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Synergistic Effects of PdOx-CuOx Loadings on Methyl Mercaptan Sensing of Porous WO3 Microspheres Prepared by Ultrasonic Spray Pyrolysis
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Document Title
Synergistic Effects of PdOx-CuOx Loadings on Methyl Mercaptan Sensing of Porous WO3 Microspheres Prepared by Ultrasonic Spray Pyrolysis
Author
Tammanoon N, Iwamoto T, Ueda T, Hyodo T, Wisitsoraat A, Liewhiran C, Shimizu Y
Name from Authors Collection
Affiliations
Chiang Mai University; Chiang Mai University; Nagasaki University; National Science & Technology Development Agency - Thailand; Chiang Mai University; Chiang Mai University
Type
Article
Source Title
ACS APPLIED MATERIALS & INTERFACES
ISSN
1944-8244
Year
2020
Volume
12
Issue
37
Page
41728-41739
Open Access
Green Accepted
Publisher
AMER CHEMICAL SOC
DOI
10.1021/acsami.0c10462
Format
Abstract
In this work, PdOx-CuOx co-loaded porous WO3 microspheres were synthesized with varying loading levels by ultrasonic spray pyrolysis (USP) using polymethyl methacrylate (PMMA) microspheres as a vehicle template. The as-prepared sensing materials and their fabricated sensor properties were characterized by X-ray analysis, nitrogen adsorption, and electron microscopy. The gas-sensing properties were studied toward methyl mercaptan (CH3SH), hydrogen sulfide (H2S), dimethyl sulfide (CH3SCH3), nitric oxide (NO), nitrogen dioxide (NO2), methane (CH4), ethanol (C2H5OH), and acetone (C3H6O) at 0.5 ppm under atmospheric conditions with different operating temperatures ranging from 100 to 400 degrees C. The results showed that the CH3SH response of USP-made WO3 microspheres was collaboratively enhanced by the creation of pores in the microsphere and co-loading of CuOx and PdOx at low operating temperatures (<= 200 degrees C). More importantly, the CH3SH selectivity against H2S was significantly improved and high selectivity against CH3SCH3, NO, NO2, CH4, C2H5OH, and CH3COCH3 were upheld by the incorporation of PdOx to CuOx-loaded WO3 sensors. Therefore, the co-loading of PdOx-CuOx on porous WO3 structures could be promising strategies to achieve highly selective and sensitive CH3SH sensors, which would be practically useful for specific applications including biomedical and periodontal diagnoses.
Keyword
Co-loading | Copper | methyl mercaptan sensor | palladium | ultrasonic spray pyrolysis | WO3
Funding Sponsor
Royal Golden Jubilee Ph.D. Programme (RGJ) [PHD/0152/2559]; National Research Council of Thailand (NRCT); Global Partnership, Office of National Higher Education Science Research and Innovation Policy Council (NXPO); Center of Excellence in Materials Science and Technology, Chiang Mai University; National Research University (NRU) Project under the Office of the Higher Education Commission (CHE), Ministry of Education, Thailand; Thailand Research Fund [RTA6180004]
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