Oxime-modified aluminium(III) alkoxides: Potential precursors for gamma-alumina nano-powders and optically transparent alumina film

摘要

Reactions of aluminium(III) iso-propoxide with acetoxime in anhydrous benzene yielded complexes of the type [Al((OPr)-Pr-i)(3-n)(ONC(CH3)(2))(n)], where n =1, 2 or 3. These complexes were characterized by elemental analysis, FTIR and NMR (H-1, C-13, Al-27) spectral studies. Spectral studies of these complexes suggest the presence of bi-dentate mode of the oximato moieties in the solution state. Soft transformations of aluminium(III) iso-propoxide and their oxime derivatives to pure alumina were carried out by the sol-gel technique. The powder XRD patterns of all the formed alumina suggest formation of cubic phase (y-alumina) with average crystallites size of 7-30 nm. Optically transparent crack free alumina film was deposited on glass substrate using alumina sol, prepared by complex [Al((OPr)-Pr-i)(3-n)(ONC(CH3)(2)}], through dip coating method. The film sintered at 500 degrees C is amorphous in nature as indicated by XRD study. The alumina film is found to be.-95% optically transparent in the visible region..The observed particle size distribution of alumina thin film in AFM images is found to be 13 +/- 2 nm. (C) 2017 Elsevier Ltd. All rights reserved.