Her, Eun Kyu Chung, Hee-Suk Moon, Myoung-Woon Oh, Kyu Hwan 2024-01-20T21:03:36Z 2024-01-20T21:03:36Z 2021-09-03 2009-07-15 0957-4484 https://pubs.kist.re.kr/handle/201004/132317 Angled nano-scale tunnels with high aspect ratio were fabricated on poly(methyl methacrylate) (PMMA) using a focused ion beam (FIB). The fabrication parameters such as ion fluence, incidence angle, and acceleration voltage of the Ga+ ion beam were first studied on the PMMA surface to explore the formation of the nano-scale configurations such as nano-holes and cones with diameter in the range of 50-150 nm at an ion beam acceleration voltage of 5-20 kV. It was also found that the PMMA surface exposed to FIB was changed into an amorphous graphitic structure. Angled nano-scale tunnels were fabricated with high aspect ratio of 700-1500 nm in depth and 60 nm in mean diameter at an ion beam acceleration voltage of 5 kV and under a specific ion beam current. The angle of the nano-tunnels was found to follow the incident angle of the ion beam tilted from 0 degrees to 85 degrees, which has the potential for creating a mold for anisotropic adhesives by mimicking the hairs on a gecko's feet. English IOP PUBLISHING LTD AMORPHOUS-CARBON POLYMERS FILMS RAMAN IRRADIATION PATTERNS SURFACES An angled nano-tunnel fabricated on poly(methyl methacrylate) by a focused ion beam Article 10.1088/0957-4484/20/28/285301 1 NANOTECHNOLOGY, v.20, no.28 NANOTECHNOLOGY 20 28 scie scopus 000267612600005 2-s2.0-67651148301 Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Applied Science & Technology - Other Topics Materials Science Physics Article AMORPHOUS-CARBON POLYMERS FILMS RAMAN IRRADIATION PATTERNS SURFACES FIB PMMA ion beam nanohole nanotunnel