Self assembled ZnO hollow spheres and hexagonal stacking disks by metal-organic chemical-vapour deposition
by S.T. Tan, X.W. Sun, X.H. Zhang, S.J. Chua, S.Y. Chow, A.M. Yong, G.Q. Lo, D.L. Kwong
International Journal of Nanotechnology (IJNT), Vol. 4, No. 6, 2007

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 diethylzinc 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.

Online publication date: Thu, 18-Oct-2007

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