Graphene, a single carbon-atomic layer, is a fascinating material as an aromatic platform for chemical reactions. The ?-? stacking interactions between graphene and aromatic molecules can form strong binding interactions, leading to atomic templating reactions for the molecular assembly. Here, we report electrochemical scanning tunneling microscopy (EC-STM) study for the molecular monolayers on graphene/Au(111) surfaces at electrified interfaces. Firstly, structural observations of variously layered graphene on Au(111) are investigated at different electrode potentials. For example, multilayer graphene shows superlattice structures due to interactions between graphene layers on the underlying reconstructed Au(111) structure. Secondly, we shows influences of potential-induced structural changes of underlying Au(111) structures at observed graphene structures. Finally, in-situ molecular adsorption on graphene/Au(111) and their structural changes with respect to an electrode potential are investigated. The structures of molecular monolayers formed through the self-organization are determined by both the interactions of moleules with the graphene surface and the lateral interactions between the moleules. In particular, nanostructure formation can be generated from the diverse structures that result from electrode potential controlled self-assembly of molecules at electrified surfaces. Consequently, molcular nanostructures on graphene at liquid-solid interfaces are varied by the interplay between graphene-moleules, intermolecular, and graphene-underlying Au (111) surface interactions.

Direct observation of molecular monolayers on graphene/Au(111) at electrified interfaces

248th National Meeting (2014)

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