期刊
JOURNAL OF CRYSTAL GROWTH
卷 311, 期 20, 页码 4510-4517出版社
ELSEVIER
DOI: 10.1016/j.jcrysgro.2009.08.015
关键词
Crystal morphology; Secondary growth; PVA; ZnO
资金
- Ministry of Economic Affairs, ROC [95-EC-17-A-07S1-0018]
- National Science Council, ROC [NSC96-2221-E006-119-MY3, NSC 96-2628-E-024-001-MY3]
Double-ended acicular ZnO structure can be synthesized via a hydrothermal process with tetramethylammonium hydroxide and zinc acetate as precursors and polyvinyl alcohol (PVA) as a structure-directing agent. The as-prepared ZnO products show the well crystalline wurtzite structure with growth direction along [0 0 0 1]. For the first time, PVA is found to be employed as a reservoir of Zn2+ ions in the present study, and can control the concentration of Zn2+ in reaction solution, and the acicular morphology can be formed at the two ends of the 1-D ZnO structure, due to the effect of secondary growth that occurs as the sufficient concentration of Zn2+ ions chelated by PVA releasing to the reaction solution. Furthermore, the size of the 1-D ZnO structure can be tuned by different amounts of PVA addition. (C) 2009 Elsevier B.V. All rights reserved.
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