Dresden 2017 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 22: Poster session I
MM 22.38: Poster
Montag, 20. März 2017, 19:00–20:00, P4
Investigation of molecular orientation in individual metal-organic nanowire by polarized raman spectroscopy and simulation — •Yanlong Xing1, Eugen Speiser1, Dheeraj Kumar Singh2, Petra Dittrich3, and Norbert Esser1 — 1Leibniz-Institut für Analytische Wissenschaften, ISAS e.V., 12489 Berlin, Germany — 2Department of Chemical Physics, Jacobs University, 28759 Bremen, Germany — 3Department of Biosystems Science and Engineering, ETH Zürich, 8093 Zürich, Switzerland
To study the molecular self-organization in conductive metal-organic nanowire, single gold-tetrathiafulvalene (Au-TTF)nanowires were analysed using non-destructive polarized Raman spectroscopy at room temperature. A first investigation was done for neutral tetrathiafulvalene (TTF) crystal. Based on the density functional theory calculation of molecular Raman tensor and simulation of depolarization ratio, the orient of TTF molecules in a single TTF crystal was revealed. The high correlation between the results from this work and that of reported work proved the efficiency of the proposed method in this work. Afterwards, both the experimental and simulation method for TTF crystal was applied to study a single Au-TTF nanowire. It was indicated that there were at least two different molecule configurations in the wire, both tilted with respected to the long axis of the wire. The 3D model of sing Au-TTF wire showed a vivid image of molecular configurations in the wire. Compared to the proposed mechanism in reported work, this improved model can better explain the growth mechanism of Au-TTF wires with various morphologies.