Abstract
We have investigated the formation and electrical properties of nanowire bridges formedwhen nanowires modified with the biomolecule biotin span across a gap betweengold microelectrodes functionalized with the complementary biomolecule, avidin.Dielectrophoretic manipulation with a 1 MHz AC voltage is used to manipulatebiotin-modified nanowires into the inter-electrode gap. Biomolecular recognition betweenthe biotin-modified nanowires and the avidin-modified gold microelectrodes then holds thenanowires securely in place. By simultaneously applying a second, lower-frequency ACvoltage and using lock-in detection, we are able to monitor individual bridgingevents in real time and to characterize the change in electrical response associatedwith individual nanowire bridges. The combined use of physical manipulationwith biomolecular recognition can be used for selective assembly of nanoscalematerials, as well as analytical application as a biologically activated switch inwhich an electrical contact is controlled by a biomolecular recognition process.
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