In Situ Band Gap Engineering of Carbon Nanotubes

TLDR: Bond rotation defects close the gap in large-gap nanotubes, open the gap of small-gap Nanotubes and increase the density of states in metallic nanite as discussed by the authors.

Abstract: Bond rotation defects close the gap in large-gap nanotubes, open the gap in small-gap nanotubes, and increase the density of states in metallic nanotubes. Not only are these defects likely to be present in as-grown nanotubes, but they could be introduced locally into intact nanotubes, thereby opening a new road towards device applications. {copyright} {ital 1997} {ital The American Physical Society}