Conductivity and Atomic Structure of Isolated Multiwalled Carbon Nanotubes

摘要

We report associated high resolution transmission electron microscopy (HRTEM)and transport measurements on a series of isolated multiwalled carbonnanotubes. HRTEM observations, by revealing relevant structural features of thetubes, shed some light on the variety of observed transport behaviors, fromsemiconducting to quasi-metallic type. Non Ohmic behavior is observed forcertain samples which exhibit "bamboo like" structural defects. The resistanceof the most conducting sample, measured down to 20 mK, exhibits a pronouncedmaximum at 0.6 K and strong positive magnetoresistance.