Abstract
The density of states (DOS) of single-walled carbon nanotubes (SWNTs) grown on a metal tip apex was investigated by scanning tunneling spectroscopy (STS). SWNTs were synthesized directly on a PtIr tip by thermal chemical vapor deposition and utilized as a scanning tunneling microscopy (STM) tip. DOS corresponding to both metallic and semiconducting SWNTs were obtained. The STS spectra displayed sharp peaks originating from van Hove singularities, which revealed the energy gap and diameter. Furthermore, the chirality of SWNTs was determined by comparing the experimental result with theoretical calculations.
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