A fast response & recovery H2S gas sensor based on α-Fe2O3 nanoparticles with ppb level detection limit
A fast response & recovery H2S gas sensor based on α-Fe2O3 nanoparticles with ppb level detection limit
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DOI：
10.1016/j.jhazmat.2015.07.003
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发表时间：
2015-12-30
影响因子：
13.6
通讯作者：
Fu, Yongqing
中科院分区：
文献类型：
--
作者：
Li, Zhijie;Huang, Yanwu;Fu, Yongqing
采用水热法制备了α-Fe 2 O3纳米颗粒前驱体，并对其进行热处理，制备了α-Fe 2 O3纳米颗粒H2S气敏元件。采用X射线衍射（XRD）、扫描电子显微镜（SEM）和透射电子显微镜（TEM）等表征手段对样品的化学成分和微观结构进行了表征。在100 ℃ ~ 400 ℃的不同工作温度下研究了传感器的气敏性能。结果表明，该传感器在300 ℃的工作温度下对H2S气体的检测具有最佳的灵敏度、重现性和长期稳定性。对H2S气体的检测限为0.05ppm，响应时间和恢复时间分别为30 s和5s。此外，还对传感器对H2S的敏感机理进行了探讨。(C)2015 Elsevier B. V.版权所有。
H2S gas sensor based on alpha-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 degrees C to 400 degrees 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 degrees C. The detection limit towards H2S gas was 0.05 ppm, and the response time and recovery time was 30s and 5 s, respectively. In addition, sensing mechanism of the sensor towards H2S was discussed. (C) 2015 Elsevier B.V. All rights reserved.