三维石墨烯/In2O3/聚吡咯复合材料制备及室温气敏性能

Preparation of Three Dimensional Graphene/In2O3/Polypyrrole Composites and Its Gas Sensitivity at Room Temperature

采用两步法制备三维石墨烯/In2O3/聚吡咯(3D-rGO/In2O3/PPy)三元复合材料,首先合成二元复合材料三维石墨烯/In2O3(3D-rGO/In2O3),然后以此为载体,通过吡咯单体的原位聚合得到最终产物。通过XRD、FTIR、FESEM、TEM和氮气吸附-脱附对合成材料进行表征,研究了其室温气敏性能,分析了三元复合材料的气敏机理。结果表明,复合3D-rGO与PPy后,三元复合材料的工作温度降低至室温,室温时对200ppmNH3的灵敏度达到18.8,对NH3有较高的灵敏度,响应和恢复时间较短。

3D-rGO/In2O3/PPy ternary composites were synthesized by two-step method including the synthesis of 3D-rGO/In 2O3 and the in-situ chemical oxidative polymerization of pyrrole.The materials were studied by X-ray power diffraction(XRD),Fourier transform Infrared spectrometer(FTIR),field emission scanning electron microscopy(FE-SEM),transmission electron microscopy(TEM)and N2 adsorption-desorption.The gas sensitivity of the as-prepared composites were investigated,and the mechanism of ternary composites gas sensitivity was also proposed.The results show that the graphene and PPy adding can lower the working temperature and the 3D-rGO/In2O3/PPy can enhance the gas sensitivity.The sensitivity to 200ppm NH3 can reach 18.8 at the room temperature and the response-recovery times become shorter.