Zn<sub>2sub>SnO<sub>4sub>-doped SnO<sub>2sub> hollow spheres for phenylamine gas sensor application
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文摘
In this paper, Zn<sub>2sub>SnO<sub>4sub>-doped SnO<sub>2sub> hollow spheres (HSs) were successfully synthesized by a one-step facile hydrothermal strategy without using any surfactants. In order to investigate the morphology, crystalline property and chemical composition of the prepared Zn<sub>2sub>SnO<sub>4sub>-doped SnO<sub>2sub> HSs, a sequence of techniques inclusive of scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy were performed. The sensor based on the as-fabricated Zn<sub>2sub>SnO<sub>4sub>-doped SnO<sub>2sub> HSs exhibited an excellent gas-sensing performance to phenylamine, including good selectivity and good reproducibility as well as reinforced response compared with the pristine SnO<sub>2sub> sample. Such enhanced gas-sensing performances are probably ascribed to the unique porous HS morphology, the strong interfacial interaction between Zn<sub>2sub>SnO<sub>4sub> and SnO<sub>2sub> and the existence of heterojunctions. The as-fabricated Zn<sub>2sub>SnO<sub>4sub>-doped SnO<sub>2sub> HSs may also lead to potential applications in other fields such as lithium-ion batteries, catalysis and dye-sensitized solar cells.

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