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(a) Image of a CNT wire partially drawn through a tungsten carbide drawing die. The radial step size change between drawing dies employed is equal to 0.033 mm as illustrated by the schematics for a (b) LD CNT wire at the beginning of the drawing die process, and (d) HD CNT wire at the end of the drawing die process. The arrows in (b) and (d) represent the direction of wire drawing. Scanning electron micrographs of the CNT wire surfaces for the (c) LD wire and (e) HD wire are shown indicating a diameter of and , respectively.
Room temperature electrical conductivities of CNT wires as a function of densification. The impact of drawing lubricant is highlighted by the shift in conductivities at equivalent densities for CNT wires drawn with water (◼) compared to an aqueous solution (●); the linear trends are displayed as dashed lines.
Temperature-dependent electrical conductivity for representative samples of doped and undoped CNT wires at different levels of densification (uncertainty in measured values is within the data points). Plot inset shows experimental set-up with CNT wire segment in contact with probe tips while mounted on plate.
Conduction mechanism modeling parameters.
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