Phase transformation comparison of TiO 2 nanorods and TiO 2 thin film after annealing

Yi Chen, Sang Yeol Yang, Jaehwan Kim

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

This paper reports the degree of phase transformation of titanium dioxide (TiO 2) thin film and TiO 2 nanorods before and after annealing. TiO 2 nanorods were synthesized with titanium isoproxide (TIP) in Oleic acid, having approximately 5 nm diameter and 30 nm length. TiO 2 thin film was fabricated by sol-gel method using TIP, ethanol and hydrochloric acid. The characteristics of TiO 2 nanorods and thin film were investigated with transmission electron microscope, atomic force microscope and x-ray diffraction patterns. Although the TiO 2 thin film shows no crystallite peak, as-synthesized TiO 2 nanorods show broad anatase phase diffraction peaks. After annealing the TiO 2 nanorods at 850°C for 3 h, only approximately 3.1% of crystallite phase was transformed from anatase phase to rutile phase. This slow phase transformation might be due to the small diameter of the nanorods, which is thermodynamically more stable than the anatase crystallite phase. However, although the film has small grains on the surface, approximately 59.5% of phase was transformed from anatase to rutile crystallite structure after the thin film annealing. This large amount of phase transformation might be due to the two dimensional structure of the thin film.

Original languageEnglish
Pages (from-to)301-304
Number of pages4
JournalElectronic Materials Letters
Volume8
Issue number3
DOIs
StatePublished - Jun 2012

Keywords

  • annealing
  • nanorod
  • phase transformation
  • thin film
  • titanium dioxide

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