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(Color) MWNT device and its transfer characteristics. (a) SEM image of MWNT device. electrodes were deposited on the MWNT (metal-on-tube configuration). and were applied from the electrodes and from the backgate electrode, respectively. (b) plots for the sample measured at . The red and blue lines were recorded at 300 and , respectively. The increased from 1.5 at to 8.7 at .
(Color) Plots of conductance against gate voltage and temperature. (a) The plot with ranging from at at each temperature from . Warm colors represent higher temperatures and cold colors represent reduced temperatures. Because hysteresis is ascribed to the extrinsic effect of the impurity charge near the surface of the insulator, the data for the leftward scan were shifted such that , which corresponds to the charge neutrality point, was at . (b) curves on a double logarithmic scale at , 5, 10, and (-type region, denoted by red circles) and , , and (-type region, denoted by blue circles). At and , was proportional to . At and , became almost temperature independent, meaning that was approximately zero. In the region, showed similar behavior to that in the case of positive gate voltage. The lines were linear fits for each .
(Color) Relationship between the exponent and the gate voltage . The values were estimated from the slope of plots. Error bars indicate standard deviations of the fit. The value was found to decrease with increasing on both positive and negative sides.
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