Journal
CERAMICS INTERNATIONAL
Volume 39, Issue 7, Pages 8287-8291Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2013.03.098
Keywords
ZnO; Microstructures; Hydrothermal synthesis; Photoluminescence
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Funding
- Chonbuk National University
- Ministry of Education and Human-Resource Development
- National Research Foundation (NRF)
- Korea government (MEST) [NRF- 2010-0019626, 2010-0023363]
- National Research Foundation of Korea [2010-0023363] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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ZnO microstructures were synthesized by the hydrothermal method. Scanning electron microscopy (SEM) revealed the formation of ZnO microrods in absence of trisodium citrate and hexagon-shaped ZnO microdisks in presence of trisodium citrate. The length and width of ZnO microrods were 3-5 mu m and 500 nm-1 mu m, respectively and they were tapered at both ends, whereas ZnO microdisks were 1-2 mu m in diameter. Crystal growth mechanism suggested that citrate suppressed the growth of ZnO along c-axis which resulted into the formation of microdisks like structure. Photoluminescence (PL) spectroscopy showed a weak ultraviolet (UV) and strong green emission in ZnO microrods but a strong UV and very weak green emission in ZnO microdisks. It was suggested that the green emission in ZnO microrods was due to structural defects present at polar planes which was reduced in microdisks with reduction in polar planes. (C) 2013 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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