Dresden 2017 – scientific programme
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O: Fachverband Oberflächenphysik
O 111: Nanostructures at Surfaces: Molecular Systems III
O 111.9: Talk
Friday, March 24, 2017, 12:30–12:45, REC/PHY C213
Imaging the electronic structure of on-surface generated acenes — •Justus Krüger1, Frank Eisenhut1, Thomas Lehmann1, José M. Alonso2, Dmitry Skidin1, Dolores Pérez2, Enrique Guitián2, Dmitry A. Ryndyk1, Christian Joachim3, Diego Peña2, Francesca Moresco1, and Gianaurelio Cuniberti1 — 1Institute for Materials Science, Max Bergmann Center of Biomaterials, and Center for Advancing Electronics Dresden, TU Dresden, 01069 Dresden — 2CIQUS and Departamento de Química Orgánica, Universidade de Santiago de Compostela. Santiago de Compostela 15782 — 3GNS & MANA Satellite, CEMES, CNRS, 29 rue J. Marvig, 31055 Toulouse Cedex
We present the fabrication of acenes (polycyclic hydrocarbons formed by the linear fusion of several benzene rings) on metallic surfaces. In particular, scanning tunneling microscopy and spectroscopy of single hexacene molecules is performed to directly visualize the frontier orbital resonances and to capture their narrow energy gap. Due to the high reactivity of hexacene under ambient conditions, scanning probe investigations at the single molecule level could not be obtained so far. In this work, we proof the scalability of a recently introduced on-surface reaction [1] to generate and stabilize hexacene directly on Au(111) by making use of oxygen-containing precursors. In the last part of this talk, we analyze the electronic resonances of long acenes on Au(111) as function of their length. [1] ACS Nano, 2016, 10 (4), pp 4538-4542