Figure 4From: Electrical transport properties of small diameter single-walled carbon nanotubes aligned on ST-cut quartz substratesTemperature dependence of the electrical resistance of the samples. (a) SWNT1 and (b) SWNT2. Insets show the resistance in the low temperatures range. The electrical current is 10 nA in all measurements. Natural logarithm of the resistance versus 1/T for samples (c) SWNT1 and (d) SWNT2 is shown. The solid lines are fits to a thermal activation formula R ~ exp (U/k B T), where U is an energy barrier (see text).Back to article page