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

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    Manuscript_Accepted Small.pdf
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    Accepted Manuscript
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    Type
    Article
    Authors
    Huang, Jianfeng cc
    Zhu, Yihan
    Liu, Changxu cc
    Zhao, Yunfeng cc
    Liu, Zhaohui cc
    Hedhili, Mohamed N. cc
    Fratalocchi, Andrea cc
    Han, Yu cc
    KAUST Department
    Advanced Membranes and Porous Materials Research Center
    Applied Mathematics and Computational Science Program
    Chemical Science Program
    Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division
    Electrical Engineering Program
    Imaging and Characterization Core Lab
    Nanostructured Functional Materials (NFM) laboratory
    PRIMALIGHT Research Group
    Physical Science and Engineering (PSE) Division
    Date
    2015-08-13
    Online Publication Date
    2015-08-13
    Print Publication Date
    2015-10
    Permanent link to this record
    http://hdl.handle.net/10754/574950
    
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    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.
    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
    DOI
    10.1002/smll.201501220
    10.1002/smll.201570243
    Additional Links
    http://doi.wiley.com/10.1002/smll.201501220
    ae974a485f413a2113503eed53cd6c53
    10.1002/smll.201501220
    Scopus Count
    Collections
    Articles; Advanced Membranes and Porous Materials Research Center; Imaging and Characterization Core Lab; Applied Mathematics and Computational Science Program; Physical Science and Engineering (PSE) Division; PRIMALIGHT Research Group; Electrical and Computer Engineering Program; Chemical Science Program; Computer, Electrical and Mathematical Science and Engineering (CEMSE) Division

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