Berlin 2018 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 85: Poster: Tribology and Misc.
O 85.5: Poster
Mittwoch, 14. März 2018, 18:15–20:30, Poster A
Writing information in a self-assembled template of tetraphenylmethane derivatives using a scanning tunneling microscope — •Timo Frauhammer1, Marcin Lindner2, Michal Valasek2, Lukas Gerhard2, Marcel Mayor2,3, and Wulf Wulfhekel1,2 — 1Physikalisches Institut, Karlsruhe Institute of Technology, Germany — 2Institute of Nanotechnology, Karlsruhe Institute of Technology, Germany — 3Department of Chemistry, University of Basel, Switzerland
A self-assembled template of tetraphenylmethane derivatives adsorbed on a Au(111) surface, that exhibits a periodic arrangement of acetyl groups sticking out of the molecular film, is presented. By using the tip of a STM, these acetyl groups can be removed in a spatially controlled way without significantly affecting the remaining molecular assembly. The chemically modified molecules can be distinguished from the non-modified ones such that information can be engraved in the molecular film. The mesh size of this pattern can be tailored by varying the length of the molecular spacer, which enables writing and reading information on the nanoscale with variable letter sizes. Moreover, room temperature measurements indicate that such written structures could even persist room temperature.