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2015 ; 1
(11
): e1500988
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From tunable core-shell nanoparticles to plasmonic drawbridges: Active control of
nanoparticle optical properties
#MMPMID26665175
Byers CP
; Zhang H
; Swearer DF
; Yorulmaz M
; Hoener BS
; Huang D
; Hoggard A
; Chang WS
; Mulvaney P
; Ringe E
; Halas NJ
; Nordlander P
; Link S
; Landes CF
Sci Adv
2015[Dec]; 1
(11
): e1500988
PMID26665175
show ga
The optical properties of metallic nanoparticles are highly sensitive to
interparticle distance, giving rise to dramatic but frequently irreversible color
changes. By electrochemical modification of individual nanoparticles and
nanoparticle pairs, we induced equally dramatic, yet reversible, changes in their
optical properties. We achieved plasmon tuning by oxidation-reduction chemistry
of Ag-AgCl shells on the surfaces of both individual and strongly coupled Au
nanoparticle pairs, resulting in extreme but reversible changes in scattering
line shape. We demonstrated reversible formation of the charge transfer plasmon
mode by switching between capacitive and conductive electronic coupling
mechanisms. Dynamic single-particle spectroelectrochemistry also gave an insight
into the reaction kinetics and evolution of the charge transfer plasmon mode in
an electrochemically tunable structure. Our study represents a highly useful
approach to the precise tuning of the morphology of narrow interparticle gaps and
will be of value for controlling and activating a range of properties such as
extreme plasmon modulation, nanoscopic plasmon switching, and subnanometer
tunable gap applications.