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Author

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

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Pd-Sensitized Single Vanadium Oxide Nanowires: Highly Responsive Hydrogen Sensing Based on the Metal-insulator Transition

Cited 57 times inthomson ciCited 51 times inthomson ci
Title
Pd-Sensitized Single Vanadium Oxide Nanowires: Highly Responsive Hydrogen Sensing Based on the Metal-insulator Transition
Author
Baik, Jeong MinKim, Myung HwaLarson, ChristopherYavuz, Cafer T.Stucky, Galen D.Wodtke, Alec M.Moskovits, Martin
Keywords
Atomic hydrogen; Current increase; Dissociative chemisorption; Electron phonon couplings; High-sensitivity; Hydrogen gas; Hydrogen sensor; Hydrogen-sensing; Initial process; Insulator-to-metal transitions; Trace amounts; Two time scale; Vanadium dioxide; Vanadium oxides; Vibrational normal modes
Issue Date
200912
Publisher
AMER CHEMICAL SOC
Citation
NANO LETTERS, v.9, no.12, pp.3980 - 3984
Abstract
Exceptionally sensitive hydrogen sensors were produced using Pd-nanoparticle-decorated, single vanadium dioxide nanowires. The highsensitivity arises from the large downward shift in the insulator to metal transition temperature following the adsorption on and incorporation of atomic hydrogen, produced by dissociative chemisorption on Pd, in the VO2, producing ∼1000-fold current increases. During a rapid initial process, the insulator to metal transition temperature is decreased by >10 °C even when exposed to trace amounts of hydrogen gas. Subsequently, hydrogen continues to diffuse into the VO2 for several hours before saturation is achieved with only a modest change in the insulator to metal transition temperature but with a significant increase in the conductivity. The two time scales over which H-related processes occur in VO2 likely signal the involvement of two distinct mechanisms influencing the electronic structure of the material one of which involves electron-phonon coupling pursuant to the modification of the vibrational normal modes of the solid by the introduction of H as an impurity.
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DOI
http://dx.doi.org/10.1021/nl902020t
ISSN
1530-6984
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