Fabricating a Homogeneously Alloyed AuAg Shell on Au Nanorods to Achieve Strong, Stable, and Tunable Surface Plasmon Resonances

Handle URI:
http://hdl.handle.net/10754/574950
Title:
Fabricating a Homogeneously Alloyed AuAg Shell on Au Nanorods to Achieve Strong, Stable, and Tunable Surface Plasmon Resonances
Authors:
Huang, Jianfeng ( 0000-0002-2359-6658 ) ; Zhu, Yihan; Liu, Changxu ( 0000-0003-1196-7447 ) ; Zhao, Yunfeng; Liu, Zhaohui; Hedhili, Mohamed N. ( 0000-0002-3624-036X ) ; Fratalocchi, Andrea ( 0000-0001-6769-4439 ) ; Han, Yu ( 0000-0003-1462-1118 )
Abstract:
Colloidal metal nanocrystals with strong, stable, and tunable localized surface plasmon resonances (SPRs) can be useful in a corrosive environment for many applications including field-enhanced spectroscopies, plasmon-mediated catalysis, etc. Here, a new synthetic strategy is reported that enables the epitaxial growth of a homogeneously alloyed AuAg shell on Au nanorod seeds, circumventing the phase segregation of Au and Ag encountered in conventional synthesis. The resulting core–shell structured bimetallic nanorods (AuNR@AuAg) have well-mixed Au and Ag atoms in their shell without discernible domains. This degree of mixing allows AuNR@AuAg to combine the high stability of Au with the superior plasmonic activity of Ag, thus outperforming seemingly similar nanostructures with monometallic shells (e.g., Ag-coated Au NRs (AuNR@Ag) and Au-coated Au NRs (AuNR@Au)). AuNR@AuAg is comparable to AuNR@Ag in plasmonic activity, but that it is markedly more stable toward oxidative treatment. Specifically, AuNR@AuAg and AuNR@Ag exhibit similarly strong signals in surface-enhanced Raman spectroscopy that are some 30-fold higher than that of AuNR@Au. When incubated with a H2O2 solution (0.5 m), the plasmonic activity of AuNR@Ag immediately and severely decayed, whereas AuNR@AuAg retained its activity intact. Moreover, the longitudinal SPR frequency of AuNR@AuAg can be tuned throughout the red wavelengths (≈620–690 nm) by controlling the thickness of the AuAg alloy shell. The synthetic strategy is versatile to fabricate AuAg alloyed shells on different shaped Au, with prospects for new possibilities in the synthesis and application of plasmonic nanocrystals.
KAUST Department:
Advanced Membranes and Porous Materials Research Center; Physical Sciences and Engineering (PSE) Division; PRIMALIGHT Research Group; Electrical Engineering Program; Applied Mathematics and Computational Science Program; Imaging and Characterization Core Lab
Citation:
Fabricating a Homogeneously Alloyed AuAg Shell on Au Nanorods to Achieve Strong, Stable, and Tunable Surface Plasmon Resonances 2015:n/a Small
Journal:
Small
Issue Date:
13-Aug-2015
DOI:
10.1002/smll.201501220; 10.1002/smll.201570243
Type:
Article
ISSN:
16136810
Additional Links:
http://doi.wiley.com/10.1002/smll.201501220
Appears in Collections:
Articles; Advanced Membranes and Porous Materials Research Center; Advanced Nanofabrication, Imaging and Characterization Core Lab; Applied Mathematics and Computational Science Program; Physical Sciences and Engineering (PSE) Division; PRIMALIGHT Research Group; Electrical Engineering Program

