Gas sensing characteristics of WO3-doped SnO2 thin films prepared by solution deposition method

Joong Ki Choi; Pyeong Seok Cho; Jong Heun Lee

doi:10.3740/MRSK.2008.18.4.193

Gas sensing characteristics of WO₃-doped SnO₂ thin films prepared by solution deposition method

Joong Ki Choi, Pyeong Seok Cho, Jong Heun Lee

Research output: Contribution to journal › Article › peer-review

2 Citations (Scopus)

Abstract

WO₃-doped SnO₂ thin films were prepared in a solution-deposition method and their gas-sensing characteristics were investigated. The doping of WO₈ to SnO₂ increased the response (R_a/R_g, R_a: resistance in air, R_g: resistance in gas) to H₂ substantially. Moreover, the R_a/R_g value of 10 ppm CO increased to 5.65, whereas that of NO₂ did not change by a significant amount. The enhanced response to H₂ and the selective detection of CO in the presence of NO₂ were explained in relation to the change in the surface reaction by the addition of WO₃. The WO₃-doped SnO₂ sensor can be used with the application of a H₂ sensor for vehicles that utilize fuel cells and as an air quality sensor to detect CO-containing exhaust gases emitted from gasoline engines.

Original language	English
Pages (from-to)	193-198
Number of pages	6
Journal	Korean Journal of Materials Research
Volume	18
Issue number	4
DOIs	https://doi.org/10.3740/MRSK.2008.18.4.193
Publication status	Published - 2008 Apr
Externally published	Yes

Keywords

Gas sensor
SnO
Solution deposition method
WO

ASJC Scopus subject areas

Materials Science(all)

Access to Document

10.3740/MRSK.2008.18.4.193

Cite this

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title = "Gas sensing characteristics of WO3-doped SnO2 thin films prepared by solution deposition method",

abstract = "WO3-doped SnO2 thin films were prepared in a solution-deposition method and their gas-sensing characteristics were investigated. The doping of WO8 to SnO2 increased the response (Ra/Rg, Ra: resistance in air, Rg: resistance in gas) to H2 substantially. Moreover, the Ra/Rg value of 10 ppm CO increased to 5.65, whereas that of NO2 did not change by a significant amount. The enhanced response to H2 and the selective detection of CO in the presence of NO2 were explained in relation to the change in the surface reaction by the addition of WO3. The WO3-doped SnO2 sensor can be used with the application of a H2 sensor for vehicles that utilize fuel cells and as an air quality sensor to detect CO-containing exhaust gases emitted from gasoline engines.",

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AB - WO3-doped SnO2 thin films were prepared in a solution-deposition method and their gas-sensing characteristics were investigated. The doping of WO8 to SnO2 increased the response (Ra/Rg, Ra: resistance in air, Rg: resistance in gas) to H2 substantially. Moreover, the Ra/Rg value of 10 ppm CO increased to 5.65, whereas that of NO2 did not change by a significant amount. The enhanced response to H2 and the selective detection of CO in the presence of NO2 were explained in relation to the change in the surface reaction by the addition of WO3. The WO3-doped SnO2 sensor can be used with the application of a H2 sensor for vehicles that utilize fuel cells and as an air quality sensor to detect CO-containing exhaust gases emitted from gasoline engines.

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