Colloidal Superstructures with Triangular Cores: Size
Effects on SERS Efficiency
Posted on 2020-06-16 - 19:05
The design of colloidal
nanostructures as surface-enhanced Raman
scattering (SERS) substrates requires control over both structural
and optical characteristics. A widespread expectation is that the
SERS efficiency depends crucially on whether the plasmonic excitation
matches the exciting laser wavelength. However, also the balance between
radiative (scattering) and nonradiative (absorbing) properties plays
a major role, regarding both the efficiency of near-field enhancement
and the experimentally observed signal intensity. We present a study
of the influence of mode-excitation matching and extinction characteristics
for core/satellite superstructures, comprising gold nanotriangles
decorated with small gold nanospheres. The variation of the core size
and aspect ratio allowed tuning the main coupled mode between 700
and 800 nm, from off-resonant through resonant at 785 nm, as well
as tuning extinction contributions, from dominantly absorbing to dominantly
scattering. We observed additional gains of 1–2 orders of magnitude
in signal enhancement, which were correlated to core size and diffuse
optical properties. Our findings indicate a competition between SERS
enhancement and increased scattering losses in larger assemblies.
Thus, a balance of optical parameters is required for efficient SERS
and the development of assemblies as advanced sensing devices.
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Höller, Roland
P. M.; Kuttner, Christian; Mayer, Martin; Wang, Ruosong; Dulle, Martin; Contreras-Cáceres, Rafael; et al. (2020). Colloidal Superstructures with Triangular Cores: Size
Effects on SERS Efficiency. ACS Publications. Collection. https://doi.org/10.1021/acsphotonics.0c00642
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AUTHORS (8)
RH
Roland
P. M. Höller
CK
Christian Kuttner
MM
Martin Mayer
RW
Ruosong Wang
MD
Martin Dulle
RC
Rafael Contreras-Cáceres
AF
Andreas Fery
LL
Luis M. Liz-Marzán