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2015 ; 2
(10
): 1436-1442
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Optical Plasmons of Individual Gold Nanosponges
#MMPMID26523285
Vidal C
; Wang D
; Schaaf P
; Hrelescu C
; Klar TA
ACS Photonics
2015[Oct]; 2
(10
): 1436-1442
PMID26523285
show ga
The search for novel plasmonic nanostructures, which can act simultaneously as
optical detectors and stimulators, is crucial for many applications in the fields
of biosensing, electro- and photocatalysis, electrochemistry, and biofuel
generation. In most of these areas, a large surface-to-volume ratio, as well as
high density of active surface sites, is desirable. We investigate sponge-like,
that is, fully porous, nanoparticles, called nanosponges, where both the gold and
the air phase are fully percolated in three dimensions. We correlate, on a single
nanoparticle basis, their optical scattering spectra (using dark field
microscopy) with their individual morphology (using electron microscopy). We find
that the scattering spectra of nanosponges depend only weakly on their size and
outer shape, but are greatly influenced by their unique percolation, in
qualitative agreement with numerical simulations.