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Growth of 18O isotopically-enriched ZnO nanorods by two novel VPT methods

Gray, Ciarán, Trefflich, Lukas, Röder, Robert, Ronning, Carsten, Henry, Martin O. and McGlynn, Enda orcid logoORCID: 0000-0002-3412-9035 (2017) Growth of 18O isotopically-enriched ZnO nanorods by two novel VPT methods. Journal of Crystal Growth, 460 . pp. 85-93. ISSN 0022-0248

Abstract
We have developed two novel vapour phase transport methods to grow ZnO nanorod arrays isotopically enriched with 18O. Firstly, a three-step process used to grow natural and Zn-enriched ZnO nanorods has been further modified, by replacing the atmospheric O2 with enriched 18O2, in order to grow 18O-enriched ZnO nanorods using this vapour-solid method on chemical bath deposited buffer layers. In addition, 18O-enriched ZnO nanorods were successfully grown using 18O isotopically enriched ZnO source powders in a vapour-liquid-solid growth method. Scanning electron microscopy studies confirmed the success of both growth methods in terms of nanorod morphology, although in the case of the vapour-liquid-solid samples, the nanorods’ c-axes were not vertically aligned due to the use of a non-epitaxial substrate. Raman and PL studies indicated clearly that O-enrichment was successful in both cases, although the results indicate that the enrichment is at a lower level in our samples compared to previous reports with the same nominal enrichment levels. The results of our studies also allow us to comment on both levels of enrichment achieved and on novel effects of the high temperature growth environment on the nanorod growth, as well as suggesting possible mechanisms for such effects. Very narrow photoluminescence line widths, far narrower than those reported previously in the literature for isotopically enriched bulk ZnO, are seen in both the vapour-solid and vapour-liquid-solid nanorod samples demonstrating their excellent optical quality and their potential for use in detailed optical studies of defects and impurities using low temperature photoluminescence.
Metadata
Item Type:Article (Published)
Refereed:Yes
Uncontrolled Keywords:ZnO, nanorods, isotopic, enrichment
Subjects:Engineering > Materials
Physical Sciences > Spectrum analysis
Physical Sciences > Nanotechnology
Physical Sciences > Semiconductors
Physical Sciences > Crystallography
DCU Faculties and Centres:Research Initiatives and Centres > National Centre for Plasma Science and Technology (NCPST)
DCU Faculties and Schools > Faculty of Science and Health > School of Physical Sciences
Publisher:Elsevier
Official URL:http://dx.doi.org/10.1016/j.jcrysgro.2016.12.069
Copyright Information:© 2017 Elsevier B.V.
ID Code:21651
Deposited On:20 Jan 2017 13:41 by Enda Mcglynn . Last Modified 19 Mar 2019 14:19
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