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通过简单的水热法合成了由纳米颗粒自组装而成的分等级中空微球结构WO3和Co_3O4/WO3材料，整个实验过程中不添加任何的表面活性剂和模板剂，符合绿色化学发展理念。对样品的形貌、结构、化学成分和气敏性能进行了表征。结果表明，Co_3O4/WO3复合材料成功构筑p-n异质结并呈中空微球结构。在气敏性能测试中，Co_3O4/WO3复合材料传感器在最佳工作温度50℃下对体积分数为1×10-5的H_2S气体的响应值为42.1,约为WO3传感器的3.37倍，响应时间仅为8 s。本实验还进行了1×10-8～5×10-5不同体积分数的H_2S气体连续循环检测，检测下限低至1×10-8。同时，所制备的传感器具有良好的稳定性、选择性和重现性。此外，还详细分析了Co_3O4/WO3复合材料用于H_2S气体检测的传感机理。
Abstract：Hierarchical hollow microsphere structure WO3 and Co_3O4/WO3 materials were synthesized by a simple hydrothermal method with self-assembly of nanoparticles, and no surfactants or templating agents were added throughout the experimental process, which is in line with the green chemistry development concept. The morphology, structure, chemical composition and gas sensitive properties of the samples were characterized. The results show that the Co_3O4/WO3 composites are successfully constructed as p-n heterojunctions and have hollow microsphere structure. In the gas sensitive performance test, the Co_3O4/WO3 composite sensor shows a response value of 42.1 to H_2S gas with a volume fraction of 1×10-5 at the optimum operating temperature of 50 ℃, which is about 3.37 times that of WO3 sensor, with a response time of only 8 s. The continuous cyclic detection of H_2S gas with different volume fractions of 1×10-8～5×10-5 was carried out in the experiment. And the detection limit is as low as 1×10-8.Meanwhile, the prepared sensor has good stability, selectivity and reproducibility. In addition, the sensing mechanism of Co_3O4/WO3 composites for H_2S gas detection was analyzed in detail.
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基本信息:
DOI：10.13250/j.cnki.wndz.2023.12.008
中图分类号:TB33
引用信息:
[1]沈继军,刘建军,王阳,等.基于分等级中空微球结构Co_3O_4/WO_3复合材料的制备及对H_2S的气敏性能[J].微纳电子技术,2023,60(12):1963-1972.DOI:10.13250/j.cnki.wndz.2023.12.008.
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2023-12-11