Vanadium-Al 2 O 3 nanostructured thin films prepared by pulsed laser deposition: Optical switching

S. Núñez-Sánchez*, R. Serna, M. Jiménez de Castro, J. García López, A. K. Petford-Long, J. F. Morhange

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

The formation and optical response of VO x nanoparticles embedded in amorphous aluminium oxide (Al 2 O 3 ) thin films by pulsed laser deposition is studied. The thin films have been grown by alternate laser ablation of V and Al 2 O 3 targets, which has resulted in a multilayer structure with embedded nanoparticles. The V content has been varied by changing the number of pulses on the V target. It is found that VO x nanoparticles with dimensions around 5 nm have been formed. The structural analysis shows that the vanadium nanoparticles are oxidized, although probably there is not a unique oxide phase for each sample. The films show a different optical response depending on their vanadium content. Optical switching as a function of temperature has been observed for the two films with the highest vanadium content, at transition temperatures of about -20 °C and 315 °C thus suggesting the presence of nanoparticles with compositions V 4 O 7 and V 2 O 5 , respectively.

Original languageEnglish (US)
Pages (from-to)8136-8140
Number of pages5
JournalApplied Surface Science
Volume253
Issue number19
DOIs
StatePublished - Jul 31 2007

Keywords

  • Nanoparticles
  • Optical switching
  • Pulsed laser deposition
  • Vanadium

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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