Preparation of amorphous Al2O3 films by the sol-gel process

Nilgun Ozer; John P. Cronin; Antoni P. Tomsia

doi:10.1117/12.367572

11 October 1999 Preparation of amorphous Al2O3 films by the sol-gel process

Nilgun Ozer, John P. Cronin, Antoni P. Tomsia

Proceedings Volume 3789, Solar Optical Materials XVI; (1999) https://doi.org/10.1117/12.367572
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1999, Denver, CO, United States

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(O^SBu)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.

Citation Download Citation

Nilgun Ozer, John P. Cronin, and Antoni P. Tomsia "Preparation of amorphous Al2O3 films by the sol-gel process", Proc. SPIE 3789, Solar Optical Materials XVI, (11 October 1999); https://doi.org/10.1117/12.367572

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