Berlin 2012 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 6: Poster: Structural Ordering and Electronic Transport (joint focus with HL)
CPP 6.9: Poster
Montag, 26. März 2012, 17:30–19:30, Poster A
Charge transport investigation in electrochemical environment — •Zhiwei Yi2, Bastian Kopp2, Dirk Mayer1, Andreas Offenhäusser1, and Elke Scheer2 — 1Research Center Jülich, 52425 Jülich, Germany. — 2Department of Physics, University of Konstanz, 78457 Konstanz, Germany
Here, an electrochemical mechanical break junction setup is introduced, which combines electrodeposition techniques and mechanical breaking techniques. Using such setup, the charge transport through electrostatically assembled molecular junctions of Au/cysteamine/1,1-ferrocene dicarboxylic acid (FDA)/ cysteamine/Au was measured in liquid. The conductance across those single-molecule junctions (0.34 x 10−4 G0) is one order of magnitude smaller than the conductance of covalently linked ferrocene molecular junctions (3.4 x 10−4 G0), which indicates that the electrostatic coupling is strong enough to form an electron transport pathway, but the electron transfer rate across electrostatic interfaces is lower than across the covalent bonds. Molecular monolayers assembled on Au surface and Au/molecule/Au junctions are often used to investigate the influence of light on the electron transport across molecules. However, the influence of light on the charge transport at the liquid/metal interface has not been investigated yet. Here, using an indium tin oxide (ITO) electrode with gold nanoparticles on top as the working electrode, light induced signals were observed when performing cyclic voltammetry. We discuss voltage and wave-length dependence of the light-induced signals and first results obtained for photochromic molecules assembled with this technique.