期刊
ADVANCED MATERIALS
卷 34, 期 2, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202104958
关键词
2D materials; gas sensing; NbWO; (6) nanosheets; perovskites; semiconductors
类别
资金
- National Key Research and Development Program of China [2018YFA0209401, 2018YFA0703700, 2017YFA0204600]
- National Natural Science Foundation of China [1201101405, 22005058, 21875044, 51872050]
- China Postdoctoral Science Foundation [2020M670973, BX20200085]
- Science and Technology Commission of Shanghai Municipality [19520744300, 18520744600]
- Key Basic Research Program of Science and Technology Commission of Shanghai Municipality [20JC1415300]
- state key laboratory of Transducer Technology of China [SKT1904]
In this study, 2D all-inorganic NbWO6 perovskite nanosheets with thicknesses down to 1.5 nm were synthesized by liquid exfoliation, showing high selectivity, sensitivity, and fast response in hydrogen sulfide detection. This work highlights the potential of low-dimensional, nontoxic, and wide-bandgap perovskite semiconductors for high-performance gas sensors working in ambient conditions.
Hydrogen sulfide (H2S) detection with high selectivity and low working temperature is of great significance due to its strong toxicity both to the environment and to humans and also as an endogenous signaling molecule existing in various physiological processes. 2D perovskites with high carrier mobility are promising candidates for gas sensing; however, the development of stable and nontoxic 2D perovskites nanosheets still remains a challenge. Herein, 2D all-inorganic NbWO6 perovskite nanosheets with thicknesses down to 1.5 nm are synthesized by liquid exfoliation, and the gas-sensing performance based on these ultrathin nanosheets is investigated. A few-layer NbWO6-based sensor exhibits fast H2S sensing speed (<6 s) with high selectivity and sensitivity (S = 12.5 vs 50 ppm) at low temperature (150 degrees C). A small variation of H2S concentration (<0.5 ppm) can be detected with a fully reversible resistance signal. This work sheds light on the development of high-performance gas sensors working in ambient conditions based on low-dimensional, nontoxic, and wide-bandgap perovskite semiconductors. The high carrier mobility, ultrathin structure, and soft nature make this type of 2D perovskite semiconductor an ideal material candidate for the fabrication of flexible, transparent, and wearable sensing devices in the future.
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