SurfaceScience21 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 51: Poster Session IV: Poster to Mini-Symposium: Free-standing functional molecular 2D materials II
O 51.4: Poster
Dienstag, 2. März 2021, 13:30–15:30, P
Crystalline and amorphous graphene from aromatic precursors — •Katayoun Gharagozloo-Hubmann1, Tibor Lehnert2, Niclas Sven Mueller1, Patryk Kusch1, Ute Kaiser2, and Stephanie Reich1 — 1Department of physics, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany — 2Ulm University, Central Facility of Electron Microscopy, Electron Microscopy Group of Materials Science, Albert Einstein Allee 11, Germany
We study the growth of graphene from (poly)aromatic precursors that react on a substrate while preserving their sp2 structure. These precursors require lower growth temperatures, produce specific types of defects and are self-limited to a monolayer. The growth temperature (T<500°C) for p-Terphenyl is far below the typical growth temperature (T>900°C) from the gaseous precursors. Spherical and chromatic aberration-corrected high-resolution transmission electron microscopy and Raman investigations verify the grown structures: Amorphous and crystalline domains are grown from p-Terphenyl molecules. Correlative near field microscopy and spectroscopy (tip enhanced Raman spectroscopy) confirm the co-exist of both domains. Confocal micro-Raman spectra depict the structure observed by high-resolution TEM as well. Larger precursor molecules Di(naphthylen)anthracene led to the growth of polycrystalline graphene. We present a synthesis route, which delivers monolayered 2-D-carbonmaterial with different degree of order. Amorphous, polycrystalline and also crystalline graphene can be produced by modifying the synthesis condition.