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The electrical contact resistance and length dependant resistance of vertically aligned carbon nanotubes (CNT) grown at 500 °C with high tube density (1011 cm-2) are investigated by measuring samples with different CNT lengths. Cross-sectional imaging revealed that the CNT tips are well embedded over a length of several hundred nm. The determined contact resistance of 18 kΩ is low, which is attributed to a combination of CNT tip embedding and tip growth mechanism. When the CNT mean free path determined by Raman spectroscopy is compared with that obtained from the electrical measurements, it shows that multiple walls are conducting in parallel per CNT.
Nanotechnology (IEEE-NANO), 2012 12th IEEE Conference on
Date of Conference: 20-23 Aug. 2012