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The gasochromism of WO, 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 WO, 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 WO.
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http://dx.doi.org/10.3390/nano13182563 | DOI Listing |
ACS Sens
July 2025
Zhejiang Key Laboratory of Flow Measurement Technology, China Jiliang University, Xueyuan Street 258, Hangzhou 310018, China.
Hydrogen gasochromic sensors, which detect hydrogen gas (H) through naked-eye visible color changes, have special advantages such as intrinsically safe properties and less reliance on measuring instruments. To achieve room-temperature detection, hydrogen gasochromic sensors usually require catalysts such as palladium (Pd) and gasochromic materials such as oxide-containing hexavalent tungsten. However, most existent hydrogen gasochromic sensors directly expose their catalysts and sensing materials to the outer environments, which may lower their durability and environmental suitability.
View Article and Find Full Text PDFACS Sens
October 2024
School of Physical Science and Technology, Lanzhou University, 222 South Tianshui Road, Lanzhou 730000, China.
Transition metal oxide semiconductors have great potential for use in H sensors, but in recent years, the strange phenomena about gas-sensitive performance associated with their special properties have been more widely discussed in research. In some cases, the resistance of transition metal oxide gas sensors will emerge with some changes contrary to their intrinsic semiconductor characteristics, especially in gas sensor research of WO. Based on the hydrothermal synthesis of WO, our work focuses on the abnormal change of tungsten oxide resistance to different gases at low temperature (80-200 °C) and high temperature (above 200 °C).
View Article and Find Full Text PDFSmall
August 2024
Department of Materials Science and Engineering, Research Institute of Advanced Materials, Seoul National University, Seoul, 08826, Republic of Korea.
Polymers (Basel)
November 2023
Department of Chemical and Materials Engineering, Chang Gung University, Taoyuan 33302, Taiwan.
Volatile organic compounds (VOCs), often invisible but potentially harmful, are prevalent in industrial and laboratory settings, posing health risks. Detecting VOCs in real-time with high sensitivity and low detection limits is crucial for human health and safety. The optical sensor, utilizing the gasochromic properties of sensing materials, offers a promising way of achieving rapid responses in ambient environments.
View Article and Find Full Text PDFNanomaterials (Basel)
September 2023
Advanced Mechatronics R&D Group, Korea Institute of Industrial Technology (KITECH), Daegu 42994, Republic of Korea.
The gasochromism of WO, 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 WO, 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.
View Article and Find Full Text PDF