Optical and structural properties of nanocrystalline anatase (TiO2) thin films prepared by non-aqueous sol-gel dip-coating

E. Haimi (Corresponding Author), H. Lipsonen, J. Larismaa, Markku Kapulainen, J. Krzak-Ros, S-P. Hannula

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

Anatase (TiO2) thin films were grown by non-aqueous sol-gel dip-coating using titanium (IV) n-butoxide as precursor and 1-butanol as solvent. High withdrawal speed of 4.7 mm/s in dip-coating resulted in defect free films of 100 nm average film thickness after subsequent heat treatments. According to scanning electron microscope and X-ray diffraction measurements, the films consisted of nanocrystalline anatase with 30 nm mean crystallite size. Refractive index n(λ) and extinction coefficient k(λ) were determined over the wavelength range from 200 to 1650 nm. The optical band gap of the film material was approximately 3.2 eV. The results showed very similar optical characteristics to those that are accomplished with chemically more reactive aqueous sol-gel processes. Furthermore, it was found that in addition to porosity, coordination number of Ti atoms to nearest oxygen neighbors is likely to have a significant role in explaining differences of optical properties between bulk anatase and thin film materials of the present work.
Original languageEnglish
Pages (from-to)5882-5886
Number of pages5
JournalThin Solid Films
Volume519
Issue number18
DOIs
Publication statusPublished - 2011
MoE publication typeA1 Journal article-refereed

Fingerprint

anatase
Titanium dioxide
Sol-gels
coating
Structural properties
Optical properties
gels
optical properties
Thin films
Coatings
thin films
1-Butanol
Optical band gaps
Crystallite size
Titanium
Butenes
Sol-gel process
Film thickness
Refractive index
Electron microscopes

Keywords

  • anatase
  • non-aqueous sol-gel
  • optical properties
  • thin film
  • Titanium dioxide
  • Wemple-DiDomenico model

Cite this

Haimi, E. ; Lipsonen, H. ; Larismaa, J. ; Kapulainen, Markku ; Krzak-Ros, J. ; Hannula, S-P. / Optical and structural properties of nanocrystalline anatase (TiO2) thin films prepared by non-aqueous sol-gel dip-coating. In: Thin Solid Films. 2011 ; Vol. 519, No. 18. pp. 5882-5886.
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Optical and structural properties of nanocrystalline anatase (TiO2) thin films prepared by non-aqueous sol-gel dip-coating. / Haimi, E. (Corresponding Author); Lipsonen, H.; Larismaa, J.; Kapulainen, Markku; Krzak-Ros, J.; Hannula, S-P.

In: Thin Solid Films, Vol. 519, No. 18, 2011, p. 5882-5886.

Research output: Contribution to journalArticleScientificpeer-review

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T1 - Optical and structural properties of nanocrystalline anatase (TiO2) thin films prepared by non-aqueous sol-gel dip-coating

AU - Haimi, E.

AU - Lipsonen, H.

AU - Larismaa, J.

AU - Kapulainen, Markku

AU - Krzak-Ros, J.

AU - Hannula, S-P.

PY - 2011

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N2 - Anatase (TiO2) thin films were grown by non-aqueous sol-gel dip-coating using titanium (IV) n-butoxide as precursor and 1-butanol as solvent. High withdrawal speed of 4.7 mm/s in dip-coating resulted in defect free films of 100 nm average film thickness after subsequent heat treatments. According to scanning electron microscope and X-ray diffraction measurements, the films consisted of nanocrystalline anatase with 30 nm mean crystallite size. Refractive index n(λ) and extinction coefficient k(λ) were determined over the wavelength range from 200 to 1650 nm. The optical band gap of the film material was approximately 3.2 eV. The results showed very similar optical characteristics to those that are accomplished with chemically more reactive aqueous sol-gel processes. Furthermore, it was found that in addition to porosity, coordination number of Ti atoms to nearest oxygen neighbors is likely to have a significant role in explaining differences of optical properties between bulk anatase and thin film materials of the present work.

AB - Anatase (TiO2) thin films were grown by non-aqueous sol-gel dip-coating using titanium (IV) n-butoxide as precursor and 1-butanol as solvent. High withdrawal speed of 4.7 mm/s in dip-coating resulted in defect free films of 100 nm average film thickness after subsequent heat treatments. According to scanning electron microscope and X-ray diffraction measurements, the films consisted of nanocrystalline anatase with 30 nm mean crystallite size. Refractive index n(λ) and extinction coefficient k(λ) were determined over the wavelength range from 200 to 1650 nm. The optical band gap of the film material was approximately 3.2 eV. The results showed very similar optical characteristics to those that are accomplished with chemically more reactive aqueous sol-gel processes. Furthermore, it was found that in addition to porosity, coordination number of Ti atoms to nearest oxygen neighbors is likely to have a significant role in explaining differences of optical properties between bulk anatase and thin film materials of the present work.

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KW - thin film

KW - Titanium dioxide

KW - Wemple-DiDomenico model

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