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O: Fachverband Oberflächenphysik

O 91: Invited Talk (Andrey Turchanin)

O 91.1: Hauptvortrag

Freitag, 4. April 2014, 09:30–10:15, TRE Phy

From organic monolayers to free-standing 2D carbon materials: Carbon nanomembranes, graphene and their heterostructures — •Andrey Turchanin — Faculty of Physics, University of Bielefeld

In this talk it will be demonstrated how monolayers of aromatic molecules can be employed to engineer novel free-standing 2D carbon materials. By electron or photon irradiation, aromatic monolayers are converted into dielectric carbon nanomembranes (CNMs) with a thickness of one molecule, which can be tuned from about 0.5 to 3 nm. CNMs possess high mechanical stability and similar to graphene or other atomically thin 2D materials (e.g., hBN, MoS2) can be separated from their original substrates and transferred onto various other substrates, fabricated as suspended sheets or stacked into multilayer films with precise control over their thickness. By annealing CNMs are converted into graphene. This approach enables both scalable productions of graphene and direct writing of CNM or graphene micro and nanostructures employing e-beam or extreme UV lithography. Layer-by-layer assembly of vertical CNM/graphene heterostructures opens many doors to the engineering of novel materials with tunable electronic, optical and chemical properties. Their characterization by complementary spectroscopy, microscopy, electric and magnetoelectric transport measurements as well as implementation in novel field-effect devices will be presented.