Effect of surface modification on NO2 sensing properties of SnO2 varistor-type sensors

Yasuhiro Shimizu; Elisabetta Di Bartolomeo; Enrico Traversa; Gualtiero Gusmano; Takeo Hyodo; Kenji Wada; Makoto Egashira

doi:10.1016/S0925-4005(99)00250-6

Effect of surface modification on NO₂ sensing properties of SnO₂ varistor-type sensors

Yasuhiro Shimizu, Elisabetta Di Bartolomeo, Enrico Traversa, Gualtiero Gusmano, Takeo Hyodo, Kenji Wada, Makoto Egashira

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

30 Scopus citations

Abstract

NO₂ sensing properties of SnO₂-based varistor-type sensors have been investigated in the temperature range of 400-650 °C and in the NO₂ concentration range of 15-30 ppm. Pure SnO₂ exhibited a weak nonlinear I-V characteristic in air, but clear nonlinearity in NO₂ at 450 °C. The breakdown voltage of SnO₂ shifted to a high electric field upon exposure to NO₂ and the magnitude of the shift was well correlated with NO₂ concentration. Thus, SnO₂ exhibited some sensitivity to NO₂ as a varistor-type sensor. When SnO₂ particles coated with a SiO₂ thin film were used as a raw material for fabricating a varistor, the breakdown voltage in air was approximately the double that of pure SnO₂ and the sensitivity to 15 ppm NO₂ was enhanced slightly. However, the sensitivity to 30 ppm NO₂ decreased. The Cr₂O₃-loading on SnO₂ also led to an increase in the breakdown voltage in air, but the Cr₂O₃ addition was not effective for promoting the NO₂ sensitivity under the present experimental conditions.

Original language	English (US)
Pages (from-to)	118-124
Number of pages	7
Journal	Sensors and Actuators, B: Chemical
Volume	60
Issue number	2
DOIs	https://doi.org/10.1016/S0925-4005(99)00250-6
State	Published - Nov 23 1999
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Metals and Alloys
Instrumentation
Materials Chemistry
Surfaces, Coatings and Films
Electrical and Electronic Engineering

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10.1016/S0925-4005(99)00250-6

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title = "Effect of surface modification on NO2 sensing properties of SnO2 varistor-type sensors",

abstract = "NO2 sensing properties of SnO2-based varistor-type sensors have been investigated in the temperature range of 400-650 °C and in the NO2 concentration range of 15-30 ppm. Pure SnO2 exhibited a weak nonlinear I-V characteristic in air, but clear nonlinearity in NO2 at 450 °C. The breakdown voltage of SnO2 shifted to a high electric field upon exposure to NO2 and the magnitude of the shift was well correlated with NO2 concentration. Thus, SnO2 exhibited some sensitivity to NO2 as a varistor-type sensor. When SnO2 particles coated with a SiO2 thin film were used as a raw material for fabricating a varistor, the breakdown voltage in air was approximately the double that of pure SnO2 and the sensitivity to 15 ppm NO2 was enhanced slightly. However, the sensitivity to 30 ppm NO2 decreased. The Cr2O3-loading on SnO2 also led to an increase in the breakdown voltage in air, but the Cr2O3 addition was not effective for promoting the NO2 sensitivity under the present experimental conditions.",

author = "Yasuhiro Shimizu and {Di Bartolomeo}, Elisabetta and Enrico Traversa and Gualtiero Gusmano and Takeo Hyodo and Kenji Wada and Makoto Egashira",

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T1 - Effect of surface modification on NO2 sensing properties of SnO2 varistor-type sensors

AU - Shimizu, Yasuhiro

AU - Di Bartolomeo, Elisabetta

AU - Traversa, Enrico

AU - Gusmano, Gualtiero

AU - Hyodo, Takeo

AU - Wada, Kenji

AU - Egashira, Makoto

PY - 1999/11/23

Y1 - 1999/11/23

N2 - NO2 sensing properties of SnO2-based varistor-type sensors have been investigated in the temperature range of 400-650 °C and in the NO2 concentration range of 15-30 ppm. Pure SnO2 exhibited a weak nonlinear I-V characteristic in air, but clear nonlinearity in NO2 at 450 °C. The breakdown voltage of SnO2 shifted to a high electric field upon exposure to NO2 and the magnitude of the shift was well correlated with NO2 concentration. Thus, SnO2 exhibited some sensitivity to NO2 as a varistor-type sensor. When SnO2 particles coated with a SiO2 thin film were used as a raw material for fabricating a varistor, the breakdown voltage in air was approximately the double that of pure SnO2 and the sensitivity to 15 ppm NO2 was enhanced slightly. However, the sensitivity to 30 ppm NO2 decreased. The Cr2O3-loading on SnO2 also led to an increase in the breakdown voltage in air, but the Cr2O3 addition was not effective for promoting the NO2 sensitivity under the present experimental conditions.

AB - NO2 sensing properties of SnO2-based varistor-type sensors have been investigated in the temperature range of 400-650 °C and in the NO2 concentration range of 15-30 ppm. Pure SnO2 exhibited a weak nonlinear I-V characteristic in air, but clear nonlinearity in NO2 at 450 °C. The breakdown voltage of SnO2 shifted to a high electric field upon exposure to NO2 and the magnitude of the shift was well correlated with NO2 concentration. Thus, SnO2 exhibited some sensitivity to NO2 as a varistor-type sensor. When SnO2 particles coated with a SiO2 thin film were used as a raw material for fabricating a varistor, the breakdown voltage in air was approximately the double that of pure SnO2 and the sensitivity to 15 ppm NO2 was enhanced slightly. However, the sensitivity to 30 ppm NO2 decreased. The Cr2O3-loading on SnO2 also led to an increase in the breakdown voltage in air, but the Cr2O3 addition was not effective for promoting the NO2 sensitivity under the present experimental conditions.

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JO - Sensors and Actuators, B: Chemical

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ER -

Effect of surface modification on NO₂ sensing properties of SnO₂ varistor-type sensors

Abstract

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