Berlin 2012 – scientific programme
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O: Fachverband Oberflächenphysik
O 14: Adsorption on semiconductors, oxides and insulators II
O 14.8: Talk
Monday, March 26, 2012, 17:45–18:00, MA 041
Azobenzene adsorbed on surfaces: NEXAFS study and StoBe calculations — •Michael Naboka1, Alexei Nefedov1, Christof Wöll1, Ulrich Jung2, Eric Ludwig2, Thomas Strunskus2, and Olaf Magnussen2 — 1Karlsruhe Institute of Technology — 2Christian-Albrechts-University Kiel
In recent years, molecular switches have attracted considerable attention because of the high potential application in electronic and photonic devices. The molecular switches enable the storage of information on a molecular level, and may find a numerous application in nanotechnology, and molecular electronics. The integration of molecular switches with inorganic surfaces has recently become a hot topic as it can give rise to novel hybrid materials in which the properties of the two components are mutually affected or even enhanced in a reversible fashion. One of the candidates for such a molecular switch can be azobenzene, a chemical compound composed of two phenyl rings linked by a N=N double bond. The molecule is especially interesting from the point of view of chemical isomerization. The two isomers can be switched with particular wavelengths of light: ultraviolet light, which corresponds to the energy gap of the π-π* (S2 state) transition, for trans-to-cis conversion, and blue light, which is equivalent to that of the n-π* (S1 state) transition, for cis-to-trans isomerization. We present the NEXAFS study of the TiO2 (110) surface functionalized with azobenzene and Triazatriangulenium (TATA) platform functionalized with azobenzene on Au(111) supported by theoretical simulation using StoBe package.