Berlin 2012 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 9: Invited talk (Shigeki Kawai)

O 9.1: Hauptvortrag

Montag, 26. März 2012, 15:00–15:45, H 2013

Three dimensional dynamic force spectroscopy at room temperature — •Shigeki Kawai and Ernst Meyer — Klingelbergstrasse 82, CH-4056 Basel

Measurement of force and potential above the surface is of crucial importance to investigate the adsorption and friction on a surface at atomic-scale. Such information can be extracted via the frequency shift of an oscillating cantilever in dynamic force spectroscopy (DFS). Since the first site-dependent measurement of the force in 2001, this technique rapidly evolved, and is now used for high-resolution three-dimensional force mapping mainly at low temperature where the thermal drift is negligibly small.

Here we realized 3D-DFS measurements even at room temperature (RT). The thermal drift as a critical issue in the measurement at RT was precisely excluded by an atom-tracked tip-positioning, which was activated each before the distance dependence measurement. Then, high-density and high*resolution 3D force field was measured on ionic crystal surfaces and self-assembled molecule. A detailed contact mechanism such as deformations of the surface and tip and movement of the molecule was studied.