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We report a direct observation of dramatic mass transport due to 1.5 MeV Au2+ion impact on isolated Au nanostructures of an average size 7.6 nm and a height6.9 nm that are deposited on Si (111) substrate under high flux (3.2x10^10 to6.3x10^12 ions cm-2 s-1) conditions. The mass transport from nanostructuresfound to extend up to a distance of about 60 nm into the substrate, much beyondtheir size. This forward mass transport is compared with the recoilimplantation profiles using SRIM simulation. The observed anomalies with theoryand simulations are discussed. At a given energy, the incident flux plays amajor role in mass transport and its re-distribution. The mass transport isexplained on the basis of thermal effects and creation of rapid diffusion pathsat nano-scale regime during the course of ion irradiation. The unusual masstransport is found to be associated with the formation of gold silicidenanoalloys at sub-surfaces. The complexity of the ion-nanostructure interactionprocess has been discussed with a direct observation of melting (in the form ofspherical fragments on the surface) phenomena. The transmission electronmicroscopy, scanning transmission electron microscopy and Rutherfordbackscattering spectroscopy methods have been used.

Flux dependent MeV self-ion- induced effects on Au nanostructures: Dramatic mass transport and nano-silicide formation