Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
O: Fachverband Oberflächenphysik
O 6: Organic molecules on inorganic substrates: Adsorption and growth I
O 6.5: Vortrag
Montag, 9. März 2026, 11:30–11:45, TRE/PHYS
Adsorption and Isomerization of Azobenzene Tetramers on Au(111) — •Natasha Khera1, Ebru Cihan1, Franz Plate1, Soyoung Park2, Ningwei Sun2, Dmitry A. Ryndyk1,2, Franziska Lissel2,3, and Francesca Moresco1 — 1Center for Advancing Electronics Dresden, TU Dresden, 01062 Dresden, Germany — 2Leibniz Institute of Polymer Research Dresden, Germany — 3Institute for Applied Polymer Physics, TU Hamburg, 21073 Hamburg, Germany
This work investigates the manipulation and voltage-induced switching of star-shaped azobenzene tetramers [1] on Au(111) using low-temperature ultra-high vacuum scanning tunneling microscopy (LT-UHV STM) to study their adsorption behavior and cis-trans isomerization. On terraces, molecules in the trans state are highly mobile and difficult to image stably, whereas voltage induced switching to the cis state makes them immobile for reliable measurement. The study also utilizes step-edge sites where trans molecules are more stable and can be addressed without prior switching. Voltage pulses with the STM tip produces reproducible switching between high-contrast and low-contrast STM signatures, consistent with the cis-trans isomerization of the azobenzene core. Electric-field-dependent measurements are also performed by retracting the STM tip and recording tip-height vs bias characteristics, providing insight into the electric-field driven response of the molecules.
[1]. M. Baroncini, et al. Nature Chemistry 7, 634-640, (2015)
Keywords: Scanning Tunneling Microscopy; Molecular Manipulation; Switching; Azobenzene