聚苯胺纳米小球的光电化学性能研究

Study on photoelectrochemical performance of polyaniline nanospheres

目前二维材料,如黑磷等的低光电响应能力以及环境不稳定性严重影响了其实际使用,而导电聚合物因质轻、耐腐蚀以及优异的半导体电学和光学特性等优势,在传感器、光伏器件和场效应晶体管等领域表现出巨大的潜在应用前景。本工作通过化学氧化聚合法制备尺寸均一的聚苯胺(PAN)纳米小球,并通过溶液沉积法在氧化铟锡玻璃表面制备PAN纳米小球的光电化学工作电极,以研究其光电化学响应性能。利用扫描电子显微镜(SEM)和透射电子显微镜(TEM)表征及探讨所制备的PAN纳米小球的形貌和尺寸;利用傅里叶变换红外光谱仪(FT-IR)和热重分析仪(TGA)分别表征所制备的PAN纳米小球的化学结构和热稳定性;采用光电化学测试系统对所制备的PAN纳米小球进行光电化学响应性能的系统评估。结果表明:制备的PAN纳米小球尺寸均一,光电化学响应能力强(3.62μA·cm^(-2)),响应速度快(1.1 s)并赋有优异的环境稳定性,为高性能导电聚合物的光电化学纳米器件的开发提供理论基础和实际意义。

The poor photoresponse properties and environmental instabilities of two-dimensional materials,such as black phosphorus,has seriously limited their practical applications,while conductive polymers have shown great potential applications in the fields of sensors,photovoltaic devices and field-effect transistors due to their advantages of light weight,corrosion resistance and both excellent electrical and optical properties of semiconductor materials.In this work,the uniform polyaniline(PAN)nanospheres were successfully synthesized by chemical oxidization polymerization,and were deposited onto an indium tin oxide(ITO)-coated glasses by direct solution deposition,to fabricate a working electrode in a photoelectrochemical cell for their studies on photoelectrochemical performance.Scanning electron microscopy(SEM)and transmission electron microscopy(TEM)were employed to characterize the morphology and size of the as-prepared PAN nanospheres.Fourier transform infrared(FT-IR)spectrometer and thermal gravimetric analysis(TGA)were conducted to characterize the chemical structure and thermal stability of the as-prepared PAN nanospheres,respectively.The photoelectrochemical workstation was utilized to systematically evaluate the photoresponse performance of the as-prepared PAN nanospheres.The results demonstrated that the as-synthesized PAN nanospheres had uniform size,strong photoresponse ability(3.62μA·cm^(-2)),fast response speed(1.1 s)and excellent environmental stability,which provided theoretical basis and practical significance for developing high-performance conductive polymer-based nanodevices.