Berlin 2015 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 41: Inorganic/Organic Interfaces
O 41.19: Poster
Dienstag, 17. März 2015, 18:15–21:00, Poster B
Development of a Soft-Landing for Electrospray Deposition — •Micha Elsebach1, Maciej Bazarnik1, Bernhard Bugenhagen2, Annika Frank2, Marc H. Prosenc2, and Roland Wiesendanger1 — 1Institute of Applied Physics, University of Hamburg, D-20355 Hamburg, Germany — 2Institute of Inorganic Chemistry, University of Hamburg, D-20146 University of Hamburg, Germany
"Electrospray Deposition (ESD)" is a technique to prepare clean samples of large molecules on metal substrates. Some of the molecules are fragmented when they land on the substrate. The "Soft-Landing-ratio" gives the proportion of the intact landed molecules in comparison to the total number of deposited molecules.
In order to improve this ratio we used an electric field to slow down the molecules right before they hit the substrate. When the ionized molecules arrive at the sample they lose their charge. This induces a current flow from the sample to a readout. An electric circuit was implemented to provide a simultaneous measurement of this current and to apply a bias voltage onto the sample producing the electric deceleration field. The effect of this field is tested by depositing triplesalophene molecules on a Au(111)-surface. By the use of STM the SL-ratio was determined in dependence of the electric field strength.
It has been found that the SL-ratio can be improved by the deceleration field. Up to a threshold value of 7.5 eV per charge, for the energy of the molecules, it increases. Additionally, a simulation gives an insight into the electric field's shape.