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- Title
Effect of Pt catalyst on the sensor performance of WO3 nanoflakes towards hazardous gases.
- Authors
Alev, Onur; Büyükköse, Serkan
- Abstract
Nobel metal functionalized chemiresistive type metal-oxide sensors were fabricated and tested against hazardous gases such as acetone, ethanol, hydrogen sulfide, hydrogen cyanide and dimethyl methylphosphonate. WO 3 nanoflakes (NFs) were fabricated on Al 2 O 3 substrates by a facile hydrothermal route. 2D nanoflakes randomly aligned and uniformly covered on the substrate surface, and the thickness of the NFs were found approximately 100 nm. Then, Pt was loaded on WO 3 nanoflakes by RF sputtering method. According to the sensor tests, Pt modification tremendously improved the sensor performance of nanoflakes against acetone gas in terms of sensor response, selectivity among the measured gases and operation temperature. The spillover effect of Pt increased the sensing response and the sensor was able to selectively detect acetone with 237 particle per billion (ppb) at operation temperature of 250 ∘ C. Pt functionalization suppresses the sensor responses of NFs against gases (ethanol, hydrogen sulfide, hydrogen cyanide and dimethyl methylphosphonate) other than acetone. While pristine NFs sensor was able to sense these gases at low temperatures, Pt-functionalized WO 3 NFs did not sense at temperatures lower than 200 ∘ C by giving rise to the selectivity of the sensor against acetone.
- Subjects
ACETONE; GAS detectors; DIMETHYL methylphosphonate; RADIOFREQUENCY sputtering; DETECTORS; HYDROCYANIC acid; DIMETHYL sulfoxide
- Publication
Journal of Materials Science: Materials in Electronics, 2021, Vol 32, Issue 20, p25376
- ISSN
0957-4522
- Publication type
Article
- DOI
10.1007/s10854-021-06997-x