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Effect of the thermal treatment on the morphology and optical properties of nanosized TiO2 film

I. STAMBOLOVA1,* , V. BLASKOV1, I.N. KUZNETSOVA1, N. KOSTOVA2, S. VASSILEV3

Affiliation

  1. Institute of General and Inorganic Chemistry, BAS, Acad. G. Bonchev St, bl.11, 1113 Sofia, Bulgaria,
  2. Institute of Catalysis, BAS, Acad. G. Bonchev St, bl.11, 1113 Sofia, Bulgaria
  3. Institute of Electrochemistry and Energy Systems, BAS, Acad. G. Bonchev St, bl.10, 1113 Sofia, Bulgaria.

Abstract

Thin TiO2 films are prepared by spin coating from two types of solutions containing titanium isopropoxide with and without polyethyleneglycol. The final phase composition depends on the temperature of drying of every layer. The films obtained by drying of every layer at 120oC and 300oC contain anatase phase, while treatment of every layer at 500oC results in a mixture of anatase and brookite phase due to the diffusion of sodium from the glass substrate. The temperature of drying influences the optical properties of the films. The highest transmittance posses the films obtained after drying of every coating at 120oC and treated at 500oC. The spectra of films show a pseudo blue shift. A tendency of decreasing of the band gap energy of TiO2 sol gel films with increasing of the drying temperatures is observed..

Keywords

Titania, Thin films, Sol gel, Phase transition, Optical properties.

Submitted at: May 31, 2010
Accepted at: April 11, 2011

Citation

I. STAMBOLOVA, V. BLASKOV, I.N. KUZNETSOVA, N. KOSTOVA, S. VASSILEV, Effect of the thermal treatment on the morphology and optical properties of nanosized TiO2 film, Journal of Optoelectronics and Advanced Materials Vol. 13, Iss. 4, pp. 381-386 (2011)