A fast response & recovery H2S gas sensor based on α-Fe2O3 nanoparticles with ppb level detection limit
| Autor: | Weimei Chen, Wei Liu, Zhong Kuang, Dongyi Ao, Yong Qing Fu, Yanwu Huang, Zhijie Li, Shouchao Zhang |
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| Rok vydání: | 2015 |
| Předmět: |
Detection limit
Environmental Engineering Materials science F300 Scanning electron microscope Annealing (metallurgy) Health Toxicology and Mutagenesis F200 Analytical chemistry Nanoparticle Microstructure Pollution Hydrothermal circulation Operating temperature Transmission electron microscopy Environmental Chemistry Waste Management and Disposal |
| Zdroj: | Journal of Hazardous Materials. 300:167-174 |
| ISSN: | 0304-3894 |
| Popis: | H2S gas sensor based on α-Fe2O3 nanoparticles was fabricated by post-thermal annealing of Fe3O4 precursor which was synthesized using a facile hydrothermal route. The characteristic techniques including X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) were adopted to characterize the chemical composition and microstructure of the obtained samples. Gas-sensing performance of the sensor was investigated at different operation temperatures from 100 °C to 400 °C. Results showed that the sensor exhibited the best sensitivity, reproducibility and long-term stability for detecting H2S gas at an operating temperature of 300 °C. The detection limit towards H2S gas was 0.05 ppm, and the response time and recovery time was 30 s and 5 s, respectively. In addition, sensing mechanism of the sensor towards H2S was discussed. |
| Databáze: | OpenAIRE |
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