title: Anomalous grazing incidence small-angle x-ray scattering studies of platinum nanoparticles formed by cluster deposition.
abstract: 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.
authors.affiliation: Experimental Facility Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439, USA. blee@aps.anl.gov
authors.forename: Byeongdu
authors.initials: B
authors.lastname: Lee
authors.forename: Sönke
authors.initials: S
authors.lastname: Seifert
authors.forename: Stephen J
authors.initials: SJ
authors.lastname: Riley
authors.forename: George
authors.initials: G
authors.lastname: Tikhonov
authors.forename: Nancy A
authors.initials: NA
authors.lastname: Tomczyk
authors.forename: Stefan
authors.initials: S
authors.lastname: Vajda
authors.forename: Randall E
authors.initials: RE
authors.lastname: Winans