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[资源] Mesoscopic Au “Meatball” Particles

In conclusion, sub-micrometer meatball-like Au
particles provide a very interesting mesoscopic regime
in which their optical responses are determined
by both the mesoscopic size and the particle’s
nanoscale surface roughness. Higher-order
multipole plasmon modes that would be dominant
for smooth Au particles in this size regime are significantly
attenuated by nanoscale surface roughness.
In contrast to small Au nanoparticles within
the dipole limit, the dipole and higher-order multipole
plasmon modes of the sub-micrometer Au
spheres display increased SPR sensitivities to the
dielectric properties of the surrounding medium.
The presence of nanoscale surface roughness significantly increases
near-field enhancements on the particle surface, giving
rise to stable and reproducible SERS enhancements on the order
of 106–107 from individual particles. Close-packed arrays
formed through the self-assembly of the sub-micrometer
meatball-like particles combine the features of nanoscale surface
roughness and the nanoscale interparticle junctions, resulting
in SERS enhancements as large as ∼ 108. The unique
optical properties of these mesoscopic particles and particlearrays hold great potential in chemical sensing and spectroscopic
applications.

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