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NASA Ames Research Center
This is an abstract for a talk to be given at the Fifth Foresight Conference on Molecular Nanotechnology.
Carbon nanotubes (CNT) can be metals or semiconductors, just depending on their diameter and helicity. We design a variety of two and three terminal junctions of metals and/or semiconductors by introducing topological defects into interface where the different tubes are joined.
We study energetics of these devices via quantum chemistry calculations. We derive topological and chemical rules to identify or design a variety of CNT devices. Some of our model heterojunctions have been observed from more recent CNTs grown by chemical vapor deposition experiments. We apply molecular dynamics simulations to study the thermal and mechnical stability of these devices.
We use quantum mechanics calculations to investigate electronic structures
and properties of some CNT devices that have been proved to be energetically
stable and chemically accessible. We calculate the density of state (DOS) and
conducdence as functions of interface composition and geometry. Based on
our systymatic studies of chemical, thermal, mechanical and electronic
properties, we discuss the fabrication and applications of the CNT electronic
devices as transistors, resonant tunneling diodes, electro-mechanical
devices and chemical-electrical-mechanical devices.
Dr. Jie Han, NASA Ames Research Center, Moffett Field, CA 94035, ph: 415-604-4799 fax: 415-604-3957 email: firstname.lastname@example.org
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