Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 285, Issue -, Pages 358-367Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2019.01.008
Keywords
SnO2; Pd-decoration; H-2 gas; Sensing mechanism; Gas sensor
Funding
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education [2016R1D1A1B03935228]
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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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