- Prof. Meike Stöhr (University of Groningen)
- Thursday 12 October 2017
- Gorlaeus Building
2333 CC Leiden
Low-dimensional (supra)molecular assemblies on surfaces: fabrication and characterization
The interest in studying organic nanostructures on surfaces emerges from their prospective usage as nanoscale functional materials in applications ranging from electronics to spintronics and catalysis. By making use of molecular recognition processes based on non-covalent interactions, well-ordered 1D and 2D molecular structures can be formed on surfaces. However, since the underlying interactions for such structures can be rather weak, on-surface covalent coupling has emerged as a viable alternative for obtaining structures with improved stability and conductivity. Understanding the interplay of the underlying intermolecular and molecule-substrate interactions holds the prospect of being able to deliberately tune the functional properties of the organic nanostructures.
In my presentation I will focus on the one side on the influence of the substrate on molecular self-assembly. For this purpose, we adsorbed the same molecule (1,3,5-benzenetribenzoic acid) on Cu(111), Au(111) and graphene/Cu(111)  and observed a decreasing molecule-substrate interaction (when keeping the order of the substrates). In particular, for Au(111) we observed a modification of the electronic surface properties based on quantum confinement. On the other side, I will show tow examples where we made use of Ullmann-type coupling for the formation of covalently coupled molecular structures .
 S. Gottardi et al., Nano Lett. 15 (2015) 917; J. Li et al., J. Phys. Chem. C 120 (2016) 18093.
 T.A. Pham et al., Small 13 (2017) 1603675; Q. Sun et al., Angew. Chem. Int. Ed. 56 (2017) 12165.