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    MOF-SMO hybrids as a H2S sensor with superior sensitivity and selectivity

    Year: 2019

    Journal: Sens. Actuator B-Chem., Volume 292, AUG 1, page 32–39

    Authors: Wu, Xiaonan; Xiong, Shunshun; Gong, Yu; Gong, Youjin; Wu, Weiwei; Mao, Zhenghao; Liu, Qiang; Hu, Sheng; Long, Xinggui

    Organizations: Innovative Development Fund of CAEP [PY2019010, CX2019008]; National Magnetic Confinement Fusion Science Program [2015GB106004, 2014GB111000]; Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [21601170, 61604142]

    Keywords: Metal-organic frameworks; Integration; Gas sensor; Hydrogen sulfide; Sensitivity

    The detection of H2S is essential due to its dangerous toxicity and extensive existence in the oil and gas industries. Zeolitic imidazolate framework-8 (ZIF-8) particle-loaded ZnO nanorod hybrid is designed and fabricated as a gas sensor, which exhibits a superior sensitivity and selectivity for H2S at room temperature. ZIF-8 plays a key role in improving the sensitivity and selectivity of ZIF-8/ZnO nanorod sensor. The loading of porous ZIF-8 particles on the ZnO surfaces provides larger surface areas and more oxygen vacancies and reacts with H2S. Thus, ZIF-8/ZnO nanorod sensor has a better H2S adsorption function and transduction function compared to raw ZnO nanorod sensor. Remarkably, the response of ZIF-8/ZnO nanorod sensor to 10 ppm H2S is 52.1% even at 25 degrees C, which is 15 times higher than that of raw ZnO nanorod sensor. ZIF-8/ZnO nanorod sensor is able to detect H2S at a level down to 50 ppb. Moreover, it shows an excellent selective sensitivity for H2S over other reducing gases. High-performance H2S sensor is realized by the integration of metal-organic frameworks (MOFs) with semiconductor metal oxides (SMOs).
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