Ultrasensitive ppb-level H2S gas sensor at room temperature based on WO3/rGO hybrids
| Autor: | Tiantian Huang, Fang Peng, Shaojie Wang, Jiaming Hao, Ning Dai, Weiwei Yu, Xin Chen, Yan Sun, Chuanwei Cheng |
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| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
Materials science Fabrication Graphene Hydrogen sulfide Oxide Heterojunction Condensed Matter Physics 01 natural sciences Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials law.invention Hydrogen sulfide sensor chemistry.chemical_compound Chemical engineering chemistry law Specific surface area 0103 physical sciences Electrical and Electronic Engineering Selectivity |
| Zdroj: | Journal of Materials Science: Materials in Electronics. 31:5008-5016 |
| ISSN: | 1573-482X 0957-4522 |
| Popis: | Gas sensors with high performance and low energy consumption are necessary for system integration in the environment monitoring of explosives. High-performance room-temperature hydrogen sulfide (H2S) gas sensors were fabricated based on the hybrids of tungsten oxide (WO3)/reduced graphene oxide (rGO). WO3 nanocubes modified with different contents of rGO were synthesized by acid-based hydrothermal method. The optimal amount of rGO in the composite is 5 wt%, at which the room-temperature operating sensor presents the highest sensitivity of approximately 32.7 to 500 ppb H2S, a fast recovery time of ~ 180 s, as well as an excellent sensing selectivity. The overall improvement in sensing performances demonstrated an important progress made in H2S sensor fabrication for portable and real-time gas detection. The improved gas-sensing performance is attributed to the large specific surface area of the WO3 nanocubes, the formation of WO3/rGO heterojunctions, and the enhanced electron transfer efficiency. |
| Databáze: | OpenAIRE |
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