Metal-insulator transition characteristics of vanadium dioxide thin films synthesized by ultrasonic nebulized spray pyrolysis of an aqueous combustion mixture

R. Bharathi, Rameshwari Naorem, A. M. Umarji

Research output: Contribution to journalArticlepeer-review

26 Scopus citations

Abstract

We report the synthesis of high quality vanadium dioxide (VO2) thin films by a novel spray pyrolysis technique, namely ultrasonic nebulized spray pyrolysis of aqueous combustion mixture (UNSPACM). This simple and cost effective two step process involves synthesis of a V2O5 film on an LaAlO3 substrate followed by a controlled reduction to form single phase VO2. The formation of M1 phase (P21/c) is confirmed by Raman spectroscopic studies. A thermally activated metal-insulator transition (MIT) was observed at 61 °C, where the resistivity changes by four orders of magnitude. Activation energies for the low conduction phase and the high conduction phase were obtained from temperature variable resistance measurements. The infrared spectra also show a dramatic change in reflectance from 13% to over 90% in the wavelength range of 7-15 μm. This indicates the suitability of the films for optical switching applications at infrared frequencies.

Original languageEnglish
Article number305103
JournalJournal Physics D: Applied Physics
Volume48
Issue number30
DOIs
StatePublished - 5 Aug 2015
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2015 IOP Publishing Ltd.

Keywords

  • LAO
  • MIT
  • UNSPACM
  • VO

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