Uniform Circular Disks With Synthetically TailorableDiameters: Two-Dimensional Nanoparticles for Plasmonics.

Herein, we report the synthesis ofstructurally uniform gold circulardisks as two-dimensional plasmonic nanostructures that complementthe well-established one-dimensional rod and three-dimensional shellstructures. We show that a Au conproportionation reaction can be usedto etch a collection of nonuniform triangular prisms into a uniformcircular disk product with thickness and diameter varying <10%.These new particles have broadly tunable plasmon resonances (650–1000nm) with narrow bandwidths (0.23–0.28 eV) and can be describedas “effectively two-dimensional” plasmonic structures,as they do not support a significant transverse mode. [ABSTRACT FROM AUTHOR]