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Title: Interpretation of nanoparticle X-ray photoelectron intensities

X-ray photoelectron (XPS) intensities have been simulated for spherical core-shell nanoparticles (NPs) in different geometrical arrangements in order to investigate the validity of commonly made assumptions for the interpretation of XPS NP intensities. The single-sphere approximation is valid for a powder sample when all spatial coordinates of the NP positions are uncorrelated. Correlations along either the depth coordinate or the lateral coordinates lead to features in the angular distribution that provide information on these correlations. The XPS intensity is proportional to the surface-to-volume ratio of nanoparticles but only for NP sizes exceeding the inelastic mean free path of the photoelectrons.
Authors:
; ;  [1] ;  [2]
  1. Institute of Applied Physics, Vienna University of Technology, Wiedner Hauptstra├če 8-10, A-1040 Vienna (Austria)
  2. Materials Measurement Science Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-8370 (United States)
Publication Date:
OSTI Identifier:
22299915
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 24; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; ANGULAR DISTRIBUTION; APPROXIMATIONS; COORDINATES; CORRELATIONS; DEPTH; ELECTRON EMISSION; MEAN FREE PATH; POWDERS; SIMULATION; SPHERES; SPHERICAL CONFIGURATION; SURFACES; X RADIATION; X-RAY PHOTOELECTRON SPECTROSCOPY NANOPARTICLES