高灵敏度和选择性以及短响应和恢复时间对于实际导电聚合物气体传感器是重要的。然而,稳定性差,选择性差,和长的响应时间显著限制了单相导电聚合物的适用性,如聚吡咯(PPy)。在这项研究中,通过化学聚合和机械共混法制备了PPy/MoS2复合薄膜,和由铜加热组成的柔性薄膜电阻NO2传感器,芴聚酯绝缘,使用柔性电子打印机在柔性聚酰亚胺基板上制造具有银叉指电极的PPy/MoS2传感层。利用X射线衍射对PPy/MoS2复合薄膜进行了表征,傅里叶变换红外光谱,场发射扫描电子显微镜。建立了自制的气敏测试平台,以确定复合薄膜传感器的电阻随温度和气体浓度的变化。PPy/MoS2传感器表现出更好的灵敏度,选择性,和稳定性比纯PPy传感器。在150°C时,其对50ppmNO2的响应为38%,即,比纯PPy传感器高26%,选择性和稳定性也较高。更高的灵敏度归因于MoS2掺杂后p-n异质结的形成和更多的气体吸附位点。因此,PPy/MoS2复合薄膜传感器具有良好的应用前景。
High sensitivity and selectivity and short response and recovery times are important for practical conductive polymer gas sensors. However, poor stability, poor selectivity, and long response times significantly limit the applicability of single-phase conducting polymers, such as
polypyrrole (PPy). In this study, PPy/MoS2 composite films were prepared via chemical polymerization and mechanical blending, and flexible thin-film resistive NO2 sensors consisting of copper heating, fluorene polyester insulating, and PPy/MoS2 sensing layers with a silver fork finger electrode were fabricated on a flexible polyimide substrate using a flexible electronic printer. The PPy/MoS2 composite films were characterized using X-ray diffraction, Fourier-transform infrared spectroscopy, and field-emission scanning electron microscopy. A home-built gas sensing test platform was built to determine the resistance changes in the composite thin-film sensor with temperature and gas concentration. The PPy/MoS2 sensor exhibited better sensitivity, selectivity, and stability than a pure PPy sensor. Its response to 50 ppm NO2 was 38% at 150 °C, i.e., 26% higher than that of the pure PPy sensor, and its selectivity and stability were also higher. The greater sensitivity was attributed to p-n heterojunction formation after MoS2 doping and more gas adsorption sites. Thus, PPy/MoS2 composite film sensors have good application prospects.