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

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dc.contributor.authorThorat, Atul V.
dc.contributor.authorGhoshal, Tandra
dc.contributor.authorHolmes, Justin D.
dc.contributor.authorNambissan, P. M. G.
dc.contributor.authorMorris, Michael A.
dc.contributor.funderScience Foundation Irelanden
dc.date.accessioned2018-09-14T09:19:25Z
dc.date.available2018-09-14T09:19:25Z
dc.date.issued2013-10-28
dc.date.updated2018-08-07T14:35:44Z
dc.description.abstractDoping in ceria (CeO2) nanoparticles with europium (Eu) of varying concentrations (0, 0.1, 0.5, ā€¦, 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 0.1ā€“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 7ā€“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 Sā€“W plot showed a kink-like feature at the particle sizes where quantum confinement effects began.en
dc.description.sponsorshipScience Foundation Ireland (Strategic Research Cluster FORME grant, 09/SIRG/I1621 grant and the CSET CRANN grant)en
dc.description.statusPeer revieweden
dc.description.versionAccepted Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.citationThorat, 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/c3nr03936fen
dc.identifier.doi10.1039/c3nr03936f
dc.identifier.endpage615en
dc.identifier.issn2040-3364
dc.identifier.issued1en
dc.identifier.journaltitleNanoscaleen
dc.identifier.startpage608en
dc.identifier.urihttps://hdl.handle.net/10468/6785
dc.identifier.volume14en
dc.language.isoenen
dc.publisherRoyal Society of Chemistry (RSC)en
dc.relation.projectinfo: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
dc.relation.urihttp://pubs.rsc.org/en/Content/ArticleLanding/2014/NR/C3NR03936F
dc.rightsĀ© Royal Society of Chemistry 2014en
dc.subjectElectronsen
dc.subjectAtomsen
dc.subjectCerium compoundsen
dc.subjectEuropiumen
dc.subjectIonsen
dc.subjectNanoparticlesen
dc.subjectParticle sizeen
dc.subjectPositronsen
dc.subjectQuantum confinementen
dc.subjectVacanciesen
dc.titleA positron annihilation spectroscopic investigation of europium-doped cerium oxide nanoparticlesen
dc.typeArticle (peer-reviewed)en
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