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首页> 外文期刊>Physical chemistry chemical physics: PCCP >High-performance formaldehyde gas-sensors based on three dimensional center-hollow ZnO
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High-performance formaldehyde gas-sensors based on three dimensional center-hollow ZnO

机译：基于三维中心空心ZnO的高性能甲醛气体传感器

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摘要

Three dimensional (3D) center-hollow ZnO architectures assembled by nanoparticles have been successfully fabricated on a large scale via a template-free method using an oil bath. The samples were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, Brunauer-Emmett-Teller specific surface area, surface photocurrent and UV-Vis diffuse reflectance spectroscopy. The photoelectric gas-sensing results demonstrated that the 3D porous, center-hollow ZnO structures exhibited excellent sensitivity and good selectivity to formaldehyde under 365 nm light irradiation at room temperature. The gas response to 1 ppm formaldehyde can reach 70%, which is superior to the results reported in the literature, indicating that the 3D center-hollow ZnO architectures are ideal candidate materials for photoelectric gas sensors. The underlying mechanisms responsible for the high sensitivity and selectivity to formaldehyde are discussed, which provide a new pathway for designing novel VOC sensors. Moreover, the facile method presented in this paper has the advantage of low-cost and high-yield, which is suitable for the practical production processes.
机译：由纳米颗粒组装而成的三维（3D）中心空心ZnO结构已成功通过无模板方法使用油浴大规模地制造。通过X射线衍射，扫描电子显微镜，透射电子显微镜，Brunauer-Emmett-Teller比表面积，表面光电流和UV-Vis漫反射光谱对样品进行表征。光电气敏结果表明，在室温下365 nm光照射下，3D多孔，中心空心ZnO结构表现出出色的灵敏度和对甲醛的良好选择性。气体对1 ppm甲醛的响应可以达到70％，优于文献报道的结果，这表明3D中心空心ZnO体系结构是光电气体传感器的理想候选材料。讨论了对甲醛的高敏感性和选择性的潜在机理，这为设计新型VOC传感器提供了一条新途径。此外，本文提出的简便方法具有低成本和高产率的优点，适合于实际生产过程。

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