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Pd-Sensitized single vanadium oxide nanowires: Highly responsive hydrogen sensing based on the metal-insulator transition

Title
Pd-Sensitized single vanadium oxide nanowires: Highly responsive hydrogen sensing based on the metal-insulator transition
Authors
Baik J.M.Kim M.H.Larson C.Yavuz C.T.Stucky G.D.Wodtke A.M.Moskovits M.
Ewha Authors
김명화
SCOPUS Author ID
김명화scopus
Issue Date
2009
Journal Title
Nano Letters
ISSN
1530-6984JCR Link
Citation
vol. 9, no. 12, pp. 3980 - 3984
Indexed
SCI; SCIE; SCOPUS scopus
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. © 2009 American Chemical Society.
DOI
10.1021/nl902020t
Appears in Collections:
자연과학대학 > 화학·나노과학전공 > Journal papers
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