Europan Campus Rottal-Inn
S. Biri, M. Mátéfi-Tempfli, Z. Juhász, G.A.B. Gál, I. Rajta, S. Szilasi, Stefan Mátéfi-Tempfli
Nanochannel alignment analysis by scanning transmission ion microscopy
Nanotechnology, vol. 21, no. 29
In this paper a study on the ion transmission ratio of a nanoporous alumina sample is presented. The sample was investigated by scanning transmission ion microscopy (STIM) with different beam sizes. The hexagonally close-packed Al2O3 nanocapillary array, realized as a suspended membrane of 15 µm thickness, had pore diameters of ~ 215 nm and spacing of ~ 450 nm. When the proton beam size was limited to a single domain, a peak transmission ratio of 19% was observed as is expected from the geometry (~19–20%). This result points out an almost perfectly parallel alignment of the capillaries within one domain. However, for larger beam scanning areas (sampling multiple domains) the transmission ratio was reduced to 5%. The STIM analysis over an area larger than the typical domain size revealed an overall capillary angular spread of ~ 2°.