Ghatak, J and Bhatta, M. Umananda and Sundaravel, B and Nair, K. G. M. and Liou, Sz-Chian and Chen, Cheng-Hsuan and Wang, Yuh-Lin and Satyam, P. V. (2008) Flux dependent MeV self-ion-induced effects on Au nanostructures: dramatic mass transport and nanosilicide formation. NANOTECHNOLOGY, 19 (32).
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Official URL: http://www.iop.org/EJ/abstract/0957-4484/19/32/325...
We report a direct observation of dramatic mass transport due to 1.5 MeV Au2+ ion impact on isolated Au nanostructures of average size approximate to 7.6 nm and height approximate to 6.9 nm that are deposited on Si(111) substrate under high flux (3.2 x 10(10) - 6.3 x 10(12) ions cm(-2) s(-1)) conditions. The mass transport from nanostructures was found to extend up to a distance of about 60 nm into the substrate, much beyond their size. This forward mass transport is compared with the recoil implantation profiles using SRIM simulation. The observed anomalies with theory and simulations are discussed. At a given energy, the incident flux plays a major role in mass transport and its redistribution. The mass transport is explained on the basis of thermal effects and the creation of rapid diffusion paths in the nanoscale regime during the course of ion irradiation. The unusual mass transport is found to be associated with the formation of gold silicide nano-alloys at subsurfaces. The complexity of the ion-nanostructure interaction process is discussed with a direct observation of melting (in the form of spherical fragments on the surface) phenomena. Transmission electron microscopy, scanning transmission electron microscopy, and Rutherford backscattering spectroscopy methods have been used.
|Subjects:||Analytical Science > Microscopy and probe methods|
Physical Science > Nanophysics
Physical Science > Nano objects
|Deposited By:||Anuj Seth|
|Deposited On:||17 Dec 2008 13:49|
|Last Modified:||02 Mar 2009 15:48|
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