title: X-ray absorption of gold nanoparticles with thin silica shell.
abstract: Silica-coated gold (Au) nanoparticles were prepared and their morphological and X-ray absorption properties were investigated. These core-shell type nanoparticles are very stable in aqueous media and may be suitable for an X-ray contrast agent in biological systems. Transmission electron micrographs confirmed well-separated and relatively homogeneous morphology of the nanoparticles in highly concentrated colloids. Peak position for Au plasmon resonance was red-shifted with increasing shell thickness. X-ray absorption by the colloids of silica-coated Au nanoparticles was stronger than that by those of silica-coated Agl nanoparticles, a recently investigated X-ray contrast agent, at similar experimental conditions.
authors.affiliation: Center for Interdisciplinary Research, Tohoku University, Sendai 9808578, Japan.
authors.forename: Yeon-Su
authors.initials: YS
authors.lastname: Park
authors.forename: Luis M
authors.initials: LM
authors.lastname: Liz-Marzán
authors.forename: Atsuo
authors.initials: A
authors.lastname: Kasuya
authors.forename: Yoshio
authors.initials: Y
authors.lastname: Kobayashi
authors.forename: Daisuke
authors.initials: D
authors.lastname: Nagao
authors.forename: Mikio
authors.initials: M
authors.lastname: Konno
authors.forename: Sergiy
authors.initials: S
authors.lastname: Mamykin
authors.forename: Andriy
authors.initials: A
authors.lastname: Dmytruk
authors.forename: Motohiro
authors.initials: M
authors.lastname: Takeda
authors.forename: Noriaki
authors.initials: N
authors.lastname: Ohuchi
mesh_terms: D000042:Absorption; D003102:Colloids / Q000737:chemistry; D003287:Contrast Media / Q000494:pharmacology; D006046:Gold / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry*; D046529:Microscopy, Electron, Transmission; D049329:Nanostructures; D036103:Nanotechnology / Q000295:instrumentation / Q000379:methods*; D010316:Particle Size; D012822:Silicon Dioxide / Q000737:chemistry*; D013499:Surface Properties; D014466:Ultraviolet Rays; D014965:X-Rays
chemical_list: D003102:Colloids; D003287:Contrast Media; D006046:Gold; D012822:Silicon Dioxide