Fabrication and Characterization of Suspended Carbon Nanotube Devices in Liquid Page: 4 of 17
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applications (Baughman et al., 2002). While the majority of the carbon nanotube
electronic devices reported in the literature consist of nanotubes grown or
deposited on the surface, it is often advantageous to have suspended nanotubes
to avoid nanotube-substrate interactions. (In the context of this paper suspended
nanotube always refers to a nanotube double-clamped to the substrate only at its
ends and hanging freely above the substrate.) The easiest and most widely used
approach to fabricate suspended nanotube devices with long (> 1 pm) suspended
regions is chemical vapor deposition (CVD) growth across preformed channels
(Franklin et al., 2002). This method produces straight suspended nanotubes 10
pm and longer. Researchers have previously synthesized carbon nanotubes
suspended over trenches and studied their mechanical and electronic properties
in air and vacuum (Cao et al., 2005, Franklin et al., 2002, Han et al., 2001, Kim et
al., 2002, Lee et al., 2004, Minot et al., 2003, Nygard and Cobden, 2001, Peng et
al., 2003, Son et al., 2004, Walters et al., 1999). However, very little information
exists about the behavior of these suspended devices in liquids. One of the main
reason why previous attempts to study suspended carbon nanotube devices in
liquid have been unsuccessful is that suspended nanotubes bridges break upon
transfer into liquid phase (Franklin et al., 2002, Nygard and Cobden, 2001).
We estimate forces acting on a suspended carbon nanotube and conclude
that it is surface tension that leads to nanotube fracture while viscosity effects
play a minor role. To circumvent this limitation we describe a method to preserve
suspended carbon nanotubes during immersion in liquid. We achieve it by
temporarily coating carbon nanotubes with an inorganic shell in the gas phase,
and subsequently removing it after the structure is transferred into liquid.
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Artyukhin, A; Stadermann, M; Stroeve, P; Bakajin, O & Noy, A. Fabrication and Characterization of Suspended Carbon Nanotube Devices in Liquid, article, October 30, 2006; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc901875/m1/4/: accessed February 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.