Structural and chemical evolution of Au-silica core-shell nanoparticles during 20 keV helium ion irradiation: a comparison between experiment and simulation.

ABSTRACT: Au-silica core-shell nanoparticles have been irradiated with 20 keV He⁺ ions up to a maximum fluence of 4.7 × 10¹⁷ ions/cm². The nanoscale structural and crystallographic evolution induced by He⁺ ion irradiation was followed at various stages using Transmission Electron Microscopy (TEM). During irradiation satellite Au clusters are formed around the main Au core, which remained crystalline even after the maximum He⁺ ion fluence. The spherical silica shell deformed into a hemisphere due to He⁺ ion irradiation. Three dimensional Monte-Carlo simulations, based on the binary collision approximation, have been performed on stacked infinite layers and an individual particle. The stacked layers results show that the He⁺

SUBMITTER: Mousley M 

PROVIDER: S-EPMC7374165 | biostudies-literature | 2020 Jul

REPOSITORIES: biostudies-literature