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Enhanced control of plasmonic properties of silver-gold hollow nanoparticles via a reduction-assisted galvanic replacement approach.

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R Daniel, Josée 
McCarthy, Lauren A 
Ringe, Emilie 


Hollow noble metal nanoparticles are of growing interest due to their localized surface plasmon resonance (LSPR) tunability. A popular synthetic approach is galvanic replacement which can be coupled with a co-reducer. Here, we describe the control over morphology, and therefore over plasmonic properties including energy, bandwidth, extinction and scattering intensity, offered by co-reduction galvanic replacement. This study indicates that whereas the variation of atomic stoichiometry using the co-reduction method described in this work offers a rather modest tuning range of LSPR energy when compared to traditional galvanic replacement, it nevertheless has a profound effect on shell thickness, which imparts a degree of control over scattering intensity and sensitivity to changes in the dielectric constant of the surrounding environment. Therefore, in this context particle size and gold content become two design parameters that can be used to independently tune LSPR energy and intensity.



3403 Macromolecular and Materials Chemistry, 34 Chemical Sciences, Nanotechnology, Bioengineering, 7 Affordable and Clean Energy

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Royal Society of Chemistry (RSC)
This research was supported by the American Chemical Society Petroleum Research Fund under grant number 56256 DNI5 (E. R.) and a 3M Nontenured Faculty Award (E. R.). L. A. M. wishes to acknowledge financial support from a National Science Foundation Graduate Research Fellowship #1450681. D. B. and J. R. D. acknowledge funding from the Natural Sciences and Engineering Research Council of Canada, the Canadian Foundation for Innovation and the Fonds de la Recherche du Québec