Conductance quantization in multiwalled carbon nanotubes
We present results of carbon nanotube conductance measurements. The experiments were performed using an scanning probe microscope (SPM) system where a carbon nanotube fiber is connected to the SEM tip and then lowered into a liquid mercury contact. Experiments were also performed using a modified transmission electron microscope (TEM) specimen holder supplied with piezo and micrometer positioning system. Thus the contacting process of the nanotubes 1,vith the mercury colild be ntonitorerl while simultaneously recording. the conductance, These measurements and observations confirm previously reported conductance quantization (Frank et al.: Science 280. 1744 (1998)) of the nanotubes while providing additional details concerning the mercury nanotube contacts. We also report conductance versus voltage characteristics of carbon nanotubes.
PACS85.40.−e Microelectronics: LSI, VLSI, ULSI: integrated circuit fabrication technology 61.46.+w Clusters, nanoparticles, and nanoc, rystalline materials
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