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Characterization and modification of structural and electronic surface properties

Date Mo, 14.04.2014 - Mo, 14.04.2014
Time 16.45
Speaker Meike Stöhr, Zernike Institute for Advanced Materials, University of Groningen, Netherlands
Location ETH Zurich, Hönggerberg Campus, HPF G-6
Program Characterization and modification of structural and electronic surface properties

The interest in studying organic nanostructures on surfaces emerges from their prospective applications in nanoscale electronic or optoelectronic devices, in which the spatially addressable functional units are to be assembled on the molecular level. By making use of molecular recognition processes based on non-covalent interactions, well-ordered 1D and 2D molecular structures can be formed on surfaces. The understanding of the interplay of the underlying intermolecular and molecule substrate interactions is highly important since the resulting molecular structures are based upon these two interactions.
In the first part of my presentation, I will focus – on the basis of perylene derivatives adsorbed on Cu(111) – on supramolecular assemblies based on non-covalent interactions [1]. Through post-annealing of the sample, the intermolecular as well as the molecule substrate interactions can be modified and thereby, the assembly structures can be altered. Through a combination of experimental and theoretical methods, the electronic and structural properties were elucidated. In particular, the interaction of the Cu surface state electrons with an adsorbed porous molecular network was found to change the electronic surface properties.
In the second part of my presentation, I will discuss the possibility to modify graphene´s electronic properties [2] by adsorbing well-ordered 2D molecular networks.

[1] J. Lobo-Checa et al., Science 325 (2009) 300; M. Matena et al., Chem. Eur. J. 16 (2010) 2079 ; M. Matena et al., submitted.
[2] S. Gottardi et al., submitted.
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Link Meike Stöhr
NCCR MUST Office : ETHZ IQE/ULP-HPT H3 | Auguste-Piccard-Hof 1 | 8093 Zurich | E-Mail
The National Centres of Competence in Research (NCCR) are a research instrument of the Swiss National Science Foundation