Sensor applications and spin-transport measurements in carbon nanotube nanocomposites

ORAL

Abstract

Vertical and horizontal carbon nanotubes have been grown at USF using CVD and PECVD techniques with Ni and Fe nanoparticle catalysts. At NRL we have used CVD to produce carbon nanotube networks on SiO$_{2}$/Si$^{++}$ substrates to build sensors for chemical and bio agents by measuring capacitance and conductance. Various chemical vapors are able to be sensed with a fast response and recovery as well as a high degree of selectivity. A microfluidic flow system has been developed to extend the sensing applications to biological analytes. It is also known that carbon nanotubes are excellent transmission channels for charge and spin transport. In addition to the biosensors, we will also report on our experiments probing charge and spin transport through nanotube networks using point contact Andreev reflection (PCAR) based on superconducting and ferromagnetic junctions. Work at USF supported by DARPA/ARO through grant {\#} W911NF-05-1-0354

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Authors

  • J. Sanders

  • J. Gass

  • H. Srikanth

    Department of Physics, University of South Florida, Tampa FL 33620, Physics Department, University of South Florida, Tampa, FL 33620, USA, Functional Materials Laboratory, Physics Department, University of South Florida,, Functional Materials Lab, Dept. of Physics, University of South Florida-Tampa, 33620, USA, Functional Materials Laboratory, Physics Department, University of South Florida, Tampa, FL 33620, USA, Functional Materials Laboratory, Physics Department, University of South Florida, Tampa, FL 33620 USA

  • F.K. Perkins

  • E.S. Snow

    Nanotechnology Section, U.S. Naval Research Lab, Washington, D. C