A room-temperature ultrasonic hydrogen sensor based on a sensitive layer of reduced graphene oxide

It is challenging to increase the sensitivity of a hydrogen sensor operating at room temperature due to weak sorption and tiny mass of hydrogen. In this work, an ultrasonic sensor is presented for detecting hydrogen, which is composed of a 128° YX-LiNbO 3 substrate and a reduced graphene oxide (RGO)...

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Bibliographic Details
Published in:Scientific reports 2021-01, Vol.11 (1), p.2404-2404, Article 2404
Main Authors: Zhang, Xue-Yu, Ma, Ren-Hao, Li, Ling-Sheng, Fan, Li, Yang, Yue-Tao, Zhang, Shu-Yi
Format: Article
Language:English
Subjects:
639/766/25
639/766/930
Conductivity
Graphene
Humanities and Social Sciences
Hydrogen
multidisciplinary
Platinum
Science
Science (multidisciplinary)
Sensors
Sorption
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Summary:It is challenging to increase the sensitivity of a hydrogen sensor operating at room temperature due to weak sorption and tiny mass of hydrogen. In this work, an ultrasonic sensor is presented for detecting hydrogen, which is composed of a 128° YX-LiNbO 3 substrate and a reduced graphene oxide (RGO) sensitive layer with a platinum catalyzer. By optimizing the depositing parameters of RGO and platinum, a considerably high sensitivity is achieved at room temperature. A frequency shift of 308.9 kHz is obtained in 100 ppm hydrogen mixed with argon, and a frequency shift of 24.4 kHz is obtained in 1000 ppm hydrogen mixed in synthetic air. It is demonstrated that in addition to strong sorption of the sensitive layer, the coaction of mass load and conductivity variation is key to high sensitivity of the sensor. By establishing the original conductivity of the sensitive layer within the “conductivity window” for enhancing electrical response, we improve the sensitivity of the ultrasonic sensor, which is available for detecting hydrogen with an extremely low concentration of 5 ppm.
ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-020-80875-0