Dresden 2026 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 9: Organic molecules on inorganic substrates: electronic, optical and other properties I
O 9.6: Vortrag
Montag, 9. März 2026, 16:15–16:30, HSZ/0201
Thermal and photo-induced one-dimensional switching of azobenzene derivatives on a graphite surface — •Thiruvancheril Gopakumar1, Hariom Birla1, Showkat H. Mir1, Khushboo Yadav1, Thomas Halbritter2, Alexander Heckel2, and Jayant K. Singh3 — 1Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur 208016, India — 2Institute for Organic Chemistry and Chemical Biology, Goethe-University Frankfurt, Max-von-Laue-Str. 9, 60438 Frankfurt, Germany — 3Department of Chemical Engineering, Indian Institute of Technology Kanpur, Kanpur 208016, India
In this presentation we demonstrate an unusual one-dimensional (1D) cascade effect in the thermal- and photo-induced switching of azobenzene derivatives deposited on graphite surface. Upon thermal- and photo-induction, molecules switch between their geometric states (trans and cis) along a selected lattice within the assembly up to several hundreds of nanometres. Generally, such directionality is observed only for a length scale of few nanometres. It is revealed that the strong intermolecular interaction along one of the lattices compared to the other is at the origin of the 1D cascading effect. Harnessing cooperative switching opens possibilities for engineering the responses of molecular film to external trigger and provides opportunities to control the directionality of switching/reactions, and novel nanostructures.
Keywords: photo-induced switching; azobenzene derivatives; thermal-induced switching; molecular switches; STM and AFM