Published July 29, 2015
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Threshold and efficiency for perforation of 1 nm thick carbon nanomembranes with slow highly charged ions
Description
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, which
is only 1nm thick. 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 state. 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.
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