X-ray absorption of gold nanoparticles with thin silica shell.
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.
Park
Yeon-Su
YS
Center for Interdisciplinary Research, Tohoku University, Sendai 9808578, Japan.
Liz-Marzán
Luis M
LM
Kasuya
Atsuo
A
Kobayashi
Yoshio
Y
Nagao
Daisuke
D
Konno
Mikio
M
Mamykin
Sergiy
S
Dmytruk
Andriy
A
Takeda
Motohiro
M
Ohuchi
Noriaki
N
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
D003102:Colloids; D003287:Contrast Media; D006046:Gold; D012822:Silicon Dioxide