Self assembled ZnO hollow spheres and hexagonal stacking disks by metal-organic chemical-vapour deposition
Tan, S.T. Sun, X.W. Zhang, X.H. Chua, S.J. Chow, S.Y. Yong, A.M. Lo, G.Q. Kwong, D.L.
Tan, S.T.
Sun, X.W.
Zhang, X.H.
Chow, S.Y.
Yong, A.M.
Lo, G.Q.
Kwong, D.L.
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Abstract
Self-assembled ZnO hollow spheres and hexagonal stacking disks were synthesised by metal-organic chemical-vapour deposition. The growth process was investigated as a function of time and the sphere and disk structures were obtained in a narrow window of a near-zero oxygen partial pressure. The largest hollow sphere has a diameter up to 20 μm with a shell thickness of around 200 nm formed by nanocrystals or nanodisks. The hexagonal stacking disks were found to be covered with a few nanometres thick of metallic Zn observed by high-resolution transmission electron microscopy. The accumulation and dissociation of diethylzine through beta hydride elimination process in the near-zero oxygen partial pressure was thought to be the reason for the formation of the hollow spheres and stacking disks. Copyright © 2007 Inderscience Enterprises Ltd.
Keywords
Hollow spheres, MOCVD, Nanostructures, Wide-bandgap semiconductors, ZnO
Source Title
International Journal of Nanotechnology
Publisher
Series/Report No.
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Date
2007-10
DOI
10.1504/IJNT.2007.015464
Type
Article