title: Plasmonic activity on gold nanoparticles embedded in nanopores formed in a surface layer of silica glass by swift-heavy-ion irradiation.
abstract: Silica glass was irradiated by swift heavy ions by selecting the ion species and its energy in order to induce the largest damaged regions. These regions were then selectively etched by hydrofluoric acid vapour to form nanopores on the glass surface. Subsequently, gold nanoparticles were embedded into the nanopores by vacuum evaporation, followed by thermal treatment. In the new plasmonic structure obtained with these procedures, the localized surface plasmon excitation wavelength induced around the gold nanoparticles was found to show a redshift, which agreed well with the theoretical calculation, when water was introduced into the nanopores. This indicates that the fabricated structure can be used as a sensing element to detect the adhesion of substances such as biomolecules to the nanoparticles by measuring the redshift.
authors.affiliation: Department of Electrical Engineering and Bioscience, Waseda University, Shinjuku, Tokyo 169-8555, Japan. k_nomura@ruri.waseda.jp
authors.forename: Ken-ichi
authors.initials: K
authors.lastname: Nomura
authors.forename: Yoshimichi
authors.initials: Y
authors.lastname: Ohki
authors.forename: Makoto
authors.initials: M
authors.lastname: Fujimaki
authors.forename: Xiaomin
authors.initials: X
authors.lastname: Wang
authors.forename: Koichi
authors.initials: K
authors.lastname: Awazu
authors.forename: Tetsuro
authors.initials: T
authors.lastname: Komatsubara
mesh_terms: D000042:Absorption; D005898:Glass / Q000737:chemistry*; D006046:Gold / Q000737:chemistry*; D020450:Heavy Ions; D053768:Metal Nanoparticles / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D016062:Porosity; D012822:Silicon Dioxide / Q000737:chemistry*; D013057:Spectrum Analysis; D013499:Surface Properties / Q000528:radiation effects; D014867:Water / Q000737:chemistry
chemical_list: D014867:Water; D006046:Gold; D012822:Silicon Dioxide