We investigate the growth of B-doped carbon nanotubes combining experimental and theoretical techniques. Electron microscopy observations and electron diffraction patterns reveal that B doping considerably increases the length of carbon tubes and leads to a remarkable preferred zigzag chirality. These findings are corroborated by first-principles static and dynamical simulations which indicate that in the zigzag geometry, B atoms act as a surfactant during growth, preventing tube closure. This mechanism does not extend to armchair tubes, suggesting a helicity selection during growth.
|Original language||English (US)|
|Number of pages||4|
|Journal||Physical review letters|
|State||Published - Dec 13 1999|
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)