Abstract
Clear aluminium oxide sols without precipitation were synthesized via a non-aqueous sol–gel technique using three different alcohols (ethanol, isopropanol and n-butyl alcohol) as solvent, aluminium sec-butoxide as a precursor and acetyl acetone as a chelating agent. Although all sols could be successfully used to prepare thin films, the most stable one was prepared with n-butyl alcohol. Highly transparent, homogenous and amorphous aluminium oxide thin films were obtained on Si substrates after a heat treatment at 500 °C. X-Ray photoelectron spectroscopy (XPS) and Fourier transform infrared absorption (FT-IR) spectroscopy revealed all films were hydroxide free. The optical and structural properties of the films were particularly investigated. Any significant difference except from thickness on the film properties was not observed by changing the alcohol. Refractive index was used as an indication of the porosity of the films and ranged from 1.54 to 1.60.
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Acknowledgments
This research is supported by the Interuniversity attraction poles programme IAP/VI-17 (INANOMAT) financed by the Belgian State, Federal science policy office. We gratefully acknowledge Nico De Roo for help with XPS measurements and Jonas Feys for help with TGA/DTA measurements.
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Avci, N., Smet, P.F., Lauwaert, J. et al. Optical and structural properties of aluminium oxide thin films prepared by a non-aqueous sol–gel technique. J Sol-Gel Sci Technol 59, 327–333 (2011). https://doi.org/10.1007/s10971-011-2505-9
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DOI: https://doi.org/10.1007/s10971-011-2505-9