Effects of Finite Carbon Nanotube Length on Sidewall Addition of Fluorine Atom and Methylene

Density functional computations (PBE and B3LYP) in conjunction with 3-21G and 6-31G* basis sets are used to determine the energy of fluorine atom and CH₂ addition to the sidewall of (5,5) C_30+10nH₂₀ (n = 0, 1, 2...18) carbon nanotube slabs. A pronounced oscillation of the addition energy is found for fluorine atom addition, while oscillations are significantly damped for carbene addition due to the insertion into CC bonds.