Condensed Matter Seminar: "Carbon Nanotechnology"
(sign-up)Joseph Lyding, University of Illinois at Urbana-Champaign
Physics - Condensed Matter
Future electronics technologies will likely integrate non-silicon nanotechnologies with silicon and III-V semiconductor platforms. Carbon-based nanotechnologies, based on carbon nanotubes or graphene and its derivatives, represent an important class of these new hybrid systems. We are exploring the integration of carbon nanostructures with conventional semiconductors. A key challenge is the fabrication of ‘clean’ nanostructure-substrate systems. We have addressed this by developing a simple dry contact transfer (DCT) process that enables the deposition of nanostructures onto atomically clean surfaces in ultrahigh vacuum. STM imaging and spectroscopy, coupled with our atomic resolution STM-based hydrogen resist process have been used to study the interactions of carbon nanotubes, graphene and atomically precise graphene nanoribbons with silicon, GaAs and InAs substrates. In these experiments we have observed the metallic zigzag edge state in graphene, carbon nanotube-substrate lattice alignment effects and an electronic semitransparency of graphene and graphene nanoribbons. This talk will also show a method for creating sub-5nm metal wires for contacting nanostructures, a SPM probe sharpening technique for producing 1 nm radii probes, and a technique for improving the electronic performance of carbon nanotube array transistors as well as the structural and thermal performance of CNT-based composite materials.
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