2007 NSTI Nanotechnology Conference and Trade Show - Nanotech 2007 - 10th Annual

Electronic and Magnetic Properties of SWCNT Yarns

D.S. Lashmore, M.W. Schauer, M.W. Wittmann and J.J. Brown
Nanocomp Technologies Inc., US

Keywords:
SWCNT yarns, conductivity, resistivity, spin valve, magnetoresistivity, high temperature, high frequency

Abstract:
The high rate synthesis of strong single wall carbon nanotube yarns will be described. This process involves the following steps: chemical vapor deposition of long CNTs from mixed alcohol type fuels, creation and stabilization of the catalyst, and a new type of in situ spinning process capable of producing yarns of indefinite length. Further the electronic properties of these single wall carbon nanotube yarns are presented and discussed as: (1) A function of temperature from -4 oK to1500 oC, (2) A function frequency from 0 up to about 3 GHz and (3) In a magnetic field up to 1000 Oe. It is shown that these yarns have semiconductor properties but surprisingly exhibit apparent metallic like conduction high at high frequencies. Further CNT yarns made up of more than 1015 tubes have resistivity values similar to a single tubes. Data will be present for both yarns made of single and mulitwall carbon nanotubes.

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