Berlin 2024 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 6: Organic Molecules on Inorganic Substrates I: Adsorption & Growth
O 6.6: Vortrag
Montag, 18. März 2024, 11:45–12:00, MA 042
Selectivity in photo- and thermal-induced trans-cis isomerization in the ultra-thin film of azobenzene derivatives on graphite — •Hariom Birla1, Showkat H Mir2, Thomas Halbritter3, Alexander Heckel4, Jayant K. Singh5, and Thiruvancheril G. Gopakumar6 — 1Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur, UP-208016, India — 2Department of Chemical Engineering, Indian Institute of Technology Kanpur, Kanpur, UP-208016, India — 3Eurofins Genomics Germany GmbH, Anzinger Str. 7a, 85560, Ebersberg, Germany — 4Institute for Organic Chemistry and Chemical Biology, Goethe-University Frankfurt, Max-von-Laue-Str.9, 60438 Frankfurt, Germany — 5Department of Chemical Engineering, Indian Institute of Technology Kanpur, Kanpur, UP-208016, India — 6Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur, UP-208016, India
Azobenzene (AB) and its derivatives are known for isomerization between its geometrical isomers using light, temperature, electrons/holes, and electrical field on surfaces. The derivatives of AB could be used as an electronic switch as there is a significant change in the electronic properties upon isomerization (trans-cis). In this work, we show the trans-cis isomerization in the ultra-thin films of azobenzene derivatives on a highly oriented pyrolytic graphite (HOPG)-air interface. The microscopic structure and the on-surface isomerization are investigated using atomic force microscopy (AFM). The trans-to-cis isomerization is induced by a photon of wavelength 360 nm whereas the cis-to-trans isomerization is induced by thermal excitation.
Keywords: azobenzne; atomic force microscopy; molecular switch; adsorption; thin film