Nearly equidistant single swift heavy ion impact sites through nanoporous alumina masks

Abstract

A semi-ordered pattern of 70 MeV Ag single ion impact sites on a fused silica sample was achieved by irradiation through a free-standing 10 µm through-pore ordered nanoporous alumina membrane. The membranes were fabricated by constant voltage anodization in oxalic acid with a two-step replication process. An apparatus and a method were developed to realize the alignment of the pores parallel to the ion beam. Measurements of the surface, by atomic force microscopy, confirm the presence of a semi-ordered pattern of single ion impact sites.

A simulation study of mega electron-volt helium ion channeling and shadow effect in titania nanotubes

“…Nevertheless, when a nanoporous or nanotube array film is placed on the top of the area in which ions are implanted, instead of being randomly spread, ions end up making isolated impact sites. 29 In order to verify the channeling effect in titania nanotubes, we simulated the propagation of high energy doubly ionized helium ions incident at various angles on titania nanotubes of pore diameter B100 nm. We report here the results of this work.…”