Dresden 2017 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 82: Nanostructures at Surfaces: Graphene and Other Aspects

O 82.8: Vortrag

Mittwoch, 22. März 2017, 17:45–18:00, REC/PHY C213

Self-assembly of para-hexaphenyl-dicarbonitrile on graphene on Cu(111) — •Nico Schmidt, Stefano Gottardi, Juan-Carlos Moreno-Lopez, Jun Li, Leonid Solianyk, Leticia Monjas Gomez, Anna Hirsch, and Meike Stöhr — University of Groningen, Groningen, the Netherlands

Graphene is a 2D material exhibiting various outstanding features. Self-assembled molecules on graphene are often studied with respect to altering the electronic properties, i.e., making graphene more suitable for applications. However, the underlying substrate, on which graphene is grown, has been shown to still have an impact on the formation of the molecular adlayer.

In this study, para-hexaphenyl-dicarbonitrile was deposited onto graphene grown on Cu(111) via chemical vapor deposition. The resulting densely-packed network was found to be stabilized by a combination of dipolar coupling and hydrogen bonding. However, the molecular assembly showed no correlation with the varying orientation of the underlying graphene. This showcases the necessity to carefully assess the influence of the substrate in molecule/graphene interfaces. All experiments were carried out under UHV conditions using low-temperature scanning tunneling microscopy and low-energy electron diffraction.