A5031150055- Surface Chemistry and Catalysis
- Spectroscopy and Quantum Chemical Studies
- Molecular Junctions and Nanostructures
- Covalent Organic Framework Applications
- Surface and Thin Film Phenomena
- Photonic Crystals and Applications
- Theoretical and Computational Physics
Technical University of Munich
2014-2020
Deutsches Museum
2014-2020
Max Planck Computing and Data Facility
2017
Nanosystems Initiative Munich
2017
Center for NanoScience
2014
On-surface Ullmann coupling is a versatile and appropriate approach for the bottom-up fabrication of covalent organic nanostructures. In two-dimensional networks, however, kinetically controlled irreversible leads to high defect densities lack long-range order. To derive general guidelines optimizing reaction parameters, structural quality 2D porous networks was evaluated different preparation protocols. For this purpose, polymerization an iodine- bromine-functionalized precursor studied on...
Encoding information in the chemical structure of tectons is pivotal strategy self-assembly for realization targeted supramolecular structures. However, frequently observed polymorphism monolayers provides experimental evidence a decisive additional influence environmental parameters, such as solute concentration or type solvent, on selection. While concentration-induced comparatively well understood, thermodynamic and molecular origins solvent-induced remain elusive. To shed light this...
Self-assembly of benzene-1,3,5-tricarboxylic acid (trimesic – TMA) monolayers at the alkanoic acid–graphite interface is revisited. Even though this archetypal model system for hydrogen bonded porous networks particularly well studied, analysis routinely observed superperiodic contrast modulations known as moiré patterns lags significantly behind. Fundamental questions remain unanswered such as, are periodicity and orientation always same, <italic>i.e.</italic> exclusively only one specific...
Fundamental insights into the kinetics and thermodynamics of supramolecular self-assembly on surfaces are uniquely gained by variable-temperature high-resolution Scanning-Tunneling-Microscopy (STM). Conventionally, these experiments performed with standard ambient microscopes extended heatable sample stages for local heating. However, unavoidable solvent evaporation sets a technical limit duration experiments, hence prohibiting long-term experiments. These, however, would be highly desirable...
Kinetic effects in monolayer self-assembly at liquid–solid interfaces are not well explored but can provide unique insights. We use variable-temperature scanning tunneling microscopy (STM) to quantify the desorption kinetics of 2,6-naphthalenedicarboxylic acid (NDA) monolayers nonanoic acid–graphite interfaces. Quantitative tracking decline molecular coverages by STM between 57.5 and 65.0 °C unveiled single-exponential decays over course days. An Arrhenius plot rate constants derived from...