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Catalyst-free synthesis and cathodoluminescent properties of ZnO nanobranches on Si nanowire backbones

Published online by Cambridge University Press:  31 January 2011

Kwang-Soo Son ,
Dong Hyun Lee ,
Jae-Woong Choung ,
Yong Bum Pyun ,
Won Il Park ,
Taeseup Song  and
Ungyu Paik
Kwang-Soo Son
Affiliation:
Division of Materials Science and Engineering, Hanyang University, Seoul 133-791, Korea
Dong Hyun Lee
Affiliation:
Division of Materials Science and Engineering, Hanyang University, Seoul 133-791, Korea
Jae-Woong Choung
Affiliation:
Division of Materials Science and Engineering, Hanyang University, Seoul 133-791, Korea
Yong Bum Pyun
Affiliation:
Division of Materials Science and Engineering, Hanyang University, Seoul 133-791, Korea
Won Il Park*
Affiliation:
Division of Materials Science and Engineering, Hanyang University, Seoul 133-791, Korea
Taeseup Song
Affiliation:
Division of Materials Science and Engineering, Hanyang University, Seoul 133-791, Korea
Ungyu Paik
Affiliation:
Division of Materials Science and Engineering, Hanyang University, Seoul 133-791, Korea
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

We report the catalyst-free synthesis of ZnO nanobranches on Si nanowires using metalorganic chemical vapor deposition. The formation of single-crystalline ZnO nanobranches on Si nanowire backbones has been confirmed by lattice resolved transmission electron microscopy. Depending on the growth parameters, especially the growth temperature, the morphology and size of the ZnO nanobranches evolved from nanothorn-shaped (at 350 °C) to nanoneedle-shaped structures (at 500 °C). When the growth temperature was further increased to 800 °C, thin ZnO nanowire branches grew out of the Si nanowire backbones coated with thin ZnO shells, whereas no ZnO branch was formed on bare Si nanowires due to limited nucleation. The growth behavior was further exploited to fabricate ZnO/Si nanowire networks by growing the ZnO nanowires selectively on laterally aligned Si–ZnO core-shell nanowire arrays. In addition, cathodoluminescent properties of ZnO nanobranches on Si nanowire backbones are discussed with respect to position and size.

Keywords

Chemical vapor deposition (CVD) (deposition)Nanostructure
Type
Articles
Information
Journal of Materials Research , Volume 23 , Issue 12: Biomimetic and Bio-enabled Materials Science and Engineering , December 2008 , pp. 3403 - 3408
Copyright
Copyright © Materials Research Society 2008

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