Zinc/ZnO core-shell hexagonal nanodisk dendrites and their photoluminescence
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AbstractWe report the electrodeposition of novel zinc dendrites composed of self-assembled regular hexagonal zinc nanodisks shelled with ZnO layers. The Zn nanodisks range in diameter from about 100 nm to several hundreds of nanometers and are about 20-40 nm thick. The thickness of ZnO layer is about 3-4 nm. In the as-prepared condition, the photoluminescence (PL) spectra of the dendrites are composed of a violet emission band at about 415 nm and a green emission band at about 550 nm at room temperature. The violet and green emissions are attributed to the radiative recombination of a delocalized electron close to the conduction band with a deeply trapped hole in the V-Zn(-) and V-O(+) centers, respectively. The PL of the dendrites can be tuned by heat treatment. With an increase in the heating temperature, the intensity of the green emission increases, while the intensity of the violet emission decreases. (C) 2007 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
All Author(s) ListZhang XY, Dai JY, Lam CH, Wang HT, Webley PA, Li Q, Ong HC
Journal nameActa Materialia
Volume Number55
Issue Number15
Pages5039 - 5044
LanguagesEnglish-United Kingdom
Keywordscrystal growth; electron microscopy; nanostructure; photoluminescence; semiconductors
Web of Science Subject CategoriesMaterials Science; Materials Science, Multidisciplinary; MATERIALS SCIENCE, MULTIDISCIPLINARY; Metallurgy & Metallurgical Engineering; METALLURGY & METALLURGICAL ENGINEERING

Last updated on 2020-30-03 at 02:19