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Control of morphology and orientation of electrochemically grown ZnO nanorods |
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| Authors: | Tran Hoang Cao Son Le Khac Top Nguyen Thi Dong Tri Ha Thuc Chi Nhan Lam Quang Vinh Bach Thang Phan Sang Sub Kim Le Van Hieu |
| Affiliation: | 1. Faculty of Materials Science, University of Science, Vietnam National University, Ho Chi Minh City, Vietnam 2. Faculty of Physics and Engineering Physics, University of Science, Vietnam National University, Ho Chi Minh City, Vietnam 3. Vietnam National University, Laboratory of Advanced Materials, University of Science, Ho Chi Minh City, Vietnam 4. Department of Materials Science and Engineering, Inha University, Incheon, Korea |
| Abstract: | We report the direct electrochemical deposition of ZnO nanorods on an indium tin oxide substrate. The morphology and orientation of the grown ZnO nanorods were investigated as functions of the current density. It is likely that the concentrations of OH? and Zn2+ ions, which could be controlled by varying the current density, determine the shape and alignment of the ZnO nanorods. The nanorods were tilted, hexagonal, and prismatic at a low current density (0.1 mA/cm2) and vertically aligned and obelisk-shaped at high current densities (greater than 0.6 mA/cm2). By using the low and high current densities sequentially in a two-step growth process, vertically aligned, hexagonal, and prismatic ZnO nanorods could be grown successfully. The underlying mechanism responsible for the growth of the ZnO nanorods is also discussed. |
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