Regensburg 2004 – scientific programme
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O: Oberflächenphysik
O 23: Rastersondentechniken II
O 23.9: Talk
Tuesday, March 9, 2004, 17:45–18:00, H36
Molecular Resolution Imaging of C60 on Au(111) by Dynamic Force Microscopy — •R. Hoffmann1,2, J.M. Mativetsky1, S.A. Burke1, Y. Sun1, and P. Grütter1 — 1Department of Physics, McGill University, Montreal, Canada, H3A 2T8 — 2Physikalisches Institut, Universität Karlsruhe, 76128 Karlsruhe
Dynamic Force Microscopy (DFM) was used to study thin films and clusters of C60 on Au(111). After observing the Au(111) 23 x √3 reconstruction, 2-3 molecular monolayers of C60 were deposited onto the Au surface. The close-packed C60 surface was imaged by DFM with molecular resolution. Enhanced corrugation contrast and an apparent contrast inversion were observed at step edges. Based on a rough spring model calculation, it is proposed that this may be the result of a tip-induced displacement of edge molecules. While imaging small clusters of C60, some molecules were removed by interaction with the tip, leading to structural rearrangements in the clusters.