engleski

Swift heavy ion irradiation of graphene: effects of the ion charge states

Material modifications using swift heavy ions usually take into account only electronic stopping power of the ion and its velocity. However, as discussed previously [1], for near surface experiments, ion charge state can also play an important role because ions delivered from accelerators can have lower (or even higher) charge state than equilibrium value for a given beam energy. This can influence rfaces because ion stopping depends on its charge state. Abovementioned effect should be most easily detected in case of ion irradiation of 2D materials such as graphene. In this contribution we present experimental results based on Raman spectroscopy and atomic force microscopy, showing the damage in graphene depends strongly on the charge state of the swift heavy ion. Observed damage behaviour can be correlated with increase in the energy loss due to the ion charge state increase. Molecular dynamics simulations have complemented these experimental results in order to investigate role of the substrate on damage production in graphene. [1] M. Toulemonde, Nucl. Instr. Meth. B 250 (2006) 263.

graphene ; swift heavy ion ; ion track ; MD simulation

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