SurfaceScience21 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 4: Mini-Symposium: Free-standing functional molecular 2D materials I
O 4.5: Vortrag
Montag, 1. März 2021, 12:00–12:15, R2
Low-energy electron irradiation induced synthesis of molecular nanosheets: Influence of the electron beam energy — •Christof Neumann1, Richard A. Wilhelm2,3, Maria Küllmer1, and Andrey Turchanin1 — 1Institute of Physical Chemistry, Friedrich Schiller University Jena, 07743 Jena, Germany — 2Institute of Applied Physics, TU Wien, 1040 Vienna, Austria — 3Institute of Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany
Aromatic self-assembled monolayers (SAMs) can be cross-linked into molecular nanosheets - carbon nanomembranes (CNMs) - via low-energy electron irradiation. Due to their favorable mechanical stability and tunable functional properties, they possess a high potential for various applications including nanosensors and separation membranes. Here, we studied the cross-linking of 4'-nitro-1,1'-biphenyl-4-thiol SAM on gold. The SAM samples were irradiated with different electron energies ranging from 2.5 to 100 eV in ultra-high vacuum and subsequently analysed by complementary techniques including X-ray photoelectron spectroscopy (XPS). To demonstrate the formation of CNMs, the formed two-dimensional molecular materials were transferred onto grids and oxidized wafer and analyzed by different microscopy techniques. We found a strong energy dependence for the cross section for the cross-linking process and conducted a comparative analysis of the cross sections for the C-H bond scission via electron impact ionization and dissociative electron attachment. C. Neumann et al., Faraday Discuss. 2020 DOI: 10.1039/C9FD00119K