Abstract
Based on first-principles theoretical calculations, we find that on pristine single-wall carbon nanotubes (SWNT’s), the dissociative adsorption of molecules is severely suppressed due to very high energy barriers of about 3 eV, while H atoms have low-energy barriers less than 0.3 eV. On Li-doped SWNT’s, the energy barriers for the dissociative adsorption of are lowered by about 0.3–0.5 eV due to the charge transfer to the tube, as compared to the pristine tube. However, these energy barriers are still too high for to be directly adsorbed, indicating that Li doping itself does not enhance significantly the H adsorption. On the other hand, LiH molecules are easily adsorbed and dissociated with no energy barrier.
- Received 21 March 2002
DOI:https://doi.org/10.1103/PhysRevB.66.073415
©2002 American Physical Society