title: Uniform circular disks with synthetically tailorable diameters: two-dimensional nanoparticles for plasmonics.
abstract: Herein, we report the synthesis of structurally uniform gold circular disks as two-dimensional plasmonic nanostructures that complement the well-established one-dimensional rod and three-dimensional shell structures. We show that a Au conproportionation reaction can be used to etch a collection of nonuniform triangular prisms into a uniform circular disk product with thickness and diameter varying <10%. These new particles have broadly tunable plasmon resonances (650-1000 nm) with narrow bandwidths (0.23-0.28 eV) and can be described as "effectively two-dimensional" plasmonic structures, as they do not support a significant transverse mode.
authors.affiliation: Department of Chemistry and International Institute for Nanotechnology and ‡Department of Materials Science and Engineering, Northwestern University , 2145 Sheridan Road, Evanston, Illinois 60208 United States.
authors.forename: Matthew N
authors.initials: MN
authors.lastname: O'Brien
authors.forename: Matthew R
authors.initials: MR
authors.lastname: Jones
authors.forename: Kevin L
authors.initials: KL
authors.lastname: Kohlstedt
authors.forename: George C
authors.initials: GC
authors.lastname: Schatz
authors.forename: Chad A
authors.initials: CA
authors.lastname: Mirkin
keywords: Nanoparticle; anisotropic; circular disk; nanoplate; noble metal; plasmonics; triangular prism