Details

Autor(en) / Beteiligte

• Li, Zhijie
• Huang, Yanwu
• Zhang, Shouchao
• Chen, Weimei
• Kuang, Zhong
• Ao, Dongyi
• Liu, Wei
• Fu, Yongqing

Titel

A fast response & recovery H2S gas sensor based on α-Fe2O3 nanoparticles with ppb level detection limit

Ist Teil von

• Journal of hazardous materials, 2015-12, Vol.300, p.167-174

Ort / Verlag

Netherlands: Elsevier B.V

Erscheinungsjahr

2015

Link zum Volltext

Quelle

Elsevier ScienceDirect Journals Complete

Beschreibungen/Notizen

• •A H2S gas sensor based on α-Fe2O3 nanoparticles were prepared by hydrothermal route.•The detection limit of the sensor for H2S gas is as low as 0.05ppm at 300°C.•The response and recovery time of the sensors for detecting H2S less than 30s and 5s at 300°C.•The sensor possesses an excellent reproducibility and long-term stability in H2S detection. 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 0.05ppm, and the response time and recovery time was 30s and 5s, respectively. In addition, sensing mechanism of the sensor towards H2S was discussed.