Talk given by Dr. Stefan Walheim Angewandte Physik (APH) und Institute of Nanotechnology (INT), KIT Abstract: Nano-patterning of surfaces is of vital importance for many fields of Nanotechnology. We develop methods for the structuring of surfaces based on nano phase separation in thin polymer films and by Atomic Force Microscopy (AFM) structuring techniques. The resulting patterns typically measure only one nanometer in height and consist of films with molecular thickness: Self-Assembled Monolayers (SAMs). With our Monolayer Polymer Blend Lithography (Monolayer PBL) we are able to pattern large areas in the square inch range by self-organization. By subsequent assembly of e.g. optically switchable molecules, metals, inorganic particles like ZnO, metal-organic compounds like SCMOLs or SURMOFs or biological macromolecules like DNA or proteins we are able to achieve a variety of unique functional surfaces. Here, we use AFM techniques 1) to investigate the growth process (topography) and 2) to probe the functionality of the resulting patterns (piezo-response, optical switchability, mechanical and electrical characterization). With Metal Polymer Blend Lithography (Metal PBL) we produce with the same ease metal films with 1 billion holes/ inch² or 1 billion metal island/inch² with adjustable plasmonic properties. We introduce ordered arbitrary layout-defined patterns into the phase morphology of a block-copolymer film being otherwise only stochastically structured. Based on this approach we can (phase-)structure the active surface of a topographically flat stamp for ink-based printing with a unique stamping resolution of 20 nm (Nano-contact printing). In a biomimetic approach we are combining the described techniques above to produce air-retaining surfaces for drag reduction of ship hulls. Here hierarchically structures with length scales from nanometers to millimeters are defined 3-dimensionally: Mouldable, elastic structures for artificial (superhydrophobic) salvinia-type surfaces. our new demonstrator boat will be presented. All patterning processes have the potential to be scaled up e.g. for roll-to-roll processing, making them interesting for ship coatings, solar cells or battery applications.

This event is part of the eventgroup INT Talks

Homepage
https://www.int.kit.edu/events.php

Speaker
Dr. Stefan Walheim

Institut of Nanotechnology, KIT
http://www.int.kit.edu/staff_stefan.walheim.php

Organizer
Dr. Matthias Hettler
Institut für Nanotechnologie
KIT
Karlsruhe
Mail: matthias hettler ∂does-not-exist.kit edu
https://www.int.kit.edu

Targetgroup
Interested / Everyone