Andreas Stetter

Conductivity of Multiwall Carbon Nanotubes: Role of Multiple Shells and Defects

This work reports on laterally resolved measurements of the current-induced gradient in the electrochemical potential of multiwall carbon nanotubes.
Nanotubes with different classes of defects were studied at room temperature. The potential profile of the outermost shell along the tube was measured in a local as well as in a nonlocal geometry. The data have been used to separate the contributions of various shells to the total resistance of the whole tube. For this purpose, a classical resistivity model was used that describes the measured potential
profiles well. Additionally, the influence of structural defects on the conductivity has been quantified. Particularly, defects such as an ending outermost shell, an intratube junction, and a plastically stretched tube with a kink were investigated. Additionally, measurements at low temperatures revealed some quantum conductance effects, such as weak localization and oscillations in the potential profile. The latter could be traced back to the same origin as the universal conductance fluctuations.
Beigaben:12 s/w Illustrationen, 28 farb. Illustrationen
Einbandart:Broschur klebegebunden
Format:17 x 24 cm
Gewicht:246 g
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