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Structural and optical properties of Zn0.9Mn0.1O/ZnO core-shell nanowires designed by pulsed laser deposition

J. Appl. Phys. 106, 093501 (2009); doi:10.1063/1.3253572

Published 3 November 2009

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V. E. Kaydashev,1 E. M. Kaidashev,1 M. Peres,2 T. Monteiro,2 M. R. Correia,2 N. A. Sobolev,2 L. C. Alves,3 N. Franco,3 and E. Alves3
1Southern Federal University, 344090 Rostov-on-Don, Russia
2Departamento de Física and I3N, Universidade de Aveiro, 3810-193 Aveiro, Portugal
3Instituto Tecnológico e Nuclear, 2686-953 Sacavém, Portugal
Core-shell ZnO/ZnMnO nanowires on a-Al2O3 and GaN (buffer layer)/Si (111) substrates were fabricated by pulsed laser deposition using a Au catalyst. Two ZnO targets with a Mn content of 10% were sintered at 1150 and 550 °C in order to achieve the domination in them of paramagnetic MnO2 and ferromagnetic Mn2O3 phases, respectively. Cluster mechanism of laser ablation as a source of possible incorporation of secondary phases to the wire shell is discussed. Raman spectroscopy under excitation by an Ar+ laser revealed a broad peak related to the Mn-induced disorder and a redshift in the A1-LO phonon. Resonant Raman measurements revealed an increase in the multiphonon scattering caused by disorder in ZnO upon doping by Mn. Besides the UV emission, a vibronic green emission band assisted by a ~71  meV LO phonon is also observed in the photoluminescence spectra. Core-shell structures with smooth shells show a high exciton to green band intensity ratio (~10) even at room temperature. ©2009 American Institute of Physics
History: Received 19 August 2009; accepted 1 September 2009; published 3 November 2009
Permalink: http://link.aip.org/link/?JAPIAU/106/093501/1
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KEYWORDS and PACS

Keywords
PACS
  • 81.16.Mk
    Laser-assisted deposition in nanofabrication and processing
  • 78.67.Lt
    Optical properties of quantum wires
  • 75.20.Ck
    Diamagnetism and paramagnetism in nonmetals
  • 75.30.Kz
    Magnetic phase boundaries
  • 75.50.Dd
    Nonmetallic ferromagnetic materials
  • 82.65.+r
    Surface and interface chemistry; heterogeneous catalysis at surfaces
  • YEAR: 2009

PUBLICATION DATA

ISSN:
0021-8979 (print)   1089-7550 (online)
Publisher:
AIP is a member of CrossRef AIP

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