Pt/Graphene Catalyst and Tellurium Nanowire-Based Thermochemical Hydrogen (TCH) Sensor Operating at Room Temperature in Wet Air
- Authors
- Hwang, Tae-Yeon; Go, Gwang-Myeong; Park, Siwoo; Lee, Jimin; Song, Yoseb; Kim, Seil; Cho, Hong-Baek; Choa, Yong-Ho
- Issue Date
- Dec-2019
- Publisher
- American Chemical Society
- Keywords
- hydrogen gas sensor; tellurium nanowires; thermoelectric gas sensor; Pt-decorated graphene; hydrogen oxidation catalyst
- Citation
- ACS Applied Materials and Interfaces, v.11, no.50, pp.47015 - 47024
- Indexed
- SCIE
SCOPUS
- Journal Title
- ACS Applied Materials and Interfaces
- Volume
- 11
- Number
- 50
- Start Page
- 47015
- End Page
- 47024
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/182083
- DOI
- 10.1021/acsami.9b12604
- ISSN
- 1944-8244
- Abstract
- We present a thermochemical hydrogen (TCH) gas sensor fabricated with Pt-decorated exfoliated graphene sheets and a tellurium nanowire-based thermoelectric (TNTE) layer operating at room temperature in wet air. The sensor device was able to detect 50 ppm to 3% of hydrogen gas within several seconds (response/recovery times of 6/5.1 s at 4000 ppm of hydrogen gas) at room temperature due to the relatively high surface area of homogeneously dispersed Pt nanocrystals (similar to 8 nm) decorated on graphene sheets and the excellent Seebeck coefficient (428 mu 4V/K) of the TNTE layer. Furthermore, it was observed that the effect of the relative humidity on sensing properties was greatly minimized by incorporating Pt-decorated graphene sheets. These results indicate that our device has great potential as a low power consumption gas sensor for IoTs.
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