ZnO nanowires were synthesized by chemical vapour deposition (CVD). The dc electrical conductivity of a single ZnO nanowire was investigated over a wide temperature range from 300 to 6 K. It is found that the temperature dependence of conductivity follows the relation . The conductivity data suggest that the dominant conduction mechanism is Efros–Shklovskii variable-range hopping conduction. The strong electron–electron interaction in the nanowire is also proved by the I–V and d I /d V curves, on which there emerges a Coulomb gap-like structure at low temperatures.
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Ma et al. (2005) studied this question.
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