Journal
ARABIAN JOURNAL OF CHEMISTRY
Volume 13, Issue 1, Pages 3043-3059Publisher
ELSEVIER
DOI: 10.1016/j.arabjc.2018.08.013
Keywords
Fe doping; SnO2; Flame spray pyrolysis; Metal oxide; Acetylene; Gas sensor
Categories
Funding
- CMU 50th Anniversary Ph.D. Grant from Chiang Mai University [PHD/019/2556]
- Graduate School, Department of Physics and Materials Science, Faculty of Science, Chiang Mai University
- National Science and Technology Development Agency (NSTDA)
- National Research Council of Thailand (NRCT)
- Thailand Research Fund [TRF: RSA6080014, RTA6180004]
- National Research University (NRU) Project under the Office of the Higher Education Commission (CHE), Ministry of Education, Thailand
- Center of Excellence (CoE) in Materials Science and Technology, Chiang Mai University
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In this work, flame-spray-made Fe-doped SnO2 nanoparticles were comprehensively investigated for acetylene (C2H2) detection and the roles of Fe dopants on sensing mechanisms were explored. The sensing material properties were evaluated by X-ray diffraction, electron microscopy, N-2 adsorption-desorption analysis, X-ray absorption/photoemission spectroscopy and UV-visible spectroscopy. The structural characterizations confirmed that the nanoparticles had a tetragonal nanocrystalline SnO2 phase and Fe3+ dopant species formed a solid solution with SnO2 lattice. The sensors were measured towards 0.15-3 vol% C2H2 in dry air at various working temperatures (200-350 degrees C). Gas-sensing data demonstrated that the optimal Fe doping level of 0.1 wt% led to a substantially enhanced response of 748.7 toward 3 vol% C2H2 with a decent response time of 2.5 s at the optimal working temperature of 300 degrees C. Furthermore, the optimal SnO2 sensor demonstrated high C2H2 selectivity against C2H5OH, NO2, H-2, NH3, CO2, NO, H2S, CH4, C2H4O, C2H4 and N2O. Additional detailed analyses suggested that Fe3+ species played catalytic roles for enhancing C2H2 dissociation and oxidation. Thus, the Fe-doped SnO2 sensors were highly promising for selective and sensitive detections of acetylene in industrial applications. (C) 2018 Production and hosting by Elsevier B.V. on behalf of King Saud University.
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