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O: Fachverband Oberflächenphysik
O 36: Posters: Bio/organic Molecules on Surfaces, Graphene, Solid/liquid interfaces, Metal Substrates, Electronic Structure Theory
O 36.46: Poster
Dienstag, 1. April 2014, 18:30–22:00, P1
All-carbon vertical van der Waals heterostructures: Non-destructive functionalization of graphene for electronic applications — Miroslaw Woszczyna1, •Andreas Winter2, Miriam Grothe1, Annika Willunat2, Stefan Wundrack1, Rainer Stosch1, Thomas Weimann1, Franz Ahlers1, and Andrey Turchanin2 — 1Physikalisch-Technische Bundesanstalt, 38116 Braunschweig, Germany — 2Faculty of Physics, University of Bielefeld, 33615 Bielefeld, Germany
We present a route to non-destructive functionalization of graphene via assembly of vertical all-carbon van der Waals heterostructures. To this end, we employ single-layer graphene (SLG) sheets grown by low-pressure methane CVD on Cu foils and large-area dielectric ~1 nm thick amino-terminated carbon nanomembranes (NH2-CNMs) generated by electron-beam-induced crosslinking of aromatic self-assembled monolayers. We encapsulate SLG sheets on oxidized silicon wafers with NH2-CNMs via mechanical stacking and characterize structural, chemical and electronic properties of the formed heterostructures by Raman spectroscopy and X-ray photoelectron spectroscopy as well as by electric and electromagnetic transport measurements. We unambiguously show that functional amino groups are brought in close vicinity of the SLG sheets and that their transport characteristics are not impaired by this functionalization; moreover, we demonstrate a functional response of the heterostructure devices to the protonation of the amino groups in water.