Hydrogen Sensing under Ambient Conditions Using SnO sub(2) Nanowires: Synergetic Effect of Pd/Sn Codeposition

Semiconducting SnO sub(2) nanowires deposited with Pd and Sn nanoparticles on their surface are shown to be a highly sensitive hydrogen sensor with fast response time at room temperature. Compared with the SnO sub(2) nanowire deposited with Pd or Sn nanoparticles alone, the Pd/Sn-deposited SnO sub(2...

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Bibliographic Details
Published in:Nano letters 2013-02, Vol.13 (12), p.5938-5943-5938-5943
Main Authors: Jeong, Seung Ho, Kim, Sol, Cha, Junho, Son, Min Soo, Park, Sang Han, Kim, Ha-Yeong, Cho, Man Ho, Whangbo, Myung-Hwan, Yoo, Kyung-Hwa, Kim, Sung-Jin
Format: Article
Language:English
Subjects:
Codeposition
Deposition
Nanoparticles
Nanowires
Palladium
Tin
Tin dioxide
Tin oxides
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Summary:Semiconducting SnO sub(2) nanowires deposited with Pd and Sn nanoparticles on their surface are shown to be a highly sensitive hydrogen sensor with fast response time at room temperature. Compared with the SnO sub(2) nanowire deposited with Pd or Sn nanoparticles alone, the Pd/Sn-deposited SnO sub(2) nanowire exhibits a significant improvement in the sensitivity and reversibility of sensing hydrogen gas in the air at room temperature. Our investigation indicates that two factors are responsible for the synergistic effect of Pd/Sn codeposition on SnO sub(2) nanowires. One is that in the presence of Pd the oxidation of Sn nanoparticles on the surface of the SnO sub(2) nanowire is incomplete leading only to suboxides SnO sub(x) (1 less than or equal to x < 2), and the other is that the surface of the Pd/Sn-deposited SnO sub(2) nanowire is almost perfectly hydrophobic.
ISSN:1530-6984
1530-6992
DOI:10.1021/nl402998g