title: Patchy and multiregion janus particles with tunable optical properties.
abstract: Multiregion and patchy optically active Janus particles were synthesized via a hierarchical self-assembly process. Gold nanoparticles were assembled on the top surfaces of nano- and submicrometer silica particles, which were selectively protected on their bottom surfaces by covalent attachment to a copolymer film. The morphologies of the gold particle layer, and the resulting optical properties of the Janus particles, were tuned by changing the surface energy between the silica and gold particles, followed by annealing.
authors.affiliation: Department of Materials Science and Engineering and Laboratory for Research on the Structure of Matter, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.
authors.forename: Marla D
authors.initials: MD
authors.lastname: McConnell
authors.forename: Matthew J
authors.initials: MJ
authors.lastname: Kraeutler
authors.forename: Shu
authors.initials: S
authors.lastname: Yang
authors.forename: Russell J
authors.initials: RJ
authors.lastname: Composto
mesh_terms: D004867:Equipment Design; D006046:Gold / Q000737:chemistry; D008422:Materials Testing; D053768:Metal Nanoparticles / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning / Q000379:methods; D049329:Nanostructures / Q000737:chemistry*; D036103:Nanotechnology / Q000379:methods*; D055095:Optics and Photonics; D011108:Polymers / Q000737:chemistry; D012822:Silicon Dioxide / Q000737:chemistry; D013499:Surface Properties; D013997:Time Factors
chemical_list: D011108:Polymers; D006046:Gold; D012822:Silicon Dioxide