R.A. Wilhelm, E. Gruber, R. Ritter, R. Heller, A. Beyer, A. Turchanin, N. Klingner, R. Hübner, M. Stöger-Pollach, H. Vieker, G. Hlawacek, A. Gölzhäuser, S. Facsko, F. Aumayr:
"Threshold and efficiency for perforation of 1 nm thick carbon nanomembranes with slow highly charged ions";
Cross-linking of a self-assembled monolayer of 1,1′-biphenyl-4-thiol by low energy electron
irradiation leads to the formation of a carbon nanomembrane, that is only 1 nmthick. Here we study
the perforation of these freestanding membranes by slow highly charged ion irradiation with respect
to the pore formation yield. It is found that a threshold in potential energy of the highly charged ions of
about 10 keV must be exceeded in order to form round pores with tunable diameters in the range of
5-15 nm. Above this energy threshold, the efficiency for a single ion to form a pore increases from
70% to nearly 100% with increasing charge. These findings are verified by two independent methods,
namely the analysis of individual membranes stacked together during irradiation and the detailed
analysis of exit charge state spectra utilizing an electrostatic analyzer.
CNM, SAM, membrane, slow highly charged ion
Erstellt aus der Publikationsdatenbank der Technischen Universitšt Wien.