The role of the laser fluence on the Al 2 O 3 target in the nanostructure and morphology of VO x :Al 2 O 3 thin films prepared by pulsed laser deposition

S. Núñez-Sánchez*, R. Serna, A. K. Petford-Long, M. Tanase

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

The role played by the laser fluence on the Al 2 O 3 target when depositing VO x :Al 2 O 3 nanocomposite thin films by alternate ablation from ceramic alumina (Al 2 O 3 ) and metallic vanadium (V) targets in vacuum has been studied. The fluence and number of pulses on the V target to prepare the nanoparticles has been maintained constant, while the fluence used to grow the Al 2 O 3 host has been varied from 1.3 to 3.9 J cm -2 . The optical properties of the films, namely in-situ reflectivity during growth and extinction coefficient, evidence that the properties of the nanoparticles change as a function of the laser fluence on the Al 2 O 3 host. Transmission electron microscopy analysis shows the formation of vanadium oxide nanoparticles with average diameters in the range of 4.6 nm. Structural analysis of the nanoparticles shows that they are mainly crystalline. Phases of VO x with average [O]/[V] ratios from 1.7 to 2.2 have been identified with the most commonly observed being V 3 O 5 . This is in agreement with low heat of formation of this oxide. It is shown that the oxidation of the nanoparticles induced during the deposition of Al 2 O 3 is very efficient since no metallic V nanoparticles are formed even for the lowest fluence used.

Original languageEnglish (US)
Pages (from-to)1316-1321
Number of pages6
JournalApplied Surface Science
Volume254
Issue number4
DOIs
StatePublished - Dec 15 2007

Keywords

  • Nanoparticles
  • PLD
  • Pulsed laser deposition
  • Vanadium oxide

ASJC Scopus subject areas

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

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