聚吡咯／二氧化钛复合薄膜的制备及气敏性研究

Fabrication and Gas Sensitivity Study of Polypyrrole/Titanium Oxide Composite Thin Films

运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,并进行了紫外-可见光谱分析和原子力显微镜分析．采用平面叉指电极制备了PPy／TiO2复合薄膜气体传感器,研究了其在常温下对有毒气体NH3和CO的敏感性．最后测试了该传感器的温度湿度特性．结果表明,该传感器对NH3具有较高的灵敏度,对CO几乎没有响应．同时讨论了复合薄膜沉积时间对气敏特性的影响,实验表明当沉积时间为20min时,该传感器的NH3敏感特性最好．

Polypyrrole/Titanium Oxide （PPy/TiO2） nanocomposite thin films prepared by in situ chemical oxidation polymerization and electrostatic self-assembly combined technique were investigated. The films were characterized with UV-Vis spectroscope and atomic force microscope. With the assistance of interdigitated electrodes, gas sensors using PPy/TiO2 nanocomposite thin films were achieved. The sensitivities of sensors to toxic gases NH3 and CO at room temperature were studied. Temperature and humidity sensitive properties were also tested. The results show that the sensor can detect NH3 with high sensitivity, whereas can not recognize CO almost. The investigation of the effects of film depositing time .on sensor sensitivities shows that the sensors with the composite thin film deposited for 20min possess the highest sensitivity to NH3.