯胺膜对NO2具有良好的敏感性，而SA膜则具有较快的恢复性能。超薄膜对no2的响应时间和电阻的相对变化随膜层数的增加而增加。LB法制备的三层PAN膜对20ppm no2的响应时间约为10s，两层SA膜对20ppm no2的响应时间约为8s。讨论了pan基超薄膜对no2敏感的机理。
Pure polyaniline (PAN) film, polyaniline and acetic acid (AA) mixed film, as well as PAN and polystyrenesulfonic acid (PSSA) composite film with various number of layers were prepared by Langmuir–Blodgett (LB) and self-assembly (SA) techniques. These ultra-thin films were characterized by ultraviolet–visible (UV–VIS) spectroscopy and ellipsometry. It is found that the thickness of PAN-based ultra-thin films increases linearly with the increase of the number of film layers. The gas-sensitivity of these ultra-thin films with various layers to NO2was studied. It is found that pure polyaniline films prepared by LB technique had good sensitivity to NO2, while SA films exhibited faster recovery property. The response time to NO2and the relative change of resistance of ultra-thin films increased with the increase of the number of film layers. The response time of three-layer PAN film prepared by LB technique to 20ppm NO2was about 10s, two-layer SA film was about 8s. The mechanism of sensitivity to NO2of PAN-based ultra-thin films was also discussed.