聚吡咯薄膜的制备及其氨气敏感特性的研究

Polypyrrole Film Fabrication with NH_3 Gas Sensing Properties

运用聚电解质自组装膜对基片表面进行化学改性,通过原位聚合法及自组装方法在基片表面沉积聚吡咯薄膜,利用紫外可见分光光度计(UV-Vis)和原子力显微镜(AFM)对聚吡咯薄膜进行了分析表征。采用平面叉指电极制备了PPy薄膜气体传感器,研究了其在常温下对有毒气体NH3的敏感性及对?30℃～+60℃温度范围内、5.9%R.H～59.6%R.H范围内的湿度其敏感特性的变化,讨论了薄膜沉积时间对气敏特性的影响。结果表明,该传感器对浓度为0～141ppm的NH3具有较高的灵敏度,对氨气的响应及恢复特性也很好,当沉积时间为20min时,该传感器的NH3敏感特性最好。

The self-assembled polyelectrolyte layers were used to modify the substrate surfaces for depositing polypyrrole films via in situ polymerization and self-assembly method. The properties of the films were characterized by ultraviolet-visible spectrophotometry （UV-Vis） and atomic force microscope （AFM）. The PPy films gas sensors using the interdigitated electrodes were fabricated, and the sensing properties to toxic gase NH3 at room temperature were studied. The results showed that the sensor could detect NH3 of 0 - 141 ppm concentrations with a high sensitivity and good response. And the effects of depositing time on the sensitivities were investigated, which showed that the best sensitivity was obtained with 20 min depositing. The sensitivities to temperature from -30℃ to ＋60℃ and humidity from 5.9% R.H to 59.6% R.H of the sensors were tested at last.