Temperature-dependent growth mechanisms of low-dimensional ZnO nanostructures

Cheng, Qijin & Ostrikov, Kostya (2011) Temperature-dependent growth mechanisms of low-dimensional ZnO nanostructures. CrystEngComm, 13(10), pp. 3455-3461.

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Abstract

One-dimensional ZnO nanostructures were successfully synthesized on single-crystal silicon substrates via a simple thermal evaporation and vapour-phase transport method under different process temperatures from 500 to 1000 °C. The detailed and in-depth analysis of the experimental results shows that the growth of ZnO nanostructures at process temperatures of 500, 800, and 1000 °C is governed by different growth mechanisms. At a low process temperature of 500 °C, the ZnO nanostructures feature flat and smooth tips, and their growth is primarily governed by the vapour-solid mechanism. At an intermediate process temperature of 800 °C, the ZnO nanostructures feature cone-shape tips, and their growth is primarily governed by the self-catalyzed and saturated vapour–liquid–solid mechanism. At a high process temperature of 1000 °C, the alloy tip appears on the front side of the ZnO nanostructures, and their growth is primarily governed by the common catalyst-assisted vapour–liquid–solid mechanism. It is also shown that the morphological, structural, optical, and compositional properties of the synthesized ZnO nanostructures are closely related to the process temperature. These results are highly relevant to the development of light-emitting diodes, chemical sensors, energy conversion devices, and other advanced applications.

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ID Code: 73755
Item Type: Journal Article
Refereed: Yes
DOI: 10.1039/c0ce00972e
ISSN: 1466-8033
Divisions: Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2011 Royal Society of Chemistry
Deposited On: 10 Jul 2014 05:10
Last Modified: 11 Jul 2014 03:12

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