title: Highly Sensitive Plasmonic Optical Sensors Based on Gold Core-Satellite Nanostructures Immobilized on Glass Substrates.
abstract: Fabrication of discrete nanostructures consisting of noble metal nanoparticles immobilized on substrates is challenging because of structural complexity but important for chip-based plasmonic sensor technology. Here we report optical sensing capabilities of core-satellite nanostructures made of gold nanoparticles immobilized on glass substrate, which were fabricated by combining stepwise interconnection of gold nanoparticles through dithiol linkers and surface treatment using vacuum ultraviolet light. The nanostructures exhibit large changes in coupled plasmon resonance peak upon surrounding refractive index, with sensitibity of ca. 350 nm RIU(-1), thus providing highly sensitive optical sensors for determining the surrounding refractive index and detecting organic vapors.
authors.affiliation: Department of Nanobiochemistry, Frontiers of Innovative Research in Science and Technology (FIRST), Konan University , 7-1-20 minatojimaminami, Chuo-ku, Kobe 650-0047, Japan.
authors.forename: Kentaro
authors.initials: K
authors.lastname: Ode
authors.affiliation: Department of Nanobiochemistry, Frontiers of Innovative Research in Science and Technology (FIRST), Konan University , 7-1-20 minatojimaminami, Chuo-ku, Kobe 650-0047, Japan.
authors.forename: Mai
authors.initials: M
authors.lastname: Honjo
authors.affiliation: Department of Nanobiochemistry, Frontiers of Innovative Research in Science and Technology (FIRST), Konan University , 7-1-20 minatojimaminami, Chuo-ku, Kobe 650-0047, Japan.
authors.forename: Yohei
authors.initials: Y
authors.lastname: Takashima
authors.affiliation: Department of Nanobiochemistry, Frontiers of Innovative Research in Science and Technology (FIRST), Konan University , 7-1-20 minatojimaminami, Chuo-ku, Kobe 650-0047, Japan.
authors.forename: Takaaki
authors.initials: T
authors.lastname: Tsuruoka
authors.affiliation: Department of Nanobiochemistry, Frontiers of Innovative Research in Science and Technology (FIRST), Konan University , 7-1-20 minatojimaminami, Chuo-ku, Kobe 650-0047, Japan.
authors.forename: Kensuke
authors.initials: K
authors.lastname: Akamatsu
keywords: core−satellite nanostructures; gold nanoparticles; plasmon coupling; surface plasmon resonance; vapor sensor