Publications in Scientific Journals:
R. Kozubek, M. Tripathi, M. Ghorbani-Asl, S. Kretschmer, L. Madauß, E. Pollmann, M. OŽBrien, N. McEvoy, U. Ludacka, T. Susi, G. Duesberg, R. Wilhelm, A. Krasheninnikov, J. Kotakoski, M. Schleberger:
"Perforating Freestanding Molybdenum Disulfide Monolayers with Highly Charged Ions";
Journal of Physical Chemistry Letters,
Porous single-layer molybdenum disulfide (MoS2) is a promising material
for applications such as DNA sequencing and water desalination. In this work, we
introduce irradiation with highly charged ions (HCIs) as a new technique to fabricate
well-defined pores in MoS2. Surprisingly, we find a linear increase of the pore creation
efficiency over a broad range of potential energies. Comparison to atomistic simulations
reveals the critical role of energy deposition from the ion to the material through
electronic excitation in the defect creation process and suggests an enrichment in
molybdenum in the vicinity of the pore edges at least for ions with low potential energies.
Analysis of the irradiated samples with atomic resolution scanning transmission electron
microscopy reveals a clear dependence of the pore size on the potential energy of the
projectiles, establishing irradiation with highly charged ions as an effective method to
create pores with narrow size distributions and radii between ca. 0.3 and 3 nm.
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