Effect of solution composition on anatase to rutile transformation of sprayed TiO2 thin films

Albert Owino Juma, Ilona Oja Acik, Valdek Mikli, Arvo Mere, Malle Krunks

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Acetylacetone is used as a chelating agent for titanium(IV) isopropoxide to inhibit hydrolysis and stabilize the precursor solution. The effect of the molar ratio between titanium(IV) isopropoxide and acetylacetone of 1:1, 1:2, 1:3 and 1:4 in the precursor solution on the morphological, structural and optical properties of TiO2 thin film was investigated. These properties were studied using Fourier transformed infrared spectroscopy, scanning electron microscopy, Raman spectroscopy, X-ray diffraction and UV-vis spectroscopy as a function of the molar ratios for the as-deposited thin films and films annealed at temperatures of 700, 800 and 950 °C. Mixed anatase and rutile phases were detected after annealing at 800 °C for 1:1 and 1:2 molar ratios and at 700 °C for 1:3 and 1:4 molar ratios. The optical band gap decreased from 3.45 to 3.02 eV with an increase in the annealing temperature in agreement with corresponding structural changes.

Original languageEnglish
Pages (from-to)287-292
Number of pages6
JournalThin Solid Films
Volume594
DOIs
Publication statusPublished - Jan 1 2015

Fingerprint

anatase
rutile
Titanium dioxide
acetylacetone
Titanium
Annealing
Thin films
Optical band gaps
Chelating Agents
thin films
titanium
Chelation
Ultraviolet spectroscopy
Chemical analysis
Raman spectroscopy
Structural properties
Infrared spectroscopy
Hydrolysis
annealing
Optical properties

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry

Cite this

Juma, Albert Owino ; Acik, Ilona Oja ; Mikli, Valdek ; Mere, Arvo ; Krunks, Malle. / Effect of solution composition on anatase to rutile transformation of sprayed TiO2 thin films. In: Thin Solid Films. 2015 ; Vol. 594. pp. 287-292.
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Effect of solution composition on anatase to rutile transformation of sprayed TiO2 thin films. / Juma, Albert Owino; Acik, Ilona Oja; Mikli, Valdek; Mere, Arvo; Krunks, Malle.

In: Thin Solid Films, Vol. 594, 01.01.2015, p. 287-292.

Research output: Contribution to journalArticle

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T1 - Effect of solution composition on anatase to rutile transformation of sprayed TiO2 thin films

AU - Juma, Albert Owino

AU - Acik, Ilona Oja

AU - Mikli, Valdek

AU - Mere, Arvo

AU - Krunks, Malle

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AB - Acetylacetone is used as a chelating agent for titanium(IV) isopropoxide to inhibit hydrolysis and stabilize the precursor solution. The effect of the molar ratio between titanium(IV) isopropoxide and acetylacetone of 1:1, 1:2, 1:3 and 1:4 in the precursor solution on the morphological, structural and optical properties of TiO2 thin film was investigated. These properties were studied using Fourier transformed infrared spectroscopy, scanning electron microscopy, Raman spectroscopy, X-ray diffraction and UV-vis spectroscopy as a function of the molar ratios for the as-deposited thin films and films annealed at temperatures of 700, 800 and 950 °C. Mixed anatase and rutile phases were detected after annealing at 800 °C for 1:1 and 1:2 molar ratios and at 700 °C for 1:3 and 1:4 molar ratios. The optical band gap decreased from 3.45 to 3.02 eV with an increase in the annealing temperature in agreement with corresponding structural changes.

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