聚吡咯/二氧化钛复合氨敏薄膜的制备及特性研究

采用静电力自组装和原位化学氧化聚合相结合的方法制备了聚吡咯/纳米二氧化钛(PPy/TiO2)复合薄膜，并进行了表面电阻测试及紫外–可见光谱分析、原子力显微镜分析。利用平面叉指电极结构制备了PPy和PPy/TiO2薄膜气体传感器，研究了其在常温下对有毒气体NH3的敏感性。结果表明，相同条件下PPy/TiO2复合薄膜传感器的响应/恢复时间均优于PPy薄膜传感器。同时测试了PPy/TiO2复合薄膜传感器的湿度特性和稳定性。

Polypyrrole (PPy)/TiO2 nanocomposite thin films were fabricated by electrostatic self-assembly and in situ chemical oxidation polymerization combined technique. The surface resistances of PPy/TiO2 thin films were measured, and the films were characterized by UV-vis spectroscopy and Atomic Force Microscopy (AFM). With the assistance of interdigitated electrodes the gas sensors using PPy and PPy/TiO2 thin films were achieved. The sensitivities of sensors to toxic gases NH3 at room temperature were studied. The results show that the response/ recovery time of PPy/TiO2 composite thin films gas sensor were superior to those of PPy thin film sensor under the same condition. At the same time, the humidity sensitive properties and stability of PPy/TiO2 composite thin films gas sensor were tested.