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Characterization of ZnO Nanostructures Grown by Pulsed Laser Deposition

Published online by Cambridge University Press:  31 January 2011

Christian Weigand ,
Matthew R Bergren ,
Cecile Ladam ,
Per Erik Vullum ,
John C Walmsley ,
Ragnar Fagerberg ,
Tom E Furtak ,
Reuben Collins ,
Jostein Grepstad  and
Helge Weman
Christian Weigand
Affiliation:
[email protected], Norwegian University of Science and Technology, Electronics and Telecommunications, Trondheim, Norway
Matthew R Bergren
Affiliation:
[email protected], Colorado School of Mines, Deparment of Physics, Golden, Colorado, United States
Cecile Ladam
Affiliation:
[email protected], SINTEF, Materials and Chemistry, Trondheim, Norway
Per Erik Vullum
Affiliation:
[email protected], SINTEF, Materials and Chemistry, Trondheim, Norway
John C Walmsley
Affiliation:
[email protected], SINTEF, Materials and Chemistry, Trondheim, Norway
Ragnar Fagerberg
Affiliation:
[email protected], SINTEF, Materials and Chemistry, Trondheim, Norway
Tom E Furtak
Affiliation:
[email protected], Colorado School of Mines, Department of Physics, Golden, Colorado, United States
Reuben Collins
Affiliation:
[email protected], Colorado School of Mines, Department of Physics, Golden, Colorado, United States
Jostein Grepstad
Affiliation:
[email protected], Norwegian University of Science and Technology, Electronics and Telecommunications, Trondheim, Norway
Helge Weman
Affiliation:
[email protected], Norwegian University of Science and Technology, Electronics and Telecommunications, Trondheim, Norway
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Abstract

ZnO nanostructures were grown by pulsed laser deposition on c-plane sapphire substrates. The as-grown nanostructures were examined by scanning electron microscopy and transmission electron microscopy ZnO nanowires were grown using a gold catalyst, at a high substrate temperature of 800°C and an ambient gas pressure of 0.5 mbar (5% oxygen, 95% argon). Changing the gas composition to pure oxygen led to the growth of stacking fault-free ZnO nanosheets with their growth direction inclined to the [0001] direction. Similar nanosheets with stacking faults were found when lowering the growth temperature to 600°C for a 5% oxygen – 95% argon ambient gas composition and the same overall pressure. A growth mechanism for these ZnO nanosheets is proposed.

Keywords

laser ablationnanostructurenucleation & growth
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1174: Symposium V – Functional Metal-Oxide Nanostructures , 2009 , 1174-V07-09
Copyright
Copyright © Materials Research Society 2009

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