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Synthesis and Characterization of Flowerlike ZnO Nanoneedle Arrays on Si (100)

Published online by Cambridge University Press:  31 January 2011

Boqian Yang
Affiliation:
[email protected], University of Puerto Rico, Physics Department, San Juan, Puerto Rico
Xianping Feng
Affiliation:
[email protected], University of Puerto Rico, Physics Department, San Juan, Puerto Rico
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Abstract

Flowerlike ZnO nanoneedle arrays have been synthesized on Si (100) substrates by pulsed laser deposition techniques. The tips of the nanoneedles are ˜ 20- 50 nm in diameter and their roots are as thick as ˜ 50- 100 nm. The nanoneedle arrays grow preferentially along the [0001] direction. Raman spectroscopy shows three first order optical normal modes which confirm wurtzite structure of ZnO nanoneedles. In the low frequency zone, additive modes (92, 122, 163, and 275 cm-1) are observed and can be attributed to zone boundary phonons. ZnO nanoneedle arrays exhibit a strong UV luminescence emission, and two strong peaks at 3.258 eV and 3.288 eV are observed.

Type
Research Article
Copyright
Copyright © Materials Research Society 2009

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