三维石墨烯/WO3纳米棒/聚噻吩复合材料制备及低温气敏性能

Preparation of Three Dimensional Graphene/WO3 Nanorod/Polythiophene Composites and Their Gas Sensing Properties at Low Temperature

采用两步法制备三维石墨烯/WO3纳米棒/聚噻吩(3D-rGO/WO3/PTh)三元复合材料,首先合成二元复合材料三维石墨烯/WO3纳米棒(3D-rGO/WO3),然后以此为载体,通过噻吩(PTh)单体的原位聚合得到最终产物。通过X射线衍射(XRD)、傅里叶红外光谱(FTIR)、场发射扫描电镜(FESEM)和透射电镜(TEM)对合成材料进行表征,研究了其低温气敏性能,分析了三元复合材料的气敏机理。结果表明,复合3D-rGO与PTh后三元复合材料的工作温度降低,75℃时对200 mg/L H2S的灵敏度达到25. 2,对H2S有较高的灵敏度,响应和恢复时间较短。

3 D-rGO/WO3/PTh ternary composites were synthesized by two-step method including the synthesis of 3 D-rGO/WO3 and the in-situ chemical oxidative polymerization of thiophene. The materials were studied by X-ray power diffraction( XRD),Fourier transform infrared spectrometer( FTIR),field emission scanning electron microscopy( FE-SEM) and transmission electron microscopy( TEM) techniques. The gas-sensing properties of the as-prepared composites were investigated,and the mechanism of ternary composites gas sensing was also proposed.The results show that the graphene and PTh adding can lower the working temperature and the 3 D-rGO/WO3/PTh can enhance the gas sensitivity. The sensitivity to 200 mg/L H2S can reach 25. 2 under the optimized working temperature of 75 ℃ and the response-recovery times become shorter.