Highly sensitive xylene sensors using Fe2O3-ZnFe2O4composite spheres

Jin Fang Chan; Jae Kyoung Jeon; Young Kook Moon; Jong Heun Lee

doi:10.46670/JSST.2021.30.4.191

Highly sensitive xylene sensors using Fe₂O₃-ZnFe₂O₄composite spheres

Jin Fang Chan, Jae Kyoung Jeon, Young Kook Moon, Jong Heun Lee

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

4 Citations (Scopus)

Abstract

Pure ZnFe₂O₄and Fe₂O₃-ZnFe₂O₄hetero-composite spheres were prepared by ultrasonic spray pyrolysis of a solution containing Znand Fe-nitrates. Additionally, the sensing characteristics of these spheres in the presence of 5 ppm ethanol, benzene, p-xylene, toluene, and CO (within the temperature range of 275-350^oC) were investigated. The Fe₂O₃-ZnFe₂O₄hetero-composite sensor with a cation ratio of [Zn]: [Fe] = 1:3 exhibited a high response (resistance ratio = 140.2) and selectivity (response to p-xylene/response to ethanol = 3.4) to 5 ppm p-xylene at 300^oC, whereas the pure ZnFe₂O₄sensor showed a comparatively lower gas response and selectivity. The reasons for the superior response and selectivity to p-xylene in Fe₂O₃-ZnFe₂O₄hetero-composite sensor were discussed in relation to the electronic sensitization due to charge transfer at Fe₂O₃-ZnFe₂O₄interface and Fe₂O₃-induced catalytic promotion of gas sensing reaction. The sensor can be used to monitor harmful volatile organic compounds and indoor air pollutants.

Original language	English
Pages (from-to)	191-195
Number of pages	5
Journal	Journal of Sensor Science and Technology
Volume	30
Issue number	4
DOIs	https://doi.org/10.46670/JSST.2021.30.4.191
Publication status	Published - 2021 Jul

Bibliographical note

Publisher Copyright:
© 2021 The Authors.

Keywords

FeO-ZnFeO
Gas sensors
Oxide semiconductors
Ultrasonic spray pyrolysis
Xylene

ASJC Scopus subject areas

Chemical Engineering (miscellaneous)
Engineering (miscellaneous)
Materials Science (miscellaneous)

Access to Document

10.46670/JSST.2021.30.4.191

Cite this

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title = "Highly sensitive xylene sensors using Fe2O3-ZnFe2O4composite spheres",

abstract = "Pure ZnFe2O4and Fe2O3-ZnFe2O4hetero-composite spheres were prepared by ultrasonic spray pyrolysis of a solution containing Znand Fe-nitrates. Additionally, the sensing characteristics of these spheres in the presence of 5 ppm ethanol, benzene, p-xylene, toluene, and CO (within the temperature range of 275-350oC) were investigated. The Fe2O3-ZnFe2O4hetero-composite sensor with a cation ratio of [Zn]: [Fe] = 1:3 exhibited a high response (resistance ratio = 140.2) and selectivity (response to p-xylene/response to ethanol = 3.4) to 5 ppm p-xylene at 300oC, whereas the pure ZnFe2O4sensor showed a comparatively lower gas response and selectivity. The reasons for the superior response and selectivity to p-xylene in Fe2O3-ZnFe2O4hetero-composite sensor were discussed in relation to the electronic sensitization due to charge transfer at Fe2O3-ZnFe2O4interface and Fe2O3-induced catalytic promotion of gas sensing reaction. The sensor can be used to monitor harmful volatile organic compounds and indoor air pollutants.",

keywords = "FeO-ZnFeO, Gas sensors, Oxide semiconductors, Ultrasonic spray pyrolysis, Xylene",

author = "Chan, {Jin Fang} and Jeon, {Jae Kyoung} and Moon, {Young Kook} and Lee, {Jong Heun}",

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year = "2021",

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AU - Jeon, Jae Kyoung

AU - Moon, Young Kook

AU - Lee, Jong Heun

PY - 2021/7

Y1 - 2021/7

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AB - Pure ZnFe2O4and Fe2O3-ZnFe2O4hetero-composite spheres were prepared by ultrasonic spray pyrolysis of a solution containing Znand Fe-nitrates. Additionally, the sensing characteristics of these spheres in the presence of 5 ppm ethanol, benzene, p-xylene, toluene, and CO (within the temperature range of 275-350oC) were investigated. The Fe2O3-ZnFe2O4hetero-composite sensor with a cation ratio of [Zn]: [Fe] = 1:3 exhibited a high response (resistance ratio = 140.2) and selectivity (response to p-xylene/response to ethanol = 3.4) to 5 ppm p-xylene at 300oC, whereas the pure ZnFe2O4sensor showed a comparatively lower gas response and selectivity. The reasons for the superior response and selectivity to p-xylene in Fe2O3-ZnFe2O4hetero-composite sensor were discussed in relation to the electronic sensitization due to charge transfer at Fe2O3-ZnFe2O4interface and Fe2O3-induced catalytic promotion of gas sensing reaction. The sensor can be used to monitor harmful volatile organic compounds and indoor air pollutants.

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