Room Temperature Operation of UV Photocatalytic Functionalized AlGaN/GaN Heterostructure Hydrogen Sensor
- Authors
- Choi, June-Heang; Park, Taehyun; Hur, Jaehyun; Cha, Ho-Young
- Issue Date
- Jun-2021
- Publisher
- MDPI
- Keywords
- AlGaN/GaN; Hydrogen sensor; Pd; Photocatalyst; Ultraviolet; ZnO-nanoparticles
- Citation
- Nanomaterials, v.11, no.6
- Journal Title
- Nanomaterials
- Volume
- 11
- Number
- 6
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/81584
- DOI
- 10.3390/nano11061422
- ISSN
- 2079-4991
- Abstract
- An AlGaN/GaN heterostructure based hydrogen sensor was fabricated using a dual catalyst layer with ZnO-nanoparticles (NPs) atop of Pd catalyst film. The ZnO-NPs were synthesized to have an average diameter of ~10 nm and spin coated on the Pd catalyst layer. Unlike the conventional catalytic reaction, the fabricated sensors exhibited room temperature operation without heating owing to the photocatalytic reaction of the ZnO-NPs with ultraviolet illumination at 280 nm. A sensing response of 25% was achieved for a hydrogen concentration of 4% at room temperature with fast response and recovery times; a response time of 8 s and a recovery time of 11 s. © 2021 by the authors. Licensee MDPI, Basel, Switzerland.
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