Size effects in the structural phase transition of VO2 nanoparticles studied by surface-enhanced Raman scattering

E. U. Donev, J. I. Ziegler, R. F. Haglund, Leonard C Feldman

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

We report the first experimental application of surface-enhanced Raman scattering (SERS) to the study of the structural phase transition of vanadium dioxide (VO2). Using arrays of gold-capped VO2 nanoparticles (Au+VO2NPs) and a VO2film covered with Au islands, we obtained the temperature evolution of the SERS intensity with respect to the amount of accessible material across the monoclinic-tetragonal- monoclinic transformation cycle of VO2. The smallest Au+VO 2NPs displayed the largest deviations from the bulk transition temperatures to complete the transformation, resulting in the widest thermal hysteresis, while the Au+VO2film exhibited the narrowest hysteresis. The observed size dependence agrees qualitatively with the model of defect-induced nucleation of the VO2 transition, although the magnitude of the hysteresis width and its dependence on NP size were less pronounced than those in a previous study of elastic light scattering from bare VO2NPs. The discrepancies may stem from the creation of extrinsic nucleation sites in the VO2NPs during their high-temperature processing in the presence of the Au caps; alternatively, the hystereses of the structural and electronic transitions could each have a different dependence on size. Lastly, we correlate the size dependence of the VO2SERS intensity with the scattering efficiency of the Au nanoparticles, within the framework of a modified Mie-theory calculation.

Original languageEnglish
Article number125002
JournalJournal of Optics A: Pure and Applied Optics
Volume11
Issue number12
DOIs
Publication statusPublished - 2009

Fingerprint

Hysteresis
Raman scattering
Phase transitions
hysteresis
Raman spectra
Nanoparticles
nanoparticles
Nucleation
nucleation
Elastic scattering
Mie scattering
dioxides
stems
caps
Gold
Vanadium
Light scattering
vanadium
Superconducting transition temperature
elastic scattering

Keywords

  • AuVO
  • Gold (Au)
  • Hybrid nanoparticles
  • Hysteresis
  • Mie theory
  • Phase transition
  • Size effects
  • Surface-enhanced Raman scattering (SERS)
  • Vanadium dioxide (VO)

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Size effects in the structural phase transition of VO2 nanoparticles studied by surface-enhanced Raman scattering. / Donev, E. U.; Ziegler, J. I.; Haglund, R. F.; Feldman, Leonard C.

In: Journal of Optics A: Pure and Applied Optics, Vol. 11, No. 12, 125002, 2009.

Research output: Contribution to journalArticle

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