Journal
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
Volume 315, Issue 1-3, Pages 294-298Publisher
ELSEVIER
DOI: 10.1016/j.colsurfa.2007.08.010
Keywords
Bi4Ti3O12 nanoplates; photoluminescence
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Bismuth titanate (Bi4Ti3O12) nanoplates were synthesized by polyethylene glycol-assisted hydrothermal method at 200 degrees C. The as-prepared samples were investigated by X-ray powder diffraction, scanning electron microscopy, transmission electron microscopy, high-resolution transmission electron microscopy and the room-temperature photolummescence. The Bi4Ti3O12 nanoplates are single crystalline and orthorhombic perovskite structure with the average rim sizes of about 200 nm and thickness of 10-20 nm. One blue-green photoluminescence band centered at around 470.4 nm was observed at room temperature. The investigation of the effects of the annealing temperatures on room-temperature visible emission showed that the annealing temperatures or grain size play important roles for the intensities of blue-green light emission, and the oxygen vacancies should be responsible for this emission. (c) 2007 Elsevier B.V. All rights reserved.
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