Determination of effective oxygen adsorption species for CO sensing based on electric properties of indium oxide

Yongjiao Sun, Koichi Suematsu, Ken Watanabe, Maiko Nishibori, Jie Hu, Wendong Zhang, Kengo Shimanoe

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1 Citation (Scopus)

Abstract

To understand the relationship between adsorbed oxygen on the surface of indium oxide (In 2 O 3 ) and its CO-sensing property in wet and dry atmospheres, the oxygen adsorption properties and sensor response to CO were investigated. In 2 O 3 particles were prepared by a precipitation method and characterized using X-ray diffraction, scanning electron microscopy, and nitrogen absorption measurements. The O− and O 2− adsorption equilibrium constants, K 1 and K 2 , respectively, were calculated from the relationship between the electrical resistance and the oxygen partial pressure (P O2 ) using a competitive adsorption model. It was found that the values of both K 1 and K 2 decreased with increasing humidity, indicating a reduction in the amount of oxygen adsorption on the In 2 O 3 surface in a wet atmosphere. The In 2 O 3 particles can detect CO at ppm level in dry and wet atmospheres, although they were greatly reduced in wet atmospheres. Moreover, we found that the sensor response to CO is closely related to the values of K 1 and K 2 .

Original languageEnglish
Pages (from-to)B275-B280
JournalJournal of the Electrochemical Society
Volume165
Issue number7
DOIs
Publication statusPublished - Jan 1 2018

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Carbon Monoxide
Indium
Electric properties
Oxygen
Adsorption
Oxides
Acoustic impedance
Equilibrium constants
Sensors
Partial pressure
Atmospheric humidity
Nitrogen
X ray diffraction
Scanning electron microscopy
indium oxide

All Science Journal Classification (ASJC) codes

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

Cite this

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title = "Determination of effective oxygen adsorption species for CO sensing based on electric properties of indium oxide",
abstract = "To understand the relationship between adsorbed oxygen on the surface of indium oxide (In 2 O 3 ) and its CO-sensing property in wet and dry atmospheres, the oxygen adsorption properties and sensor response to CO were investigated. In 2 O 3 particles were prepared by a precipitation method and characterized using X-ray diffraction, scanning electron microscopy, and nitrogen absorption measurements. The O− and O 2− adsorption equilibrium constants, K 1 and K 2 , respectively, were calculated from the relationship between the electrical resistance and the oxygen partial pressure (P O2 ) using a competitive adsorption model. It was found that the values of both K 1 and K 2 decreased with increasing humidity, indicating a reduction in the amount of oxygen adsorption on the In 2 O 3 surface in a wet atmosphere. The In 2 O 3 particles can detect CO at ppm level in dry and wet atmospheres, although they were greatly reduced in wet atmospheres. Moreover, we found that the sensor response to CO is closely related to the values of K 1 and K 2 .",
author = "Yongjiao Sun and Koichi Suematsu and Ken Watanabe and Maiko Nishibori and Jie Hu and Wendong Zhang and Kengo Shimanoe",
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T1 - Determination of effective oxygen adsorption species for CO sensing based on electric properties of indium oxide

AU - Sun, Yongjiao

AU - Suematsu, Koichi

AU - Watanabe, Ken

AU - Nishibori, Maiko

AU - Hu, Jie

AU - Zhang, Wendong

AU - Shimanoe, Kengo

PY - 2018/1/1

Y1 - 2018/1/1

N2 - To understand the relationship between adsorbed oxygen on the surface of indium oxide (In 2 O 3 ) and its CO-sensing property in wet and dry atmospheres, the oxygen adsorption properties and sensor response to CO were investigated. In 2 O 3 particles were prepared by a precipitation method and characterized using X-ray diffraction, scanning electron microscopy, and nitrogen absorption measurements. The O− and O 2− adsorption equilibrium constants, K 1 and K 2 , respectively, were calculated from the relationship between the electrical resistance and the oxygen partial pressure (P O2 ) using a competitive adsorption model. It was found that the values of both K 1 and K 2 decreased with increasing humidity, indicating a reduction in the amount of oxygen adsorption on the In 2 O 3 surface in a wet atmosphere. The In 2 O 3 particles can detect CO at ppm level in dry and wet atmospheres, although they were greatly reduced in wet atmospheres. Moreover, we found that the sensor response to CO is closely related to the values of K 1 and K 2 .

AB - To understand the relationship between adsorbed oxygen on the surface of indium oxide (In 2 O 3 ) and its CO-sensing property in wet and dry atmospheres, the oxygen adsorption properties and sensor response to CO were investigated. In 2 O 3 particles were prepared by a precipitation method and characterized using X-ray diffraction, scanning electron microscopy, and nitrogen absorption measurements. The O− and O 2− adsorption equilibrium constants, K 1 and K 2 , respectively, were calculated from the relationship between the electrical resistance and the oxygen partial pressure (P O2 ) using a competitive adsorption model. It was found that the values of both K 1 and K 2 decreased with increasing humidity, indicating a reduction in the amount of oxygen adsorption on the In 2 O 3 surface in a wet atmosphere. The In 2 O 3 particles can detect CO at ppm level in dry and wet atmospheres, although they were greatly reduced in wet atmospheres. Moreover, we found that the sensor response to CO is closely related to the values of K 1 and K 2 .

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