Three-terminal, single molecule circuits based on carbon nanotube interconnects
B.R. Goldsmith, J.G. Coroneus, V.R. Khalap, A.A. Kane, G.A. Weiss and P.G. Collins
University of California, Irvine, US
nanotube biosensor functionalization
The vision for molecular electronics extends well beyond minitaturation and scaling and includes new techniques for studying chemical bonding, biocatalysis, and molecular recognition. However, working single-molecule devices remain exceedingly difficult to fabricate. We demonstrate a new architecture for studying single-molecule behavior which relies on point functionalization of single-walled carbon nanotube circuits. The technique is free of precision lithography and mechanical manipulation. Instead, it uses nanotube conductance to reveal chemical processes happening in real-time and to deterministically control oxidation, reduction, and conjugation to target species. We routinely functionalize pristine, defect-free SWNTs at one, two, or more sites and demonstrate three-terminal devices in which a single biomolecular attachment controls the electronic response. Compared to other fabrication techniques for molecular electronics, this method produces devices with excellent electrical, mechanical, and chemical stabilities and well-defined bonding to the molecule of interest.
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Nanotech 2007 Conference Program Abstract