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Formation of (H+, Al+, Al2+) Co-Doped Bayerite and γ-Al2O3 Plates from Spinel-Type Related Nanocondensates in Water

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The Al2O3 nanocondensates of spinel-type related structures, i.e., γ- and -type with a significant internal compressive stress via pulsed laser ablation in water were subjected to prolonged dwelling in water to form columnar bayerite plates for further transformation as platy γ-Al2O3. Transmission electron microscopic observations indicated the γ-Al2O3 follows the crystallographic relationship (100)b//(011) γ ; [001]b//[111] γ with relic bayerite (denoted as b). The γ-Al2O3 also shows {111} twin/faults and rock salt-type domains due to dehydroxylation of bayerite which involves {111} shuffling and disordering of the Al ions in the octahedral and tetrahedral sites. The combined evidences of X-ray photoelectron spectroscopy, vibrational spectroscopy and UV-visible absorbance indicated that the H+, Al+ and Al2+ co-doped bayerite and γ-Al2O3 composite plates have a minimum band gap as low as ∼5 eV for potential catalytic and electro-optical applications in water environment.
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Document Type: Research Article

Publication date: January 1, 2011

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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