通过水热法结合原位生长法,制备了CdS纳米颗粒修饰的ZnO纳米棒(CdS/ZnO)异质复合材料。通过扫描电子显微镜、透射电子显微镜和X射线光电子能谱仪对CdS/ZnO复合材料的形貌、尺寸、元素组成以及表面化学吸附氧含量进行了分析表征。气敏测试结果表明在460nm LED灯珠激发下,CdS/ZnO异质复合材料对浓度5ppm的NO2响应度可达28,检测下限低至100ppb,同时具备良好的稳定性、选择性和抗湿性。CdS/ZnO异质复合材料优异的气敏性能得益于CdS的可见光吸收能力以及CdS与ZnO之间的异质界面作用。
The heterogeneous ZnO nanorods modified with CdS nanoparticles (CdS/ZnO) were prepared by hydrothermal method combined with in-situ growth method.The morphology,size,elemental composition and surface chemisorbed oxygen content of the CdS/ZnO composites were characterized by scanning electron microscopy,transmission electron microscopy and X-ray photoelectron spectroscopy.The gas-sensitive test results showed that under the excitation of 460nm LED lamp beads,the response of CdS/ZnO heterogeneous composites to NO2 concentration of 5ppm at room temperature reached 28,and the detection limit was as low as 100ppb,with good stability,selectivity and moisture resistance.The excellent gas sensitivity of CdS/ZnO heterogeneous composites was attributed to the visible light absorption capacity of CdS and the heterogeneous interaction between CdS and ZnO.
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