Ultraselective Toluene-Gas Sensor: Nanosized Gold Loaded on Zinc Oxide Nanoparticles

Koichi Suematsu, Kosuke Watanabe, Akihiro Tou, Yongjiao Sun, Kengo Shimanoe

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

Selectivity is an important parameter of resistive-type gas sensors that use metal oxides. In this study, a highly selective toluene sensor is prepared using highly dispersed gold-nanoparticle-loaded zinc oxide nanoparticles (Au-ZnO NPs). Au-ZnO NPs are synthesized by coprecipitation and calcination at 400 °C with Au loadings of 0.15, 0.5, and 1.5 mol %. The Au NPs on ZnO are about 2-4 nm in size, and exist in a metallic state. Porous gas-sensing layers are fabricated by screen printing. The responses of the sensor to 200 ppm hydrogen, 200 ppm carbon monoxide, 100 ppm ethanol, 100 ppm acetaldehyde, 100 ppm acetone, and 100 ppm toluene are evaluated at 377 °C in a dry atmosphere. The sensor response of 0.15 mol % Au-ZnO NPs to toluene is about 92, whereas its sensor responses to other combustible gases are less than 7. Such selective toluene detection is probably caused by the utilization efficiency of the gas-sensing layer. Gas diffusivity into the sensing layer of Au-ZnO NPs is lowered by the catalytic oxidation of combustible gases during their diffusion through the layer. The present approach is an effective way to improve the selectivity of resistive-type gas sensors.

Original languageEnglish
Pages (from-to)1959-1966
Number of pages8
JournalAnalytical Chemistry
Volume90
Issue number3
DOIs
Publication statusPublished - Feb 6 2018
Externally publishedYes

Fingerprint

Zinc Oxide
Toluene
Chemical sensors
Gold
Gases
Nanoparticles
Sensors
Acetaldehyde
Screen printing
Catalytic oxidation
Carbon Monoxide
Coprecipitation
Acetone
Calcination
Oxides
Hydrogen
Ethanol
Metals

All Science Journal Classification (ASJC) codes

  • Analytical Chemistry

Cite this

Ultraselective Toluene-Gas Sensor : Nanosized Gold Loaded on Zinc Oxide Nanoparticles. / Suematsu, Koichi; Watanabe, Kosuke; Tou, Akihiro; Sun, Yongjiao; Shimanoe, Kengo.

In: Analytical Chemistry, Vol. 90, No. 3, 06.02.2018, p. 1959-1966.

Research output: Contribution to journalArticle

Suematsu, Koichi ; Watanabe, Kosuke ; Tou, Akihiro ; Sun, Yongjiao ; Shimanoe, Kengo. / Ultraselective Toluene-Gas Sensor : Nanosized Gold Loaded on Zinc Oxide Nanoparticles. In: Analytical Chemistry. 2018 ; Vol. 90, No. 3. pp. 1959-1966.
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