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Proceedings Paper

Preparation of amorphous Al2O3 films by the sol-gel process
Author(s): Nilgun Ozer; John P. Cronin; Antoni P. Tomsia
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Paper Abstract

Alumina, Al2O3, films were prepared by the sol-gel process and deposited by spin coating technique. The coating solutions were synthesized by using aluminum-sec butoxide, Al(OSBu)3, as a precursor, isopropanol as a solvent, acetylacetone, AcAcH, as a chelating agent and nitric acid, HNO3 as catalyzer. Highly transparent alumina coatings with thickness in the range of 100 - 700 nm were prepared at different spinning rates and heat treated at 400 degree(s)C. The morphology, microstructure, transmittance characteristics of the films were investigated. The investigations were performed by optical and Fourier infrared spectroscopy, scanning electron microscopy (SEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). SEM examinations and spectrophotometric measurements show that the films were homogeneous and uniform with a visible light transmittance higher than 90%. XRD of the alumina films heat treated at the temperatures below 500 degree(s)C showed that they had an amorphous structure. XPS examination showed that amorphous films were stoichiometric Al2O3.

Paper Details

Date Published: 11 October 1999
PDF: 7 pages
Proc. SPIE 3789, Solar Optical Materials XVI, (11 October 1999); doi: 10.1117/12.367572
Show Author Affiliations
Nilgun Ozer, Istanbul Univ. (United States)
John P. Cronin, Schott-Donnelly LLC (United States)
Antoni P. Tomsia, Lawrence Berkeley National Lab. (United States)

Published in SPIE Proceedings Vol. 3789:
Solar Optical Materials XVI
Carl M. Lampert; Claes-Goeran Granqvist, Editor(s)

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