A positron annihilation spectroscopic investigation of europium-doped cerium oxide nanoparticles

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dc.contributor.author Thorat, Atul V.
dc.contributor.author Ghoshal, Tandra
dc.contributor.author Holmes, Justin D.
dc.contributor.author Nambissan, P. M. G.
dc.contributor.author Morris, Michael A.
dc.date.accessioned 2018-09-14T09:19:25Z
dc.date.available 2018-09-14T09:19:25Z
dc.date.issued 2013-10-28
dc.identifier.citation Thorat, A. V., Ghoshal, T., Holmes, J. D., Nambissan, P. M. G. and Morris, M. A. (2014) 'A positron annihilation spectroscopic investigation of europium-doped cerium oxide nanoparticles', Nanoscale, 6(1), pp. 608-615. doi: 10.1039/c3nr03936f en
dc.identifier.volume 14 en
dc.identifier.issued 1 en
dc.identifier.startpage 608 en
dc.identifier.endpage 615 en
dc.identifier.issn 2040-3364
dc.identifier.uri http://hdl.handle.net/10468/6785
dc.identifier.doi 10.1039/c3nr03936f
dc.description.abstract Doping in ceria (CeO2) nanoparticles with europium (Eu) of varying concentrations (0, 0.1, 0.5, …, 50 atom%) is studied using complementary experimental techniques and novel observations were made during the investigation. The immediate observable effect was a distinct reduction in particle sizes with increasing Eu concentration attributed to the relaxation of strain introduced due to the replacement of Ce4+ ions by Eu3+ ions of larger radius. However, this general trend was reversed in the doping concentration range of 0.1–1 atom% due to the reduction of Ce4+ to Ce3+ and the formation of anion vacancies. Quantum confinement effects became evident with the increase of band gap energy when the particle sizes reduced below 7–8 nm. Positron annihilation studies indicated the presence of vacancy type defects in the form of vacancy clusters within the nanoparticles. Some positron annihilation was also seen on the surface of crystallites as a result of diffusion of thermalized positrons before annihilation. Coincidence Doppler broadening measurements indicated the annihilation of positrons with electrons of different species of atoms and the characteristic S–W plot showed a kink-like feature at the particle sizes where quantum confinement effects began. en
dc.description.sponsorship Science Foundation Ireland (Strategic Research Cluster FORME grant, 09/SIRG/I1621 grant and the CSET CRANN grant) en
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher Royal Society of Chemistry (RSC) en
dc.relation.uri http://pubs.rsc.org/en/Content/ArticleLanding/2014/NR/C3NR03936F
dc.rights © Royal Society of Chemistry 2014 en
dc.subject Electrons en
dc.subject Atoms en
dc.subject Cerium compounds en
dc.subject Europium en
dc.subject Ions en
dc.subject Nanoparticles en
dc.subject Particle size en
dc.subject Positrons en
dc.subject Quantum confinement en
dc.subject Vacancies en
dc.title A positron annihilation spectroscopic investigation of europium-doped cerium oxide nanoparticles en
dc.type Article (peer-reviewed) en
dc.internal.authorcontactother Justin D. Holmes, Chemistry, University College Cork, Cork, Ireland. +353-21-490-3000 Email: j.holmes@ucc.ie en
dc.internal.availability Full text available en
dc.date.updated 2018-08-07T14:35:44Z
dc.description.version Accepted Version en
dc.internal.rssid 241504244
dc.contributor.funder Science Foundation Ireland en
dc.description.status Peer reviewed en
dc.identifier.journaltitle Nanoscale en
dc.internal.copyrightchecked No !!CORA!! en
dc.internal.licenseacceptance Yes en
dc.internal.IRISemailaddress j.holmes@ucc.ie en
dc.relation.project info:eu-repo/grantAgreement/SFI/SFI Starting Investigator Research Grant (SIRG)/09/SIRG/I1621/IE/Tuning surface and dopant properties of silicon and germanium nanowires for high performance nanowire-based field-effect transistors/ en

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