  The temperature dependence of the electrical transport of a individual tin
oxide nanobelt was measured, in darkness, from 400 to 5K. We found four
intrinsic electrical transport mechanisms through the nanobelt. It starts with
Thermal-Activation Conduction between 400 and 314K, Nearest-Neighbor Hopping
conduction between 268 and 115K, and Variable Range Hopping conduction below
58K, with a crossover from the 3D-Mott to the 3D-Efros-Shklovskii regime at
16K. We claim that this sequence reveal the three-dimensional nature of the
electrical transport in the SnO2 nanobelts, even they are expected to behave as
one-dimensional systems.
