期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 916, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2022.165431
关键词
Graphene; Nanocomposite; Hydrogen sulfide sensor; Graphene-metal oxide nanocomposites; Rh-doped SnO2
资金
- Department of Physics and Materials Science, Faculty of Science, Chiang Mai University [41/2021]
- Mid-Career Research Grant 2020 (National Research Council of Thailand (NRCT)) [NRCT5-RSA63004-04]
- National Science and Technology Development Agency (NSTDA)
- Center of Excellence (CoE) in Materials Science and Technology, Chiang Mai University
- Thailand Research Fund for TRF Research Team Promotion Grant [RTA6180004]
This study developed and investigated flame-made Rh-doped SnO2/electrochemically exfoliated graphene hybrid materials for gas sensing towards H2S. The results showed that Rh doping and graphene loading significantly enhanced the response and selectivity of the hybrid sensors, and optimizing the Rh doping amount and graphene content improved the H2S-sensing performance.
In this study, flame-made Rh-doped SnO2/electrochemically exfoliated graphene hybrid materials were developed and systematically investigated for gas sensing towards H2S. Structural characterizations by various microscopic and spectroscopic techniques demonstrated the dispersion of graphene sheets on Rhsubstituted polycrystalline SnO2 nanoparticles with improved specific surface area. The effects of Rh dopants and graphene on gas-sensing behaviors of the hybrid sensors were systematically evaluated towards H2S, H2, CH4, C2H2, C2H4, CH3SH, CO2, C2H5OH, C3H6O and NO2 at 200-400 degrees C in dry and humidified air with 20-80% RH. It was found that Rh doping at the optimal amount of 0.5 wt% considerably enhances the response and selectivity of flame-made SnO2 nanoparticles toward H2S and additional graphene loading further increases the H2S-sensing performance with the optimum graphene content of 0.5 wt%. Accordingly, the 0.5 wt% graphene-loaded 0.5 wt% Rh-doped SnO2 sensor provided the highest responses of similar to 439 and the shortest response time of 6.5 s to 10 ppm H2S with high selectivity against CH3SH, H2, CH4, C2H2, C2H4, CO2, C2H5OH, C3H6O and NO2 at the optimal working temperature of 350 degrees C. The mechanisms of H2S response enhancement were described by the combinative effects of catalytic p-type substitutional Rh dopants and active graphene-Rh-doped SnO2 junctions.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据