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Cho, Seungho
Metal Oxide DEsign Laboratory (MODEL)
Research Interests
  • Metal Oxide Crystal Growth

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Formation of Amorphous Zinc Citrate Spheres and Their Conversion to Crystalline ZnO Nanostructures

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Title
Formation of Amorphous Zinc Citrate Spheres and Their Conversion to Crystalline ZnO Nanostructures
Other Titles
Formation of Amorphous Zinc Citrate Spheres and Their Conversion to Crystalline ZnO Nanostructures
Author
Cho, SeunghoJang, Ji-WookJung, AlumLee, Sung-HyunLee, JaeguenLee, Jae SungLee, Kun-Hong
Issue Date
2011-01
Publisher
AMER CHEMICAL SOC
Citation
LANGMUIR, v.27, no.1, pp.371 - 378
Abstract
We report a method for synthesizing zinc citrate spheres at a low temperature (90 degrees C) under normal atmospheric pressure. The spherical structures were amorphous and had an average diameter of similar to 1.7 mu m. The amorphous zinc citrate spheres could be converted into crystalline ZnO nanostructures in aqueous solutions by heating at 90 degrees C for 1 h. By local dissolution of the zinc citrate spheres, nucleation and growth of ZnO occurred on the surfaces of the amorphous zinc citrate spheres. The morphologies and exposed crystal faces of the crystalline ZnO nanostructures (structure I: oblate spheroid; structure II: prolate spheroid; structure III: hexagonal disk; structure IV: sphere) could be controlled simply by varying the solution composition (solutions I, II, III, or IV) in which the as-prepared amorphous zinc citrate spheres were converted. The concentration of citrate anions and solution pH played a decisive role in determining the morphologies and exposed crystal faces of the crystalline ZnO nanostructures. On the basis of experimental results, we propose a plausible mechanism for the conversion of amorphous zinc citrate spheres into the variety of observed ZnO structures
URI
https://scholarworks.unist.ac.kr/handle/201301/12836
URL
http://pubs.acs.org/doi/abs/10.1021/la103600c
DOI
10.1021/la103600c
ISSN
0743-7463
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