Growth characteristics of ultra long double-ended acicular ZnO synthesized by a hydrothermal process |
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| Authors: | S.K. Tzeng M.H. Hon I.C. Leu |
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| Affiliation: | 1. Department of Materials Science and Engineering, National Cheng Kung University, Tainan 701, Taiwan, ROC;2. Department of Materials Science, National University of Tainan, Tainan 700, Taiwan, ROC |
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| Abstract: | 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. |
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| Keywords: | A1. Crystal morphology A1. Secondary growth B1. PVA B2. ZnO |
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