Full metadata record

DC FieldValue Language
dc.contributor.authorHuang, Jianfengen
dc.contributor.authorZhu, Yihanen
dc.contributor.authorLiu, Changxuen
dc.contributor.authorZhao, Yunfengen
dc.contributor.authorLiu, Zhaohuien
dc.contributor.authorHedhili, Mohamed N.en
dc.contributor.authorFratalocchi, Andreaen
dc.contributor.authorHan, Yuen
dc.date.accessioned2015-08-18T08:20:45Zen
dc.date.available2015-08-18T08:20:45Zen
dc.date.issued2015-08-13en
dc.identifier.citationFabricating a Homogeneously Alloyed AuAg Shell on Au Nanorods to Achieve Strong, Stable, and Tunable Surface Plasmon Resonances 2015:n/a Smallen
dc.identifier.issn16136810en
dc.identifier.doi10.1002/smll.201501220en
dc.identifier.doi10.1002/smll.201570243en
dc.identifier.urihttp://hdl.handle.net/10754/574950en
dc.description.abstractColloidal metal nanocrystals with strong, stable, and tunable localized surface plasmon resonances (SPRs) can be useful in a corrosive environment for many applications including field-enhanced spectroscopies, plasmon-mediated catalysis, etc. Here, a new synthetic strategy is reported that enables the epitaxial growth of a homogeneously alloyed AuAg shell on Au nanorod seeds, circumventing the phase segregation of Au and Ag encountered in conventional synthesis. The resulting core–shell structured bimetallic nanorods (AuNR@AuAg) have well-mixed Au and Ag atoms in their shell without discernible domains. This degree of mixing allows AuNR@AuAg to combine the high stability of Au with the superior plasmonic activity of Ag, thus outperforming seemingly similar nanostructures with monometallic shells (e.g., Ag-coated Au NRs (AuNR@Ag) and Au-coated Au NRs (AuNR@Au)). AuNR@AuAg is comparable to AuNR@Ag in plasmonic activity, but that it is markedly more stable toward oxidative treatment. Specifically, AuNR@AuAg and AuNR@Ag exhibit similarly strong signals in surface-enhanced Raman spectroscopy that are some 30-fold higher than that of AuNR@Au. When incubated with a H2O2 solution (0.5 m), the plasmonic activity of AuNR@Ag immediately and severely decayed, whereas AuNR@AuAg retained its activity intact. Moreover, the longitudinal SPR frequency of AuNR@AuAg can be tuned throughout the red wavelengths (≈620–690 nm) by controlling the thickness of the AuAg alloy shell. The synthetic strategy is versatile to fabricate AuAg alloyed shells on different shaped Au, with prospects for new possibilities in the synthesis and application of plasmonic nanocrystals.en
dc.language.isoenen
dc.relation.urlhttp://doi.wiley.com/10.1002/smll.201501220en
dc.rightsThis is the peer reviewed version of the following article: Huang, J., Zhu, Y., Liu, C., Zhao, Y., Liu, Z., Hedhili, M. N., Fratalocchi, A. and Han, Y. (2015), Fabricating a Homogeneously Alloyed AuAg Shell on Au Nanorods to Achieve Strong, Stable, and Tunable Surface Plasmon Resonances. Small. doi: 10.1002/smll.201501220, which has been published in final form at http://doi.wiley.com/10.1002/smll.201501220. This article may be used for non-commercial purposes in accordance With Wiley Terms and Conditions for self-archiving.en
dc.subjectAg stabilityen
dc.subjectAu nanorodsen
dc.subjecthigh plasmonic activitiesen
dc.subjecthomogeneous AuAg alloysen
dc.subjecttunable surface plasmon resonancesen
dc.titleFabricating a Homogeneously Alloyed AuAg Shell on Au Nanorods to Achieve Strong, Stable, and Tunable Surface Plasmon Resonancesen
dc.typeArticleen
dc.contributor.departmentAdvanced Membranes and Porous Materials Research Centeren
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.contributor.departmentPRIMALIGHT Research Groupen
dc.contributor.departmentElectrical Engineering Programen
dc.contributor.departmentApplied Mathematics and Computational Science Programen
dc.contributor.departmentImaging and Characterization Core Laben
dc.identifier.journalSmallen
dc.eprint.versionPost-printen
dc.contributor.affiliationKing Abdullah University of Science and Technology (KAUST)en
kaust.authorZhu, Yihanen
kaust.authorLiu, Changxuen
kaust.authorZhao, Yunfengen
kaust.authorHedhili, Mohamed N.en
kaust.authorFratalocchi, Andreaen
kaust.authorHan, Yuen
kaust.authorHuang, Jianfengen
kaust.authorLiu, Zhaohuien
All Items in KAUST are protected by copyright, with all rights reserved, unless otherwise indicated.