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Fabrication and gas sensitivity of polyaniline-titanium dioxide nanocomposite thin film

机译:聚苯胺-二氧化钛纳米复合薄膜的制备及气敏性

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摘要

A polyaniline-titanium dioxide (PANI/TiO_2) nanocomposite was prepared by an in-situ chemical oxidation polymerization approach in the presence of colloidal TiO_2 at room temperature, and the PANI/TiO_2 nanocomposite thin film was formed on a silicon substrate covered with interdigital electrodes to fabricate a gas sensor via the self-assembly method. The gas-responses of the PANI/TiO_2 thin film to NH_3 and CO toxic gases were examined. The results showed that the response, reproducibility and stability of the PANI/TiO_2 thin film to NH_3 were superior to CO gas. Compared with NH_3 and CO gases, humidity had less effect on the resistance of the PANI/TiO_2 thin film. It was also found that the difference between pure PANI and PANI/TiO_2 thin films was not only in gas-sensing property but also in surface morphology.
机译:在室温下,在胶态TiO_2存在下,通过原位化学氧化聚合法制备了聚苯胺-二氧化钛(PANI / TiO_2)纳米复合材料,并在覆盖有叉指电极的硅基板上形成了PANI / TiO_2纳米复合薄膜。通过自组装方法制造气体传感器。研究了PANI / TiO_2薄膜对NH_3和CO有毒气体的气体响应。结果表明,PANI / TiO_2薄膜对NH_3的响应,重现性和稳定性均优于CO气体。与NH_3和CO气体相比,湿度对PANI / TiO_2薄膜的电阻影响较小。还发现纯PANI和PANI / TiO_2薄膜之间的差异不仅在于气敏特性,而且在于表面形貌。

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