Optical response of Ag-Au bimetallic nanoparticles to electron storage in aqueous medium

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buir.contributor.authorSüzer, Şefik
dc.citation.epage3007en_US
dc.citation.issueNumber6en_US
dc.citation.spage3003en_US
dc.citation.volumeNumber8en_US
dc.contributor.authorTunc, I.en_US
dc.contributor.authorGuvenc, H. O.en_US
dc.contributor.authorSezen, H.en_US
dc.contributor.authorSüzer, Şefiken_US
dc.contributor.authorCorrea-Duarte, M. A.en_US
dc.contributor.authorLiz-Marzán, L. M.en_US
dc.date.accessioned2016-02-08T10:08:58Z
dc.date.available2016-02-08T10:08:58Z
dc.date.issued2008en_US
dc.departmentDepartment of Chemistryen_US
dc.description.abstractComposition and structure dependence of the shift in the position of the surface plasmon resonance band upon introduction of NaBH 4 to aqueous solutions of gold and silver nanoparticles are presented. Silver and gold nanoalloys in different compositions were prepared by co-reduction of the corresponding salt mixtures using sodium citrate as the reducing agent. After addition of NaBH 4 to the resultant nanoalloys, the maximum of their surface plasmon resonance band, ranging between that of pure silver (ca. 400 nm) and of pure gold (ca. 530 nm), is blue-shifted as a result of electron storage on the particles. The extent of this blue shift increases non-linearly with the mole fraction of silver in the nanoparticle, parallel to the trends reported previously for both the frequency and the extinction coefficient of the plasmon band shifts. Gold(core)@silver(shell) nanoparticles were prepared by sequential reduction of gold and silver, where addition of NaBH 4 results in relatively large spectral shift in the plasmon resonance band when compared with the nanoalloys having a similar overall composition. The origin of the large plasmon band shift in the core-shell is related with a higher silver surface concentration on these particles. Hence, the chemical nature of the nanoparticle emerges as the dominating factor contributing to the extent of the spectral shift as a result of electron storage in bimetallic systems. Copyright © 2008 American Scientific Publishers All rights reserved.en_US
dc.description.provenanceMade available in DSpace on 2016-02-08T10:08:58Z (GMT). No. of bitstreams: 1 bilkent-research-paper.pdf: 70227 bytes, checksum: 26e812c6f5156f83f0e77b261a471b5a (MD5) Previous issue date: 2008en
dc.identifier.doi10.1166/jnn.2008.157en_US
dc.identifier.issn1533-4880
dc.identifier.urihttp://hdl.handle.net/11693/23104
dc.language.isoEnglishen_US
dc.relation.isversionofhttp://dx.doi.org/10.1166/jnn.2008.157en_US
dc.source.titleJournal of Nanoscience and Nanotechnologyen_US
dc.subjectCore-shell structureen_US
dc.subjectGold and silver nanoparticlesen_US
dc.subjectSpectral shiftsen_US
dc.subjectAqueous mediumen_US
dc.subjectBi-metallic nanoparticlesen_US
dc.subjectCharge storageen_US
dc.subjectElectron storageen_US
dc.subjectOptical responsesen_US
dc.subjectStructure dependenceen_US
dc.subjectGolden_US
dc.subjectSurface plasmon resonanceen_US
dc.subjectSilveren_US
dc.titleOptical response of Ag-Au bimetallic nanoparticles to electron storage in aqueous mediumen_US
dc.typeArticleen_US

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