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Journal of Materials Science

, Volume 24, Issue 1, pp 192–198 | Cite as

Preparation of VO2 films by organometallic chemical vapour deposition and dip-coating

  • Yasutaka Takahashi
  • Masaaki Kanamori
  • Hiroyuki Hashimoto
  • Yoshimitsu Moritani
  • Yoshihiro Masuda
Papers

Abstract

Low-pressure organometallic chemical vapour deposition (OMCVD) and dip-coating of VO2 films using vanadyl tri(isobutoxide) as the starting material were investigated. In OMCVD, discontinuous VO2 films, which were composed of fine needle crystals, formed under very limited conditions, around 600° C with a flow rate of oxygen gas of 0.2 to 0.5 cm3 sec−1. However, very uniform and tightly packed VO2 films were grown by deposition at 300 to 700° C in the absence of oxygen gas and subsequent annealing in nitrogen at 500° C for 2 h. The films exhibited a sharp semiconductor to metal transition at 60 to 70° C, accompanied by a change in the resistivity by four to five orders of magnitude. In dip-coating with two-step heat-treatments (300° C for 1 h in nitrogen and subsequently 500° C for 2 h in nitrogen), of the gel films formed from VO(O-i-Bu)3-H2O-i-PrOH system, uniform (0 1 1) oriented VO2 films were formed. A transition in the electrical conductivity by two to two and a half orders of the magnitude was found to occur around 60° C. Before and after the transition, no distinct variation in the XRD pattern was observed.

Keywords

Oxygen Nitrogen Polymer Electrical Conductivity Chemical Vapour Deposition 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Chapman and Hall Ltd 1989

Authors and Affiliations

  • Yasutaka Takahashi
    • 1
  • Masaaki Kanamori
    • 1
  • Hiroyuki Hashimoto
    • 2
  • Yoshimitsu Moritani
    • 2
  • Yoshihiro Masuda
    • 2
  1. 1.Department of Industrial Chemistry, Faculty of EngineeringGifu UniversityGifuJapan
  2. 2.Department of Research and DevelopmentMitsui Petrochemical Industries LtdYamaguchiJapan

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