Dresden 2003 – wissenschaftliches Programm

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O: Oberflächenphysik

O 12: Postersitzung (Struktur und Dynamik reiner Oberfl
ächen, Grenzfl
äche fest-flüssig, Nanostrukturen, Teilchen und Cluster, Halbleiteroberfl
ächen und Grenzfl
ächen, Zeitaufgelöste Spektroskopie, Rastersondentechniken, Methodisches)

O 12.50: Poster

Montag, 24. März 2003, 18:00–21:00, P1

The Dynamic Surface Modification Technique - Manipulation of Nanostructures and Study of Friction by means of a homebuilt Scanning Force Microscope — •Claudia Ritter1, Markus Heyde2, and Klaus Rademann11Humboldt-University Berlin, Institute of Chemistry, Brook-Taylor-Str. 2, D-12489 Berlin, Germany — 2Lawrence Berkeley National Laboratory, Material Science Division, Mailstop 66-200, Berkeley, CA 94720, USA

We utilise a homebuilt scanning force microscope (SFM) for surface modifications and nanoparticle manipulation by means of the Dynamic Surface Modification (DSM) technique. The technique is based on the increment of the amplitude of the oscillating voltage applied at the dither piezo that drives the cantilever vibrations in the dynamic mode of SFM. Usually, surface modifications by means of a SFM driven in dynamic mode are realized by switching off the feedback loop. In this case, however, non-uniform results might occur due to sample tilt and surface roughness. To avoid such effects, we have successfully induced surface modifications while the feedback loop has been continuously working. This gives us the possibility to perform very precise and controlled manipulation experiments. It is easily possible to switch between imaging mode and DSM mode. We have successfully patterned polymer films (PMMA, PS) and manipulated miscellaneous nanoparticles on surfaces (e.g. antimony and gold islands, small latex spheres as well as cells). Due to this flexibility, the manipulation technique was found to be suitable to study adhesion, cohesion and friction of nanoparticles adsorbed on surfaces.

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DPG-Physik > DPG-Verhandlungen > 2003 > Dresden