Dresden 2017 – scientific programme
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O: Fachverband Oberflächenphysik
O 94: Graphene: Electronic Properties, Structure and Substrate Interaction II
O 94.10: Talk
Thursday, March 23, 2017, 17:15–17:30, TRE Ma
Bottom-up synthesis of graphene nanomembranes with tunable porosity — •Christof Neumann1, Michael Mohn2, Matthias Füser3, David Kaiser1, Ute Kaiser2, Andreas Terfort3, and Andrey Turchanin1 — 1Institute of Physical Chemistry, Friedrich Schiller University Jena, 07743 Jena — 2Electron Microscopy Group of Materials Science, Ulm University, 89081 Ulm — 3Institute of Inorganic and Analytical Chemistry, Goethe University Frankfurt, 60348 Frankfurt
The potential of 2D materials like carbon or graphene nanomembranes [1] for separation or ultrafiltration applications is based on the unique features of these novel nanomaterials having pore sizes suitable for molecular sieving and negligible thicknesses compared to the molecular mean free paths or even below. Here we present a versatile method for tuning the properties of graphene nanomembranes by conversion of 4-(1H-pyrrol-1-yl)thiophenol, 4-(2,5-dimethyl-1H-pyrrol-1-yl)thiophenol and 4-(pyrimidin-2-yl)phenylthiol self-assembled monolayers (SAMs) on polycrystalline copper foils into carbon nanomembranes (CNMs) via electron induced crosslinking and their further pyrolytic transformation into the nanoporous graphene monolayers. We characterize the resulting SAMs, CNMs and graphene-nanomembranes by different complementary techniques including X-ray photoelectron (XPS) and Raman spectroscopy, atomic force (AFM), helium ion (HIM) and high-resolution transmission electron microscopy (HRTEM) as well as by electric transport measurements. [1] A. Turchanin and A. Gölzhäuser, Adv. Mater. 28, 5075 (2016)