Grain-Size Effects in Tungsten Oxide-Based Sensor for Nitrogen Oxides

J. Tamaki; Z. Zhang; K. Fujimori; M. Akiyama; T. Harada; N. Miura; N. Yamazoe

doi:10.1149/1.2055088

Grain-Size Effects in Tungsten Oxide-Based Sensor for Nitrogen Oxides

J. Tamaki, Z. Zhang, K. Fujimori, M. Akiyama, T. Harada, N. Miura, N. Yamazoe

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

206 Citations (Scopus)

Abstract

The effects of the grain size of WO₃ on WO₃-based sensor for NO_x were investigated. By hydrolyzing ammonium paratungstate with hot nitric acid in solution and calcining the resulting precipitate in air at prescribed temperatures in the range of 300 to 600°C, the mean crystallite sizes (D) of WO₃ were varied in the range of 16 to 57 nm. The sensitivities of the WO₃ sensor elements to NO₂ (10 ppm) as well as to NO (200 ppm) remained independent of D down to D = 33 nm, below which the sensitivities increased steeply with a decrease in D, reaching at D = 25 nm the sensitivity values three to four times as large as those for D > 33 nm.

Original language	English
Pages (from-to)	2207-2210
Number of pages	4
Journal	Journal of the Electrochemical Society
Volume	141
Issue number	8
DOIs	https://doi.org/10.1149/1.2055088
Publication status	Published - Aug 1994
Externally published	Yes

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Renewable Energy, Sustainability and the Environment
Surfaces, Coatings and Films
Electrochemistry
Materials Chemistry

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This output contributes to the following UN Sustainable Development Goals (SDGs)

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title = "Grain-Size Effects in Tungsten Oxide-Based Sensor for Nitrogen Oxides",

abstract = "The effects of the grain size of WO3 on WO3-based sensor for NOx were investigated. By hydrolyzing ammonium paratungstate with hot nitric acid in solution and calcining the resulting precipitate in air at prescribed temperatures in the range of 300 to 600°C, the mean crystallite sizes (D) of WO3 were varied in the range of 16 to 57 nm. The sensitivities of the WO3 sensor elements to NO2 (10 ppm) as well as to NO (200 ppm) remained independent of D down to D = 33 nm, below which the sensitivities increased steeply with a decrease in D, reaching at D = 25 nm the sensitivity values three to four times as large as those for D > 33 nm.",

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T1 - Grain-Size Effects in Tungsten Oxide-Based Sensor for Nitrogen Oxides

AU - Tamaki, J.

AU - Zhang, Z.

AU - Fujimori, K.

AU - Akiyama, M.

AU - Harada, T.

AU - Miura, N.

AU - Yamazoe, N.

PY - 1994/8

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N2 - The effects of the grain size of WO3 on WO3-based sensor for NOx were investigated. By hydrolyzing ammonium paratungstate with hot nitric acid in solution and calcining the resulting precipitate in air at prescribed temperatures in the range of 300 to 600°C, the mean crystallite sizes (D) of WO3 were varied in the range of 16 to 57 nm. The sensitivities of the WO3 sensor elements to NO2 (10 ppm) as well as to NO (200 ppm) remained independent of D down to D = 33 nm, below which the sensitivities increased steeply with a decrease in D, reaching at D = 25 nm the sensitivity values three to four times as large as those for D > 33 nm.

AB - The effects of the grain size of WO3 on WO3-based sensor for NOx were investigated. By hydrolyzing ammonium paratungstate with hot nitric acid in solution and calcining the resulting precipitate in air at prescribed temperatures in the range of 300 to 600°C, the mean crystallite sizes (D) of WO3 were varied in the range of 16 to 57 nm. The sensitivities of the WO3 sensor elements to NO2 (10 ppm) as well as to NO (200 ppm) remained independent of D down to D = 33 nm, below which the sensitivities increased steeply with a decrease in D, reaching at D = 25 nm the sensitivity values three to four times as large as those for D > 33 nm.

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Grain-Size Effects in Tungsten Oxide-Based Sensor for Nitrogen Oxides

Abstract

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