Gas sensing characteristics of WO3 nanoplates prepared by acidification method

Sun Jung Kim; In Sung Hwang; Joong Ki Choi; Jong Heun Lee

doi:10.1016/j.tsf.2010.10.026

Gas sensing characteristics of WO₃ nanoplates prepared by acidification method

Sun Jung Kim, In Sung Hwang, Joong Ki Choi, Jong Heun Lee

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

33 Citations (Scopus)

Abstract

WO₃·H₂O nanoplates were prepared by the acidification of Na₂WO₄· 2H₂O and converted into monoclinic WO₃ nanoplates by heat treatment. The sizes, morphologies and preferred orientation of the WO₃ nanoplates could be controlled by manipulating the acidity of the solution used for the acidification reaction. All of the WO₃ nanoplates showed the selective detection of NO₂ in the presence of other reducing gases, such as C₂H₅OH, CH₃COCH₃, CO, C ₃H₈, and H₂. The gas response, selectivity, and response speed were optimized by varying the morphology of the sensing materials and operation temperature. The WO₃ nanoplates with a mean edge size of 192 nm showed the most rapid gas response along with a high response and selectivity to NO₂ when operated at 300 °C.

Original language	English
Pages (from-to)	2020-2024
Number of pages	5
Journal	Thin Solid Films
Volume	519
Issue number	6
DOIs	https://doi.org/10.1016/j.tsf.2010.10.026
Publication status	Published - 2011 Jan 3

Keywords

Gas sensor
Nanostructures
Powders
Scanning electron microscopy
Selective detection
Tungsten oxide
X-ray diffraction

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Surfaces and Interfaces
Surfaces, Coatings and Films
Metals and Alloys
Materials Chemistry

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title = "Gas sensing characteristics of WO3 nanoplates prepared by acidification method",

abstract = "WO3·H2O nanoplates were prepared by the acidification of Na2WO4· 2H2O and converted into monoclinic WO3 nanoplates by heat treatment. The sizes, morphologies and preferred orientation of the WO3 nanoplates could be controlled by manipulating the acidity of the solution used for the acidification reaction. All of the WO3 nanoplates showed the selective detection of NO2 in the presence of other reducing gases, such as C2H5OH, CH3COCH3, CO, C 3H8, and H2. The gas response, selectivity, and response speed were optimized by varying the morphology of the sensing materials and operation temperature. The WO3 nanoplates with a mean edge size of 192 nm showed the most rapid gas response along with a high response and selectivity to NO2 when operated at 300 °C.",

keywords = "Gas sensor, Nanostructures, Powders, Scanning electron microscopy, Selective detection, Tungsten oxide, X-ray diffraction",

author = "Kim, {Sun Jung} and Hwang, {In Sung} and Choi, {Joong Ki} and Lee, {Jong Heun}",

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AU - Kim, Sun Jung

AU - Hwang, In Sung

AU - Choi, Joong Ki

AU - Lee, Jong Heun

PY - 2011/1/3

Y1 - 2011/1/3

N2 - WO3·H2O nanoplates were prepared by the acidification of Na2WO4· 2H2O and converted into monoclinic WO3 nanoplates by heat treatment. The sizes, morphologies and preferred orientation of the WO3 nanoplates could be controlled by manipulating the acidity of the solution used for the acidification reaction. All of the WO3 nanoplates showed the selective detection of NO2 in the presence of other reducing gases, such as C2H5OH, CH3COCH3, CO, C 3H8, and H2. The gas response, selectivity, and response speed were optimized by varying the morphology of the sensing materials and operation temperature. The WO3 nanoplates with a mean edge size of 192 nm showed the most rapid gas response along with a high response and selectivity to NO2 when operated at 300 °C.

AB - WO3·H2O nanoplates were prepared by the acidification of Na2WO4· 2H2O and converted into monoclinic WO3 nanoplates by heat treatment. The sizes, morphologies and preferred orientation of the WO3 nanoplates could be controlled by manipulating the acidity of the solution used for the acidification reaction. All of the WO3 nanoplates showed the selective detection of NO2 in the presence of other reducing gases, such as C2H5OH, CH3COCH3, CO, C 3H8, and H2. The gas response, selectivity, and response speed were optimized by varying the morphology of the sensing materials and operation temperature. The WO3 nanoplates with a mean edge size of 192 nm showed the most rapid gas response along with a high response and selectivity to NO2 when operated at 300 °C.

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KW - Nanostructures

KW - Powders

KW - Scanning electron microscopy

KW - Selective detection

KW - Tungsten oxide

KW - X-ray diffraction

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