Scanning tunneling spectroscopy of a semiconducting heterojunction nanotube on the Au(1 1 1) surface
- Citation data:
Surface Science, ISSN: 0039-6028, Vol: 581, Issue: 2, Page: 241-245
- Publication Year:
- Repository URL:
- Physics and Astronomy; Materials Science; Carbon nanotube; Scanning tunneling microscope
The atomic and electronic structures of a single-wall carbon nanotube prepared on the Au(1 1 1) surface was studied. We performed scanning tunneling spectroscopy measurement in a semiconducting nanotube heterojunction, obtaining the local electronic density of states. An interface state was observed within the energy gaps of the semiconducting nanotubes. The interface state is spatially localized within a few nm scales and decays into the two semiconducting CNTs with unequal screening lengths. The interface state is donor-like, possibly originating from a heptagonal atomic structure. The interface state is well-understood, in analogy with that of a conventional semiconductor heterojunction.