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Baik, Jeong Min
Nano Energy and Environmental Materials Lab
Research Interests
  • Nanogenerators, antimicrobial material, catalysis, smart sensors

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Electrothermally Induced Highly Responsive and Highly Selective Vanadium Oxide Hydrogen Sensor Based on Metal-Insulator Transition

Cited 8 times inthomson ciCited 10 times inthomson ci
Title
Electrothermally Induced Highly Responsive and Highly Selective Vanadium Oxide Hydrogen Sensor Based on Metal-Insulator Transition
Author
Byon, Ji WonKim, Min-BinKim, Myung HwaKim, Sung YoubLee, Sang HyunLee, Byung CheolBaik, Jeong Min
Keywords
Enhanced conductivity; Fast transition; Growth method; Hydrogen gas; Hydrogen gas detection; Hydrogen sensor; Metallic phase; Nanowire devices; Near room temperature; Operating temperature; Self-heating; Self-heating effect; Semiconductor-to-metal transitions; Single nanowires; Supercooled liquids; Trace amounts; Vanadium oxides
Issue Date
201201
Publisher
AMER CHEMICAL SOC
Citation
JOURNAL OF PHYSICAL CHEMISTRY C, v.116, no.1, pp.226 - 230
Abstract
We report highly effective hydrogen gas detection based on the metal insulator transition (MIT) by the electrothermally induced Pd-nanoparticles-decorated vanadium oxide (VO2) nanowire prepared by the efficient and size-controllable growth method originating from V2O5 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 degrees 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 (similar to 35 degrees C), by reaching much faster (similar to 3x) 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 VO2 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).
URI
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DOI
http://dx.doi.org/10.1021/jp2080989
ISSN
1932-7447
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MSE_Journal Papers

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