Size modification of Au nanoparticles induced by slow highly charged ions Ar-40(q+) irradiation
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Abstract
Size modification of Au nanoparticles (NPs), deposited on the Au-thick film surface and irradiated by slow
highly charged ions (SHCI) 40Arq+ (3 6 q 6 12) with fixed low dose of 4.3 1011 ions/cm2 and various
energy ranging from 74.64 to 290.64 keV at room temperature (293.15 K), was investigated by atomic
force microscopy (AFM) and transmission electron microscopy (TEM). The effect of projectile kinetic
energy on the modified size of NPs was explored by an appropriate choice of the fixed process parameters
such as ion flux, irradiation temperature, incident angle, irradiation time, etc. The morphological changes
of NPs were interpreted by models involving collisional mixing, Ostwald ripening (OR) and inverse Ostwald
ripening (IOR) of spherical NPs on a substrate. A critical kinetic energy as well as a critical potential
energy of the projectile in the Au NPs size modification process were observed