Dresden 2020 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 63: Focus Session: Functional Molecules at Surfaces III
O 63.5: Vortrag
Mittwoch, 18. März 2020, 11:45–12:00, TRE Ma
The role of the dipole moment in electric field induced manipulation of molecules and nanostructures — •Tim Kühne1, Kwan Ho Au Yeung1, Frank Eisenhut1, Oumaima Aiboudi3, Dmitry Ryndyk2, Gianaurelio Cuniberti2, Brigitte Voit3, Franziska Lissel3, and Francesca Moresco1 — 1Center for Advancing Electronics Dresden, TU Dresden, Germany — 2Institute for Materials Science, TU Dresden, Germany — 3Leibniz Institute of Polymer Research, Dresden, Germany
Among the different mechanisms that can be used to drive a molecule on a surface by STM, we used voltage pulses to investigate the movement properties of di-tert-Butyl 2-isocyanoazulene-1,3-dicarboxylate (BCA) molecules. On the Au(111) surface, we observed single molecules and dimers, as well as the formation of metal-organic complexes with gold adatoms. Even if the pure molecule has a strong dipole moment in the gas phase, only metal-organic complexes could be moved by voltage pulses. Measurements at different bias and tip height conditions revealed the electric field effect as main driving force of this motion. In this talk, we discuss the observed movement properties with respect to the molecule dipole moment and the charge distribution of molecules and molecular nanostructures.