In the present study, polyvinyl alcohol (PVA)/polypyrrole (WPPy)/vanadium pentoxide (V₂O₅) nanocomposite films were successfully synthesized by the solution casting method. The structural, optical, thermal and morphological properties of flexible PVA/WPPy/V₂O₅ nanocomposite films were investigated using Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), UV–vis spectroscopy (UV), thermogravimetric analysis (TGA), scanning electron microscopy (SEM) and atomic force microscopy (AFM). The mechanical property investigations of PVA/WPPy/V₂O₅ nanocomposite films revealed excellent flexibility and enhanced ultimate tensile strength. Furthermore, the sensing properties were evaluated to ascertain the effects of V₂O₅ on the sensitivity, selectivity, and response/recovery time of PVA/WPPy/V₂O₅ nanocomposite films. The maximum sensitivity (S) of 1.16% towards liquid petroleum gas (LPG) detection at a 600 ppm concentration at room temperature (RT) with response/recovery times of ~ 10/8 s was observed for nanocomposites with 15 wt% V₂O₅ loading in a PVA/WPPy blend matrix. The same composition of the nanocomposite film exhibit excellent selectivity for LPG over other tested volatile organic compounds (VOCs) such as acetone, benzene, xylene, and toluene. These results demonstrate that PVA/WPPy/V₂O₅ nanocomposite film with 15 wt% V₂O₅ loading is an ideal material as a chemiresistive sensor for the qualitative detection of LPG.

在本研究中，通过溶液流延法成功地合成了聚乙烯醇（PVA）/聚吡咯（WPPy）/五氧化二钒（V ₂ O ₅）纳米复合膜。使用傅立叶变换红外光谱（FTIR），X射线衍射（XRD），紫外可见光谱（UV），热重分析法研究了柔性PVA / WPPy / V ₂ O ₅纳米复合膜的结构，光学，热学和形貌特性（TGA），扫描电子显微镜（SEM）和原子力显微镜（AFM）。PVA / WPPy / V ₂ O ₅的力学性能研究纳米复合膜显示出优异的柔韧性和增强的极限拉伸强度。此外，评估了感测性能以确定V ₂ O ₅对PVA / WPPy / V ₂ O ₅纳米复合膜的灵敏度，选择性和响应/恢复时间的影响。对于含15 wt％V ₂ O的纳米复合材料，在室温（RT）浓度为600 ppm时，响应/恢复时间约为10/8 s，对液态石油气（LPG）检测的最大灵敏度（S）为1.16％。₅加载到PVA / WPPy混合矩阵中。相同成分的纳米复合材料薄膜对LPG的选择性优于其他经过测试的挥发性有机化合物（VOC），例如丙酮，苯，二甲苯和甲苯。这些结果表明，具有15 wt％V ₂ O ₅负载的PVA / WPPy / V ₂ O ₅纳米复合膜是用于定性检测LPG的理想化学传感器。