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Electrothermally induced highly responsive and highly selective vanadium oxide hydrogen sensor based on metal-insulator transition

Title
Electrothermally induced highly responsive and highly selective vanadium oxide hydrogen sensor based on metal-insulator transition
Authors
Byon J.W.Kim M.-B.Kim M.H.Kim S.Y.Lee S.H.Lee B.C.Baik J.M.
Ewha Authors
김명화
SCOPUS Author ID
김명화scopus
Issue Date
2012
Journal Title
Journal of Physical Chemistry C
ISSN
1932-7447JCR Link
Citation
vol. 116, no. 1, pp. 226 - 230
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
We report highly effective hydrogen gas detection based on the metal-insulator transition (MIT) by the electrothermally induced Pd-nanoparticles-decorated vanadium oxide (VO 2) nanowire prepared by the efficient and size-controllable growth method originating from V 2O 5 thin film driven by supercooled liquid nanodroplets. By irradiating a well-defined electron beam into the nanowires, we could significantly increase the conductivity up to four times with only a modest change in the semiconductor-to-metal transition temperature (<2 °C). When exposed to trace amounts of hydrogen gas in a single nanowire configuration, the enhanced conductivity gave rise to about a two times as fast transition to metallic phase even near room temperature (∼35 °C), by reaching much faster (∼3×) a critical current density at which the self-heating initiates. Consequently, we achieved the greatly shorter response time as well as lower operating temperature and voltage for the detection of hydrogen gas in a single VO 2 nanowire device, which can be attributed to the self-heating effect accelerated by the increase in the conductivity. The single nanowire sensor also shows the capability of detecting selectively hydrogen of different three gases (O 2, CO, and ethylene). © 2011 American Chemical Society.
DOI
10.1021/jp2080989
Appears in Collections:
자연과학대학 > 화학·나노과학전공 > Journal papers
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