期刊
APPLIED SURFACE SCIENCE
卷 264, 期 -, 页码 162-170出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2012.09.164
关键词
Growth mechanism; Flower-like ZnO; ZnO nanorod arrays; Zinc substrate; Hydrothermal synthesis
类别
资金
- Program for Taishan Scholars of Shandong Province Government
- National Natural Science Foundation of China [21071061]
- Natural Science Foundation of Shandong Province [ZR2010EZ001, ZR2009FM072]
- Science and Technology Projects of Colleges and Universities of Shandong Province [J12LA06]
Flower-like ZnO with various morphologies on ZnO nanorod arrays have been hydrothermally fabricated using zinc substrates at low temperature (70 degrees C). The time-dependent experiments indicated that both dense ZnO nanorod arrays and flower-like ZnO were created when the reaction time is 30 min. A growth mechanism was proposed to account for the growth of the flower-like ZnO on ZnO nanorod arrays. In situ growth caused the generation of dense ZnO nanorod arrays that were almost perpendicular to the surface of a zinc substrate. Due to the different rate of nucleation and crystal growth the morphology of flower-like ZnO on the top of ZnO nanorod arrays varied with the concentration of OH-. The ionic radius of alkali metal hydroxide used to generate Zn(OH)(4)(2-) ions greatly affected the morphology of ZnO. Owing to the small quantity of ZnO nuclei and Zn(OH)(4)(2-) the flower-like ZnO on ZnO nanorod arrays became fewer when lowering the concentration of Zn2+ and OH- while keeping the ratio between them. (c) 2012 Elsevier B.V. All rights reserved.
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