title: Reshaping nanocrystals for tunable plasmonic substrates.
abstract: Plasmonic nanostructures with tunable optical properties and their designed spatial arrangements can facilitate a variety of application ranging from plasmonics to biosensors with unprecedented sensitivity. Here we describe a facile and versatile method for fabricating tunable plasmonic substrates based on the reshaping of metal nanocrystals. Anisotropic etching and redeposition of Ag atoms mediated by halide ions transformed Ag nanoprisms deposited on two- or three-dimensional surfaces or in solution into nanostructures with an oblate spheroidal shape, and corresponding localized surface plasmon resonances features could be tuned. The reshaping nanocrystal strategy can even facilitate the preparation of new classes of plasmonic substrates with gradient or patterned plasmonic properties, which cannot be realized easily using existing lithographic techniques. The substrates with gradient plasmonic properties can serve as platforms for tunable surface-enhanced Raman scattering.
authors.affiliation: Department of Chemistry and KI for the NanoCentury, KAIST, Daejeon 305-701, Korea.
authors.forename: Minjung
authors.initials: M
authors.lastname: Kim
authors.forename: Young Wook
authors.initials: YW
authors.lastname: Lee
authors.forename: Dongheun
authors.initials: D
authors.lastname: Kim
authors.forename: Seunghoon
authors.initials: S
authors.lastname: Lee
authors.forename: Soo-Ryoon
authors.initials: SR
authors.lastname: Ryoo
authors.forename: Dal-Hee
authors.initials: DH
authors.lastname: Min
authors.forename: Sang Bok
authors.initials: SB
authors.lastname: Lee
authors.forename: Sang Woo
authors.initials: SW
authors.lastname: Han