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- W2553930138 abstract "The medium energy ion scattering (MEIS) facility at the IIAA Huddersfield has been usedfor the analysis of a monolayer of Au-silica core-shell nanoparticles deposited on Si substrate.Both spherical and rod shape particles were investigated and the spectra produced by 100 keV He+ions scattered through angles of 90o and 125o were compared with the results of RBS-MAST [1]simulations performed on artificial 3D model cells containing the nanoparticles. The thickness ofthe silica shell, the diameter of the Au spheres, and the diameter and length of the Au nano-rodswere determined from best fits of the measured set of MEIS spectra.In addition, the effect of ion irradiation on the silica shell and gold core was monitored byMEIS measurements in conjunction with RBS-MAST simulations. Ion bombardment wasperformed under largely different conditions, i.e., by 30 keV Ar+, 150 keV Fe+, or 2.8 MeV N+ions in the dose range of 2×1015 - 2×1016 cm-2. Significant changes in the particle geometry can beobserved due to ion beam-induced sputtering and recoil effects, the significance of which wasestimated from full-cascade SRIM simulations.Rutherford backscattering spectrometry (RBS), Field emission scanning electron microscopy(FESEM), and Atomic Force Microscopy (AFM) techniques have been applied as complementarycharacterization tools to monitor the amount of gold and surface morphology on the un-irradiatedand irradiated sample areas. We show that MEIS can yield spatial information on the geometricalchanges of particulate systems at the nanometre scale." @default.
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- W2553930138 date "2016-08-11" @default.
- W2553930138 modified "2023-10-16" @default.
- W2553930138 title "A Three Dimensional Analysis of Au-Silica Core-Shell Nanoparticles Using Medium Energy Ion Scattering" @default.
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