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- W3138409822 abstract "Gas-sensing materials that can detect ultra-low gas concentration at ppb level have attracted widespread attention. In order to reduce minimum detectable limit, on the one hand, we synthesized 3D SnO2-ZnO aerogels by two-step reactions and annealing process. On the other hand, we utilized UV light to motivate lower response concentration. SnO2-ZnO aerogels exhibit ultra-low response concentration as 10 ppb to ethanol at 300℃ under UV irradiation. In this condition, their response time (∼2 s), recovery time (∼37 s) and stability (within 14 days) also represent that SnO2-ZnO aerogels are suitable for gas sensors. Lastly, ethanol-sensing mechanism indicates that the following aspects help SnO2-ZnO aerogels to detect ultra-low ethanol concentration under UV irradiation: (i) adequate mesoporous structure increases active sites, facilitates ethanol transfer and improves UV utilization; (ii) tensile strain enables aerogels to absorb more abundant UV energy and then produce available photo-electrons in ethanol atmosphere; (iii) well-planned bandgap structure (SnO2 grain, ZnO grain and n-n heterojunction) can also provide more photo-electrons to reduce resistance in ethanol atmosphere." @default.
- W3138409822 created "2021-03-29" @default.
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- W3138409822 date "2021-06-01" @default.
- W3138409822 modified "2023-10-02" @default.
- W3138409822 title "UV excited gas sensing SnO2-ZnO aerogels to ppb-level ethanol detection" @default.
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- W3138409822 doi "https://doi.org/10.1016/j.snb.2021.129815" @default.
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