Table of Contents
ISRN Nanotechnology
Volume 2011, Article ID 823216, 5 pages
http://dx.doi.org/10.5402/2011/823216
Research Article

Controlled Synthesis of Hollow Hemispheric ZnO Shells/Cages on Graphite Fiber

1School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798
2School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798
3School of Electrical and Electronic Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798

Received 28 February 2011; Accepted 30 March 2011

Academic Editor: I.-C. Chen

Copyright © 2011 Xianbin Liu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Hollow hemispheric ZnO shells/cages are synthesized on graphite fiber via simple thermal evaporation process. The cage-like ZnO structures exhibit micron or submicron size and hollow hemispheric shape with polycrystalline shell made of the ZnO nanocrystals. Controlled time-sequenced growth experiment is conducted to interpret the growth process, which indicates that the growth mechanism of the hollow hemispheric ZnO shells/cages involves formation of Zn particles firstly, followed by oxidation of the outer surface of Zn droplets and meantime sublimation of the core Zn.