Journal
SUPERLATTICES AND MICROSTRUCTURES
Volume 63, Issue -, Pages 47-57Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.spmi.2013.08.007
Keywords
ZnO micropyramids; Photodegradation; Methylene blue; Photoluminescence
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Funding
- UKM [UKM-DIP-2012-04, UKM-OUP-2012-074]
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The present article reports the synthesis, characterization and photocatalytic performance of highly oriented three dimensional ZnO micropyramids obtained by the surfactant assisted precipitation hydrothermal treatment. Pluronic P-123 triblock copolymer was the surfactant employed in the present synthesis. The synthesized ZnO material was characterized for its phase and morphological studies. X-ray diffraction patterns suggested the formation of pure hexagonal wurtzite phase with the mean crystalline size of 39 nm. Electron microscopic studies of the material revealed the hexagonal micropyramid like 'morphology with an approximate size of 1-3 mu m and the ZnO was found to be single crystalline by the SAED analysis. The ZnO micropyramids provided a bimodal mesoporous texture with a low specific surface area (4.5 m(2)/g). Optical properties investigated using the photoluminescence spectrum indicated that the ZnO has a broad UV and blue emission bands which were attributed due to the annihilation of excitons, and a broad visible green emission corresponds to the oxygen interstitial defects. Under the UV light illumination, several concentrations of methylene blue were degraded completely over the as-synthesized ZnO microcrystals for repeated cycles. (C) 2013 Elsevier Ltd. All rights reserved.
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