Lee Byeongdu, Seifert Sönke, Riley Stephen J, Tikhonov George, Tomczyk Nancy A, Vajda Stefan, Winans Randall E
Experimental Facility Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439, USA.
J Chem Phys. 2005 Aug 15;123(7):074701. doi: 10.1063/1.1999627.
The size evolution of platinum nanoparticles formed on a SiO2/Si(111) substrate as a function of the level of surface coverage with deposited clusters has been investigated. The anisotropic shapes of sub-nanometer-size nanoparticles are changed to isotropic on the amorphous substrate as their sizes increased. Using anomalous grazing incidence small-angle x-ray scattering (AGISAXS), the scattering from nanoparticles on the surface of a substrate is well separated from that of surface roughness and fluorescence. We show that AGISAXS is a very effective method to subtract the background and can provide unbiased information about particle sizes of less than 1 nm.
