Influence of oxygen gas concentration on hydrogen sensing of Pt/WO3 thin film prepared by sol–gel process

Yamaguchi, Yuki; Imamura, Shunji; Ito, Shigeru; Nishio, K.; Fujimoto, Kenjiro

doi:10.1016/j.snb.2015.04.020

Cited by 31 publications

(19 citation statements)

References 46 publications

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“…Pt catalyst loaded WO 3 thin film was prepared by the solgel process using tungsten hexachloride (WCl 6 ) and hydrogen hexachloroplatinate (H 2 PtCl 6 ·6H 2 O) as starting materials [14,15,21].…”

Section: Sample Preparationmentioning

confidence: 99%

Influence of temperature and humidity on the electrical sensing of Pt/WO3 thin film hydrogen gas sensor

Yamaguchi

Imamura

Nishio

et al. 2016

J. Ceram. Soc. Japan

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Platinum catalyst loaded tungsten oxide (Pt/WO 3 ) is a promising candidate as a hydrogen gas sensor material, which can detect it through optical and electrical sensing. The sensor, which can detect the hydrogen gas stably in various environments, is strongly demanded. In this study, we prepared the Pt/WO 3 thin film by the solgel method and evaluate the dependence of the hydrogen gas sensing property on measuring temperature and humidity. Hydrogen gas sensing property of Pt/WO 3 thin film was evaluated by measuring the electrical conductivity with humid (0100% of relative humidity) hydrogen gas exposure at various temperatures. The sensing property was declined in humid atmospheres because the water molecule adsorbing on the film surface disturbed the catalytic reaction between hydrogen and Pt surface. In addition, the catalytic combustion of hydrogen molecule on Pt was also disturbed by the adsorbed water. However, the heating at 60°C can remove the effect of water molecule and the film can detect hydrogen gas stably. From these results, it was considered that the degradation of sensor response in humid atmosphere was mainly dominated by adsorbing water on Pt catalyst surface.

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Section: Sample Preparationmentioning

confidence: 99%

Influence of temperature and humidity on the electrical sensing of Pt/WO3 thin film hydrogen gas sensor

Yamaguchi

Imamura

Nishio

et al. 2016

J. Ceram. Soc. Japan

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“…Using the optical and the electrical sensing, Pt/WO 3 can detect the wide concentration range of hydrogen gas by only one material. 15),16) Moreover, the optical sensing has an advantage that it is safer because it can detect the hydrogen gas without an electrical circuit.…”

Section: )7)mentioning

confidence: 99%

Improvement of hydrogen gas sensing property of the sol–gel derived Pt/WO3 thin film by Ti-doping

Yamaguchi

Nemoto

Ito

et al. 2015

J. Ceram. Soc. Japan

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Platinum nano particles dispersed tungsten trioxide (Pt/WO 3 ) is a promising hydrogen gas sensor material which can detect it by the change of color. Hydrogen gas sensing properties of Pt/WO 3 thin film strongly depend on its film structure. Particularly, the porosity and the particle size of WO 3 are very important for obtaining good hydrogen sensitivity. The morphology of Pt/WO 3 thin film prepared by solgel process can be modified by the heat-treatment temperature and the Ti-doping to WO 3 . Pt/WO 3 thin films consisting of small particles and porous structure were obtained by Ti-doping. Especially, Ti-doping was very effective to obtain the small WO 3 particle in spite of a high temperature heat treatment. It was considered that Ti-doping produced oxygen vacancy in WO 3 lattice and this disturbed the densification of the film and the grain growth of WO 3 . This sample showed a good response to hydrogen gas exposure, compared with that of non-doped sample. Therefore, it was found that the surface modification by Ti-doping can enhance the optical hydrogen gas sensing property of Pt/WO 3 .

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“…Thus, the color of the film changed to dark blue. The relevant reaction can be written as follows [92]:…”

Section: Appl Sci 2019 9 X For Peer Review 6 Of 22mentioning

confidence: 99%

Gasochromic WO3 Nanostructures for the Detection of Hydrogen Gas: An Overview

Mirzaei

Kim

et al. 2019

Applied Sciences

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Hydrogen is one of the most important gases that can potentially replace fossil fuels in the future. Nevertheless, it is highly explosive, and its leakage should be detected by reliable gas sensors for safe operation during storage and usage. Most hydrogen gas sensors operate at high temperatures, which introduces the risk of hydrogen explosion. Gasochromic WO3 sensors work based on changes in their optical properties and color variation when exposed to hydrogen gas. They can work at low or room temperatures and, therefore, are good candidates for the detection of hydrogen leakage with low risk of explosion. Once their morphology and chemical composition are carefully designed, they can be used for the realization of sensitive, selective, low-cost, and flexible hydrogen sensors. In this review, for the first time, we discuss different aspects of gasochromic WO3 gas sensor-based hydrogen detection. Pristine, heterojunction, and noble metal-decorated WO3 nanostructures are discussed for the detection of hydrogen gas in terms of changes in their optical properties or visible color. This review is expected to provide a good background for research work in the field of gas sensors.

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Influence of oxygen gas concentration on hydrogen sensing of Pt/WO3 thin film prepared by sol–gel process

Cited by 31 publications

References 46 publications

Influence of temperature and humidity on the electrical sensing of Pt/WO<sub>3</sub> thin film hydrogen gas sensor

Influence of temperature and humidity on the electrical sensing of Pt/WO<sub>3</sub> thin film hydrogen gas sensor

Improvement of hydrogen gas sensing property of the sol–gel derived Pt/WO<sub>3</sub> thin film by Ti-doping

Gasochromic WO3 Nanostructures for the Detection of Hydrogen Gas: An Overview

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Influence of oxygen gas concentration on hydrogen sensing of Pt/WO3 thin film prepared by sol–gel process

Cited by 31 publications

References 46 publications

Influence of temperature and humidity on the electrical sensing of Pt/WO<sub>3</sub> thin film hydrogen gas sensor

Influence of temperature and humidity on the electrical sensing of Pt/WO<sub>3</sub> thin film hydrogen gas sensor

Improvement of hydrogen gas sensing property of the sol&ndash;gel derived Pt/WO<sub>3</sub> thin film by Ti-doping

Gasochromic WO3 Nanostructures for the Detection of Hydrogen Gas: An Overview

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Improvement of hydrogen gas sensing property of the sol–gel derived Pt/WO<sub>3</sub> thin film by Ti-doping