Optical spectroscopy and energy-filtered transmission electron microscopy of surface plasmons in core-shell nanoparticles

Silica-silver core-shell nanoparticles were produced using colloidal chemistry methods. Surface plasmon resonances in the silver shells were investigated using optical absorption measurements in ultraviolet-to-visible (UV-vis) spectroscopy and the effect of shell thickness on the wavelength of the r...

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Bibliographic Details
Published in:Journal of applied physics 2007-01, Vol.101 (2), p.024307-024307-6
Main Authors: Eggeman, Alexander S., Dobson, Peter J., Petford-Long, Amanda K.
Format: Article
Language:English
Subjects:
ABSORPTION
CARBON
CHEMISTRY
ELECTRON MICROSCOPES
PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
PLASMONS
RESONANCE
SILICA
SILVER
SPECTROSCOPY
THICKNESS
TRANSMISSION ELECTRON MICROSCOPY
WAVELENGTHS
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Summary:Silica-silver core-shell nanoparticles were produced using colloidal chemistry methods. Surface plasmon resonances in the silver shells were investigated using optical absorption measurements in ultraviolet-to-visible (UV-vis) spectroscopy and the effect of shell thickness on the wavelength of the resonance was noted. Further studies of the resonances were performed using electron-energy-loss spectroscopy (EELS) and energy-filtered transmission electron microscope (EFTEM) imaging. The plasmon resonance was seen in an EELS spectrum at an energy corresponding to the wavelengths measured in an UV-vis spectrophotometer, and EFTEM images confirmed that the resonance was indeed localized at the surface of the silver shell. Further features were seen in the EELS spectrum and confirmed as bulk-plasmon features of silica and the carbon support film in the TEM specimen.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.2424404