NiO/In2O3纳米复合材料的制备及气敏性能研究

Synthesis and gas-sensing properties of NiO/In2O3 nanocomposites

采用水热法结合水浴法制备出了NiO/In2O3纳米复合材料,利用扫描电子显微镜(SEM)、透射电子显微镜(TEM)和X射线衍射仪(XRD)等对其微观形貌和晶相进行表征分析。表征结果表明,制备所得In2O3纳米微球直径为200~300 nm,其表面均匀包覆厚度约为20 nm的NiO纳米片。气敏测试结果表明,基于NiO/In2O3异质结纳米复合材料的气体传感器对甲醛的最佳工作温度为220℃;在最佳工作温度下,对浓度为1×10^-5的甲醛气体响应可达到20,响应/恢复时间分别为4 s/16 s,且具有较好的重复性和选择性。最后,对分级结构及p-n异质结对其气敏机理进行了探讨。

In this paper,NiO/In2O3 nanocomposites were prepared by hydrothermal and water bath method.The nanocomposites were characterized by scanning electron microscope(SEM),transmission electron microscope(TEM)and X-ray diffraction(XRD).Characterization results show that the NiO nanosheets were uniformly grown on the surface of In2O3 nanospheres with the diameter of 200-300 nm,and the thickness of NiO nanosheets was about 20 nm.Gas-sensing tests exhibit that the sensor response to 10×10^-6 formaldehyde was about 20 at 220 oC with the fast response time(about 4 s)and recovery time(about 16 s),and good reproducibility and selectivity.Some possible mechanisms were further discussed based on the hierarchical structure and p-n heterojunction.