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

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Abstract:

The Al2O3 nanocondensates of spinel-type related structures, i.e., - 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 -Al2O3. Transmission electron microscopic observations indicated the -Al2O3 follows the crystallographic relationship (100)b//(011); [001]b//[111] with relic bayerite (denoted as b). The -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 -Al2O3 composite plates have a minimum band gap as low as ∼5 eV for potential catalytic and electro-optical applications in water environment.

Keywords: BAYERITE; GAMMA-AL2O3; LATTICE CORRESPONDENCE; MICROSCOPY; NANOCONDENSATES; SELF ASSEMBLY IN WATER; SPECTRUM

Document Type: Research Article

DOI: http://dx.doi.org/10.1166/jnn.2011.3045

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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