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

Jeong Min Baik, Myung Hwa Kim, Christopher Larson, Cafer T. Yavuz, Galen D. Stucky, Alec M. Wodtke, Martin Moskovits

Research output: Contribution to journalArticlepeer-review

107 Scopus citations

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.
Original languageEnglish (US)
Pages (from-to)3980-3984
Number of pages5
JournalNano Letters
Volume9
Issue number12
DOIs
StatePublished - Dec 9 2009
Externally publishedYes

ASJC Scopus subject areas

  • Bioengineering
  • Materials Science(all)
  • Chemistry(all)
  • Mechanical Engineering
  • Condensed Matter Physics

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