Open Access Nano Perspectives

The Periodic Instability of Diameter of ZnO Nanowires via a Self-oscillatory Mechanism

Ye Zhang*, Youguo Yan and Feng Zhu

Author Affiliations

Key Laboratory of Materials Physics, Institute of Solid State Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, 230031, P.R. China

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Nanoscale Research Letters 2007, 2:492-495  doi:10.1007/s11671-007-9094-0

Published: 13 September 2007

Abstract

ZnO nanowires with a periodic instability of diameter were successfully prepared by a thermal physical vapor deposition method. The morphology of ZnO nanowires was investigated by SEM. SEM shows ZnO possess periodic bead-like structure. The instability only appears when the diameter of ZnO nanowires is small. The kinetics and mechanism of Instability was discussed at length. The appearance of the instability is due to negative feed-back mechanism under certain experimental conditions (crystallization temperature, vapor supersaturation, etc).

Keywords:
ZnO nanowire; Negative feed-back mechanism; Growth mechanism; Physical vapor deposition