XPS characterization of Au (core)/SiO2 (shell) nanoparticles
Correa-Duarte, M. A.
Liz-Marzán, L. M.
Journal of Physical Chemistry B
American Chemical Society
7597 - 7600
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Core-shell nanoparticles with ca. 15-nm gold core and 6-nm silica shell were prepared and characterized by XPS. The Au/Si atomic ratio determined by XPS is independent of the electron takeoff angle because of the concentric spherical shape of the nanoparticles. The formula given by Wertheim and DiCenzo (Phys. Rev. B 1988, 37, 844) for spherical nanoparticles and the modified one by Yang et al. (J. Appl. Phys. 2005, 97, 024303) for core-shell nanoparticles are used to correlate the XPS-derived composition with the geometry of the nanoparticles only after significantly modifying either the bulk density of the silica shell or the attenuation length of the photoelectrons. © 2005 American Chemical Society.
Semiconductor quantum dots
X ray photoelectron spectroscopy