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Download fileTuneable Metamaterial-like Platforms for Surface-Enhanced Raman Scattering via Three-Dimensional Block Co-polymer-Based Nanoarchitectures
journal contribution
posted on 2019-03-18, 00:00 authored by Carl Banbury, Jonathan James
Stanley Rickard, Sumeet Mahajan, Pola Goldberg OppenheimerSurface-enhanced
Raman spectroscopy (SERS) pushes past the boundaries
and inherent weaknesses of Raman spectroscopy, with a great potential
for a broad range of applications particularly, for sensing. Yet,
current real world applications are limited due to poor reproducibility,
low-throughput, and stability issues. Here, we present the design
and fabrication of self-assembly guided structures based on adjustable
block co-polymer (BCP) nanomorphologies and demonstrate reproducible
SERS enhancement across large areas. Golden three-dimensional (3D)
nanostructured morphologies with controllable dimensions and morphologies
exhibit high chemical stability, enhanced plasmonic properties and
are highly suitable for SERS substrates due to the strong enhancement
of the electromagnetic field. Adjustable, free standing porous nanostructures,
continuous in 3D space are achieved by removal of selected BCP constituents.
Four BCP morphologies and the corresponding achievable enhancement
factors are investigated at 633 and 785 nm excitation wavelengths.
The choice of excitation laser is shown to greatly affect the observed
signal enhancement, highlighting the sensitivity of the technique
to the underlying surface architecture and length scales. By using
BCP assemblies, it is possible to reliably tune these parameters to
match specific applications, thus bridging the gap toward the realization
of applied metamaterials. The fabricated SERS platforms via three-dimensional
block co-polymer-based nanoarchitectures provide a recipe for intelligent
engineering and design of optimized SERS-active substrates for utilization
in the Raman spectroscopy-based devices toward enabling the next-generation
technologies fulfilling a multitude of criteria.
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3 D spacestability issuesworld applicationsBCP morphologiesRaman spectroscopy-based devicesblock co-polymer-based nanoarchitecturesnext-generation technologiesBCP constituentsRaman spectroscopysurface architecturesignal enhancementThree-Dimensional Block Co-polymer-Based Nanoarchitectures Surface-enhanced Raman spectroscopyTuneable Metamaterial-like Platformsblock co-polymerSurface-Enhanced Raman Scatteringlength scalesmorphologies exhibitenhancement factorsnanostructured morphologiesBCP assembliesSERS platformschemical stabilitySERS enhancementelectromagnetic fieldplasmonic propertiesoptimized SERS-active substratesSERS substrates785 nm excitation wavelengthsexcitation laser