Research

The research in the group Molecular Nanostructures at Surfaces joins attractive research fields of molecular self-assembly and graphene. In particular, we utilize graphene as a substrate for molecular self-assembly and explore the possibility to tune the graphene electronic properties to control both the self-assembly process itself and the functional properties of supramolecular layers on the graphene surface.


Next, we offer our expertise in surface analysis (LEEM, LEED, STM, XPS) to our collaborators.

k-Uniform Tiling​

We show that k-uniform tilings possessing several distinct vertices can be prepared from a simple bitopic molecular precursor – 4,4’-biphenyl dicarboxylic acid (BDA) – by its controlled chemical transformation on the Ag(001) surface. The realization of 2- and 3-uniform tilings is enabled by partially carboxylated BDA mediating the seamless connection of two distinct binding motifs in a single long-range ordered molecular phase. 

L. Kormoš, P. Procházka, A.O. Makoveev, J. Čechal, Nat. Commun. 11 (2020), 1856.                         

Electron Beam Doping

 


We employ the low energy electron beam irradiation to induce both n- and p-doping in the graphene layer. The type of dominant charge carriers induced in the graphene depends on the applied gate voltage. Irradiation of the graphene layer at the gate voltages higher (lower) than a specific threshold voltage VT value results in negative (positive) graphene doping. By designing the irradiation protocol the desired CNP position can be set. 

V. Stará, P. Procházka, D. Mareček, T. Šikola, J. Čechal: Nanoscale 10, (2018), 17520.