Scanning Tunneling Microscopy and Spectroscopy of Carbon Nanotubes
Scanning tunneling microscopy (STM) and spectroscopy have been used to obtain images and current-voltage (I–V) curves of carbon nanotubes. The nanotubes are 5–7 nm in diameter and up to 1 in length. The I–V curves indicate that carbon nanotubes with diameters of approximately 5.0 nm are metallic. This observation is consistent with recent theoretical predictions concerning the electronic structure of carbon nanotubes in relation to their diameter and helicity. Using STM, we also observe graphene sheets in the carbon soot that is produced during the arc discharge. The STM images of nanotubes are in good agreement with transmission electron microscopy images. Potential applications of carbon nanotubes include novel nanometer-size electronic devices and fiber-reinforced materials.
KeywordsCarbon Nanotubes Scanning Tunneling Microscopy Tunneling Current Scanning Tunneling Microscopy Image Carbon Soot
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