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(a) SEM image of nanotubes. (b). High magnification SEM image showing a nanotube across two electrodes.
(a) curve of a single nanotube measured under ambient atmosphere. (b) curves of a single nanotube measured at different temperatures after annealing. The nonlinear curves show the existence of Schottky barriers. (c) curves of a single nanotube measured at different temperatures after long time annealing. (d) The temperature dependence of the dark conductivity for the nanotube in Fig. 2(c).
(a) The photocurrent versus voltage of a single nanotube measured at 50 °C. The nanotube was illuminated with a bulb through an optical fiber. (b) The temperature dependence of the photoconductivity excited under 40 W light between 40 and 200 °C.
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