Optical and structural properties of nanocrystalline anatase (TiO2) thin films prepared by non-aqueous sol-gel dip-coating
| Autor: | H. Lipsonen, Eero Haimi, Juha Larismaa, J. Krzak-Ros, M. Kapulainen, Simo-Pekka Hannula |
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| Jazyk: | angličtina |
| Rok vydání: | 2011 |
| Předmět: |
optical properties
Anatase Materials science Scanning electron microscope thin film ta221 Analytical chemistry Dip-coating chemistry.chemical_compound Optics Optical properties Wemple-DiDomenico model Materials Chemistry Thin film ta216 Sol-gel non-aqueous sol-gel business.industry Metals and Alloys Surfaces and Interfaces Nanocrystalline material Surfaces Coatings and Films Electronic Optical and Magnetic Materials chemistry Titanium dioxide Crystallite anatase Wemple-DiDomenico model business |
| Zdroj: | Haimi, E, Lipsonen, H, Larismaa, J, Kapulainen, M, Krzak-Ros, J & Hannula, S-P 2011, ' Optical and structural properties of nanocrystalline anatase (TiO 2 ) thin films prepared by non-aqueous sol-gel dip-coating ', Thin Solid Films, vol. 519, no. 18, pp. 5882-5886 . https://doi.org/10.1016/j.tsf.2011.02.091 |
| ISSN: | 1879-2731 0040-6090 |
| DOI: | 10.1016/j.tsf.2011.02.091 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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