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(a) SEM images of regular microcoiled carbon fibers. (b) Tip part of a single microcoiled carbon fiber with a Ni seed as a catalyst.
(a) Temperature-dependent resistance of the measured microcoiled carbon fiber. The resistance was measured by a four-terminal technique between the temperatures of 2 and , and the inset shows ln-ln plots of the resistance as a function of the temperature . (b) vs for the fiber from . (c) vs from .
Measurement current (a) and the (b) of the fiber as a function of for different temperatures.
Magnetoresistances (MRs) of the fiber at 4, 10, 20, and , plotted as (a) and (b) .
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