Improving the hydrogen sensing properties of SnO2 nanowire-based conductometric sensors by Pd-decoration
- Authors
- Kim, Jae-Hun; Mirzaei, Ali; Kim, Hyoun Woo; Kim, Sang Sub
- Issue Date
- Apr-2019
- Publisher
- ELSEVIER SCIENCE SA
- Keywords
- SnO2; Pd-decoration; H-2 gas; Sensing mechanism; Gas sensor
- Citation
- SENSORS AND ACTUATORS B-CHEMICAL, v.285, pp.358 - 367
- Indexed
- SCIE
SCOPUS
- Journal Title
- SENSORS AND ACTUATORS B-CHEMICAL
- Volume
- 285
- Start Page
- 358
- End Page
- 367
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/14283
- DOI
- 10.1016/j.snb.2019.01.008
- ISSN
- 0925-4005
- Abstract
- We fabricated bare and Pd-decorated SnO2 nanowires (NWs) for comparative study of hydrogen sensing. A selective vapor-liquid-solid method was used for fabricating SnO2 NWs and a UV reduction method was used to decorate Pd NPs on the surfaces of the fabricated NWs. Sensing studies showed that decorating the surfaces of SnO2 NWs with a noble metal increased the response to 1 ppm H-2 gas from 6.88 to 16.95 at an optimal working temperature of 300 degrees C. Furthermore, Pd decoration also increased the selectivity. The enhanced sensing properties of the Pd-decorated sensor are related to the Pd NPs' catalytic effect and the formation of Schottcky junctions. This study demonstrated the possibility of a high performance H-2 sensor created by combining metal oxide NWs with a catalyst such as Pd.
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