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Crystalline ZnO/amorphous ZnO core/shell nanorods: self-organized growth, structure, and novel luminescence

Inguva, Saikumar, Marka, S.K., Vijayaraghavan, Rajani K. orcid logoORCID: 0000-0003-1096-448X, McGlynn, Enda orcid logoORCID: 0000-0002-3412-9035, Srikanth, V.V.S.S. and Mosnier, Jean-Paul orcid logoORCID: 0000-0002-9312-1754 (2015) Crystalline ZnO/amorphous ZnO core/shell nanorods: self-organized growth, structure, and novel luminescence. Journal of Physical Chemistry C, 119 (9). pp. 4848-4855. ISSN 1932-7455

We have used pulsed-laser deposition, following a specific sequence of heating and cooling phases, to grow ZnO nanorods on ZnO buffer/Si (100) substrates, in a 600 mT oxygen ambient, without catalyst. In these conditions, the nanorods preferentially self-organize in the form of vertically aligned, core/shell structures. X-ray diffraction analyses, obtained from 2θ-ω and pole figure scans, shows a crystalline (wurtzite) ZnO deposit with uniform c-axis orientation normal to the substrate. Field emission SEM, TEM, HR-TEM and selective area electron diffraction (SAED) studies revealed that the nanorods have a crystalline core and an amorphous shell. The low-temperature (13 K) photoluminescence featured a strong I6 (3.36 eV) line emission, structured green band emission and a hitherto unreported broad emission at 3.331 eV. Further studies on the 3.331 eV band showed the involvement of deeply-bound excitonic constituents in a single electron-hole recombination. The body of structural data suggests that the 3.331 eV emission can be linked to the range of defects associated with the unique crystalline ZnO/amorphous ZnO core/shell structure of the nanorods. The relevance of the work is discussed in the context of the current production methods of core/shell nanorods and their domains of application.
Item Type:Article (Published)
Uncontrolled Keywords:ZnO; Nanorod; Core-shell
Subjects:Engineering > Materials
Physical Sciences > Spectrum analysis
Physical Sciences > Nanotechnology
Physical Sciences > Semiconductors
DCU Faculties and Centres:Research Institutes and Centres > National Centre for Plasma Science and Technology (NCPST)
DCU Faculties and Schools > Faculty of Science and Health > School of Physical Sciences
Publisher:American Chemical Society
Official URL:http://dx.doi.org/10.1021/jp511783c
Copyright Information:This document is the Accepted Manuscript version of a Published Work that appeared in final form in Journal of Physical Chemistry C, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see http://dx.doi.org/10.1021/jp511783c
Use License:This item is licensed under a Creative Commons Attribution-NonCommercial-Share Alike 3.0 License. View License
ID Code:20537
Deposited On:09 Apr 2015 10:12 by Enda Mcglynn . Last Modified 07 Oct 2021 12:16

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