Individual Biomolecules via Break Junctions
Metallic break junctions with tunable nanogaps provide a new approach to investigate the electron transfer mechanism of biomolecule-nanoelectrode hybrid systems. By breaking a metallic wire, two opposing nanoelctrodes can be generated that are later used as source and drain electrode. Break junctions have the advantage that one can tune the distance between the nanoelectrodes to the size of a single molecule with sub Ångstrom accuracy. We are attaching model proteins or functional units to the nanoelectrode through linker molecules and study the electron transfer in the bio-inorganic junctions. Our goal is to identify charge transport pathways in biomolecules and to determine the dominating charge transport mechanism.