Journal
APPLIED SURFACE SCIENCE
Volume 496, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2019.143613
Keywords
Flame spray pyrolysis; Bi2WO6 nanoparticles; Reduced graphene oxide; H2S sensor
Categories
Funding
- Thailand Graduate Institute of Science and Technology (TGIST) [SCA-CO-2560-4574-TH, TG-44-10-60-066M]
- National Science and Technology Development Agency (NSTDA)
- CMU Mid-Career Research Fellowship Program
- Thailand Research Fund [TRF: RSA6080014, RTA6180004]
- Center of Excellence in Materials Science and Technology, Chiang Mai University under administration of Materials Science Research Center, Faculty of Science, Chiang Mai University
- Center of Excellence in Materials Science and Technology, Chiang Mai University under National Research University (NRU) Project under the Office of the Higher Education Commission (CHE), Ministry of Education, Thailand
- Center of Excellence in Materials Science and Technology, Chiang Mai University under Materials Science Research Center, Chiang Mai University
- Center of Excellence in Materials Science and Technology, Chiang Mai University under Graduate School, Chiang Mai University
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In this study, the effects of reduced graphene oxide (rGO) loading on the gas-sensing characteristics of flame-made Bi2WO6 nanoparticles were systematically investigated. Bi2WO6 nanoparticles produced by flame spray pyrolysis (FSP) were loaded with rGO prepared based on Hummer's method with varying concentrations from 0 to 5 wt%. Characterized results by X-Ray diffraction, scanning and transmission electron microscopy, energy dispersive spectroscopy, Raman spectroscopy, X-ray photoemission spectroscopy and nitrogen adsorption confirmed the dispersion of rGO sheets within 5-15 nm FSP-made orthorhombic Bi2WO6 nanoparticles. The gas-sensing data measured in dry air demonstrated that the optimal rGO loading level of 2 wt% provided substantial enhancements of H2S response and selectivity. Specifically, the 2 wt% rGO-loaded Bi2WO6 sensor exhibited the highest response of similar to 29 towards 10 ppm H2S with high selectivity against H-2, CH4, NO, NO2, C7H8, CH2O, C8H10, C6H6, C3H6O, CH3OH, C2H5OH, C3H6O2, C3H6O3, C4H8O2, CH3COOH, C4H9COOH and HCOOH at an optimal working temperature of 350 degrees C. The roles of rGO on gas-sensing behaviors were explained on the basis of p-n heterojunctions between rGO and Bi2WO6. Therefore, the rGO-loaded Bi2WO6 sensor is an attractive candidate for H2S detection.
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