Abstract
Molecular-scale devices can be made using a step-by-step procedure, in acontrollable and highly versatile way. In this report, we describe the growth ofmolecular wires (MW) from zinc (II) octaethylporphyrin (ZnOEP) assembled onhighly oriented pyrolytic graphite (HOPG) by a step-by-step approach using4, 4′-bipyridine (BP) to bridge the porphyrin units, via coordination of the nitrogen atomto zinc. In order to gain an insight into the molecular self-organization of thesewires, we carried out a detailed scanning tunnelling microscopy (STM) analysisof each monolayer, using a solid/liquid interface technique, up to a completeZnOEP/BP/ZnOEP/BP/ZnOEP-assembled structure. The electrical properties of theMWs were assessed by scanning tunnelling spectroscopy (STS) and by current-sensingatomic force microscopy (CS-AFM), showing an increase of electrical resistance with thelength of the MW.
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