NO{sub 2} gas sensing of flame-made Pt-loaded WO{sub 3} thick films

Journal Article · Sun Jun 01 04:00:00 EDT 2014 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/J.JSSC.2013.10.041· OSTI ID:22334243

Samerjai, Thanittha ^[1]; Tamaekong, Nittaya ^[2]; Liewhiran, Chaikarn ^[3]; Wisitsoraat, Anurat ^[4]; Phanichphant, Sukon ^[5]

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1. Nanoscience and Nanotechnology Program, Faculty of Graduate School, Chiang Mai University, Chiang Mai 50200 (Thailand)
2. Program in Materials Science, Faculty of Science, Maejo University, Chiang Mai 50290 (Thailand)
3. Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai 50200 (Thailand)
4. Nanoelectronics and MEMS Laboratory, National Electronics and Computer Technology Center, Klong Luang, Pathumthani 12120 (Thailand)
5. Materials Science Research Center, Faculty of Science, Chiang Mai University, Chiang Mai 50200 (Thailand)

Unloaded WO{sub 3} and 0.25–1.0 wt% Pt-loaded WO{sub 3} nanoparticles for NO{sub 2} gas detection were synthesized by flame spray pyrolysis (FSP) and characterized via X-ray diffraction (XRD), scanning electron microscopy (SEM) and high resolution transmission electron microscopy (HRTEM). The BET surface area (SSA{sub BET}) of the nanoparticles was measured by nitrogen adsorption. The NO{sub 2} sensing properties of the sensors based on unloaded and Pt-loaded WO{sub 3} nanoparticles were investigated. The results showed that the gas sensing properties of the Pt-loaded WO{sub 3} sensors were excellent to those of the unloaded one. Especially, 0.25 wt% Pt-loaded WO{sub 3} sensor showed highest response to NO{sub 2} than the others at low operating temperature of 150 °C. - Graphical abstract: The response of 0.25 wt% Pt-loaded WO3 sensor was 637 towards NO{sub 2} concentration of 10 ppm at 150 °C. - Highlights: • Unloaded and Pt-loaded WO{sub 3} nanoparticles for NO{sub 2} gas detection were synthesized by flame spray pyrolysis (FSP). • Gas sensing properties of the Pt-loaded WO{sub 3} sensors were excellent to those of the unloaded one. • 0.25 wt% Pt-loaded WO{sub 3} sensor showed highest response to NO{sub 2} at low operating temperature of 150 °C.

• OSTI ID: 22334243
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Vol. 214; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
77 NANOSCIENCE AND NANOTECHNOLOGY
ADSORPTION
DETECTION
FILMS
NANOPARTICLES
NITROGEN DIOXIDE
PYROLYSIS
SCANNING ELECTRON MICROSCOPY
SENSORS
TRANSMISSION ELECTRON MICROSCOPY
TUNGSTATES
TUNGSTEN OXIDES
X-RAY DIFFRACTION