We thank the NSF (grant DMI 0403671), the NASA Vehicle Systems Program, the Department of Defense Research and Engineering (DDR&E), and the Defense Advanced Research Projects Agency (Award No. N66001-04-1-8903) for their support.
Metal/Semiconductor Core/Shell Nanodisks and Nanotubes†
Article first published online: 21 NOV 2005
Copyright © 2006 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Advanced Functional Materials
Volume 16, Issue 1, pages 53–62, January, 2006
How to Cite
Gao, P. X., Lao, C. S., Ding, Y. and Wang, Z. L. (2006), Metal/Semiconductor Core/Shell Nanodisks and Nanotubes. Adv. Funct. Mater., 16: 53–62. doi: 10.1002/adfm.200500301
- Issue published online: 27 DEC 2005
- Article first published online: 21 NOV 2005
- Manuscript Received: 16 MAY 2005
- Core/shell particles;
- Nanostructures, composite;
- Nanotubes, composite;
- Zinc oxide
The low melting point of Zn and the high melting point of ZnO, as well as their hexagonal crystal structures, present great advantages for designing and fabricating various metal/semiconductor core/shell nanostructures. By controlling the kinetics in the Zn and ZnO system, the lower-energy facets, and the oxidation rates of different surfaces, we can control the fabrication of Zn/ZnO core/shell single-crystal, polycrystalline, and mesoporous nanodisks, as well as a variety of ZnO nanotubes. The oxidation of a Zn nano-object leads to the formation of Zn/ZnO core/shell nanodisks. A lower oxidation temperature results in the formation of a single-crystal-like Zn/ZnO core/shell structure, while a higher oxidation temperature leads to the formation of textured and even polycrystalline nanostructures. A re-sublimation process of Zn in the core leaves a ZnO shell structure. This is an approach for synthesizing metal/semiconductor core/shell or composite nanostructures. This article offers a detailed description of the kinetics controlling the procedures, the nanostructures obtained, their morphological and crystal structures, and their formation mechanisms.