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Core-defect reduction in ZnO nanorods by cobalt incorporation
Aix Marseille University, France.
Linköping University, Department of Science and Technology. Linköping University, Faculty of Science & Engineering.
Aix Marseille University, France.
Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, Faculty of Science & Engineering.
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2017 (English)In: Nanotechnology, ISSN 0957-4484, E-ISSN 1361-6528, Vol. 28, no 28, 285705Article in journal (Refereed) Published
Abstract [en]

Zinc oxide (ZnO) nanorods grown by the low-temperature (90 degrees C) aqueous chemical method with different cobalt concentration within the synthesis solution (from 0% to 15%), are studied by electron paramagnetic resonance (EPR), just above the liquid helium temperature. The anisotropic spectra of substitutional Co2+ reveal a high crystalline quality and orientation of the NRs, as well as the probable presence of a secondary disordered phase of ZnO: Co. The analysis of the EPR spectra indicates that the disappearance of the paramagnetic native core-defect (CD) at g similar to 1.96 is correlated with the apparition of the Co2+ ions lines, suggesting a gradual neutralization of the former by the latter. We show that only a little amount of cobalt in the synthesis solution (about 0.2%) is necessary to suppress almost all these paramagnetic CDs. This gives insight in the experimentally observed improvement of the crystal quality of diluted ZnO: Co nanorods, as well as into the control of paramagnetic defects in ZnO nanostructures.

Place, publisher, year, edition, pages
IOP PUBLISHING LTD , 2017. Vol. 28, no 28, 285705
Keyword [en]
nanorods; ZnO; physics defects; electron paramagnetic resonance
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:liu:diva-139388DOI: 10.1088/1361-6528/aa716aISI: 000404344400005PubMedID: 28475103OAI: oai:DiVA.org:liu-139388DiVA: diva2:1129842
Note

Funding Agencies|NATO project Science for Peace (SfP), Novel nanostructures [984735]

Available from: 2017-08-07 Created: 2017-08-07 Last updated: 2017-08-29

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The full text will be freely available from 2018-06-23 15:36
Available from 2018-06-23 15:36

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