PPy-CeO_2复合薄膜柔性NO_2传感器的制备与气敏特性研究

Preparation and Gas-Sensing Properties Investigation of Flexible NO_2 Sensor Based on PPy-CeO_2 Composite Thin Film

以吡咯(Py)单体为前驱液,六水合三氯化铁(FeCl_3·6H_2O)为氧化剂,通过化学氧化聚合法与自组装相结合工艺在柔性聚酰亚胺(PI)衬底上制备聚吡咯-二氧化铈(PPy-CeO_2)复合薄膜。通过紫外-可见吸收光谱(UV-Vis)、傅立叶红外光谱(FTIR)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)及X射线衍射(XRD)、X射线电子能谱分析(XPS)对纯PPy和PPyCeO_2复合材料进行了表征分析,结果表明PPy-CeO_2呈典型的核-壳结构。在室温条件下研究了纯PPy薄膜和PPy-CeO_2复合薄膜对二氧化氮(NO2)的响应特性,结果表明,PPy-CeO_2复合薄膜传感器显示出更优的响应特性,灵敏度为纯PPy薄膜传感器的12.6倍,且具有良好的重复性和选择性。最后讨论分析了PPy-CeO_2复合薄膜传感器的NO2敏感机理。

Polypyrrole-cerium dioxide（PPy-CeO2） composite thin film on polyimide（PI） flexible substrate was prepared by combining the chemical oxidation polymerization with self-assembly method using pyrrole（Py） as precursor and FeCl3·6 H2O as oxidizing agent. The obtained PPy and PPy-CeO2 were characterized and analyzed by Ultraviolet-visible absorption spectrometer（UV-Vis）,Fourier transform infrared spectroscopy（FTIR）,Scanning electron microscope（SEM）,Transmission electron microscope（TEM） and X-ray diffraction（XRD）,X ray electron spectroscopy analysis（XPS）.The results showed that PPy-CeO2 exhibited a typical core-shell structure. The NO2-sensing properties of pure PPy and PPy-CeO2 composite thin film sensors were investigated at room temperature,and the results indicated that the composite thin film sensor showed the superior response characteristics. The sensitivity is 12. 6 times larger than that of pure PPy film one. Furthermore,the PPy-CeO2 film sensor possessed good repeatability and selectivity. Finally,the NO2-sensingmechanism of PPy-CeO2 film sensor was analyzed and discussed.