Molecular wires of zinc octaethylporphyrins and bipyridines prepared at the tetradecane/HOPG interface
Molecular wires of zinc octaethylporphyrins and bipyridines prepared at the tetradecane/HOPG interface, Proc International SPM usermeeting, Les Ulis, France, Vol. nd, pp. nd - nd, May, 2011.
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The stepwise preparation of supramolecular structures offers the possibility to combine molecules, in a well-defined sequence, to fabricate molecular wires and molecular rectifiers for nanoelectronics applications.[1,2] However, the control of the growth process is needed, to ensure the formation of the intended structure. One of the most used techniques to control the molecular self-organization on a substrate is the scanning tunnelling microscopy (STM) at the liquid/solid interface.
We have been studying the preparation and characterisation of self-assembled molecular wires with zinc (II) octaethylporphyrin (ZnOEP) bridged by bipyridine (BP) on highly oriented pyrolitic graphite (HOPG). We used STM at tetradecane/HOPG interface to control the ZnOEP adsorption and at the same time to obtain the corresponding I/V characteristics. The results showed that the molecular organization is independent of the MW length, aside defects whose presence increases with the number of growth steps.
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