Title: Fabrication and characterisation of suspended carbon nanotube devices in liquid

Authors: Aleksandr Noy, Michael Stadermann, Pieter Stroeve, Olgica Bakajin, Alexander B. Artyukhin

Addresses: Chemistry, Materials, and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, CA 94550, USA. ' Chemistry, Materials, and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, CA 94550, USA. ' Department of Chemical Engineering and Materials Science, University of California Davis, Davis, CA 95616, USA. ' Chemistry, Materials, and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, CA 94550, USA. ' Chemistry, Materials, and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, CA 94550, USA

Abstract: Suspended carbon nanotube devices represent a promising platform for future bio-electronic applications. Suspended carbon nanotube transistors have been previously fabricated in air; however all previous attempts to bring them into liquid failed. We analyse forces acting on the suspended nanotube devices during immersion into liquids and during device operation and show that surface tension forces acting on the suspended nanotubes during transfer into the liquid phase are responsible for the nanotube damage. We have developed a new strategy that circumvents these limitations by coating suspended nanotubes with a rigid inorganic shell in the gas phase. The coating reinforces the nanotubes and allows them to survive transfer through the interface. Subsequent removal of the coating in the solution phase restores pristine suspended nanotubes. We demonstrate that devices fabricated using this technique preserve their original electrical characteristics.

Keywords: carbon nanotubes; suspended nanotubes; nanotube transistors; immersion in fluids; liquids; nanotube fabrication; nanosensors; nanotechnology; bioelectronics.

DOI: 10.1504/IJNT.2008.017449

International Journal of Nanotechnology, 2008 Vol.5 No.4/5, pp.488 - 496

Available online: 07 Mar 2008 *

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