Regensburg 2016 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 70: Graphene: Electronic Properties
(Joint session of DS, DY, HL, MA, O and TT organized by O)

TT 70.8: Vortrag

Donnerstag, 10. März 2016, 12:15–12:30, S053

Conversion of pyrrolyl-thiophenol self-assembled monolayers (SAMs) into carbon nanomembranes (CNMs) and graphene — •Christof Neumann¹, Matthias Füser², Michael Mohn³, Ute Kaiser³, Andreas Terfort², and Andrey Turchanin¹ — ¹Institute of Physical Chemistry, Friedrich Schiller University Jena, 07743 Jena — ²Institute of Inorganic and Analytical Chemistry, Goethe University Frankfurt, 60348 Frankfurt — ³Electron Microscopy Group of Materials Science, Ulm University, 89081 Ulm

The conversion of aromatic self-assembled monolayers (SAMs) into carbon nanomembranes (CNMs) and graphene presents a promising pathway to the production of a broad variety of functional 2D materials [1]. The properties of these materials can be flexibly tuned via an appropriate choice of the molecular building units for SAMs. Here we investigate the conversion of 4-(1H-pyrrol-1-yl)thiophenol and 4-(2,5-dimethyl-1H-pyrrol-1-yl)thiophenol SAMs on polycrystalline copper foils into CNMs via the electron induced crosslinking. Furthermore, we study the pyrolytic transformation of these CNMs into graphene at temperatures up to 800 °C. We characterize these different conversion steps and the resulting physical and chemical properties of CNMs and graphene by a number of complementary experimental techniques including X-ray photoelectron and Raman spectroscopy, high-resolution transmission electron and helium ion microscopy as well as by electric transport measurements. [1] P. Angelova et al.,: A Universal Scheme to Convert Aromatic Molecular Monolayers into Functional Carbon Nanomembranes, ACS Nano 7, 6489 (2013)