Regensburg 2022 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 12: Poster 1

CPP 12.80: Poster

Monday, September 5, 2022, 18:00–20:00, P1

Graphene nanoribbons synthesized on Au(111) and Au(788) in ultra-high vacuum conditions and by atmospheric pressure chemical vapor deposition method — •Vasilii Osipov, Yi Han, Philipp Weitkamp, Max Reimer, Dirk Hertel, and Klaus Meerholz — Chemistry department, University of Cologne, Germany

Graphene nanoribbons (GNRs) are an interesting class of materials due to their tunable width- and edge-type-dependent electronic structure. The state-of-the-art methods of GNRs synthesis are bottom-up processes involving polymerization of precursor molecules at catalytic surfaces, and are typically performed either in ultra-high vacuum (UHV) conditions or by atmospheric pressure chemical vapor deposition (AP-CVD) technique. Despite leading to GNR layers of reduced quality, the AP-CVD method possesses advantages of simplicity and better scalability compared to the UHV one, which make it a promising option for developing routes for synthesis of new types of GNRs. We present results of AP-CVD synthesis of GNRs from different precursors and their comparison to GNRs of corresponding types obtained by UHV method, using Raman spectroscopy. Particularly, degree of GNRs growth geometrical anisotropy, induced by using Au(788) growth substrate instead of Au(111), is investigated by observing the polarization-angle-dependent Raman intensity. This should eventually contribute to better understanding of the processes of GNRs synthesis and to development of technologies for functional (templating) materials for organic electronics.