Hybrid Hydrogen Sensor Based on Pd/WO3 Showing Simultaneous Chemiresistive and Gasochromic Response

Sanghoon Kim; Bohee Maeng; Yijun Yang; Kwanwoo Kim; Daewoong Jung

doi:10.3390/nano13182563

Hybrid Hydrogen Sensor Based on Pd/WO₃ Showing Simultaneous Chemiresistive and Gasochromic Response

Nanomaterials (Basel). 2023 Sep 15;13(18):2563. doi: 10.3390/nano13182563.

Authors

Sanghoon Kim¹, Bohee Maeng¹, Yijun Yang¹, Kwanwoo Kim¹, Daewoong Jung¹

Affiliation

¹ Advanced Mechatronics R&D Group, Korea Institute of Industrial Technology (KITECH), Daegu 42994, Republic of Korea.

Abstract

The gasochromism of WO₃, wherein the color of the material changes according to the reaction of gas, can immediately allow for the determination of the presence of hydrogen by the naked eye. We have also developed a hybrid hydrogen sensor for WO₃, a metal oxide, that can simultaneously utilize its gasochromic response and resistance to hydrogen. Because the proposed sensor has a transparent electrode on a glass substrate, it is a structure that can not only reveal the change in resistance but also more clearly illustrate the gasochromic response. A hybrid sensing demonstration in a hydrogen leak environment was successfully performed to verify a sensor that was capable of utilizing the resistive and gasochromic response of WO₃.

Keywords: gasochromic hybrid gas sensor; gasochromic hybrid hydrogen sensor; gasochromic hydrogen sensor; hybrid hydrogen sensor; hydrogen sensor.

Grants and funding

This study has been conducted with the support of the Korea Institute of Industrial Technology under “Development of a thermal convection-type flow sensor with high-sensitivity for emergency patients breathing monitoring in real-time” (Kitech UI-23-0012). This work was supported by the Korea Innovation Foundation (INNOPOLIS) grant, which was funded by the Korean government (MSIT) (2020-DD-UP-0348). This work was supported by the Technology Innovation Program (No. 155736, Development of Miniaturized Sensor Module Technology for Non-invasive Arterial Blood Carbon Dioxide Real-time Monitoring) funded by the Ministry of Trade, Industry, and Energy (MOTIE, Korea).