Articles written in Pramana – Journal of Physics
Volume 90 Issue 1 January 2018 Article ID 0004 Research Article
The adsorption energies, bond order, atomic charge, optical properties, and electrostatic potential of nitrogen molecules of armchair single-walled carbon nanotubes (SWCNTs) and nitrogen-doped single-walled carbon nanotubes (N-SWCNTs) were investigated using density functional theory (DFT). Our results show that adsorption of the $N_2$ molecules on the external wall of a nanotube is more effective than on the internal wall in SWCNTs. The results show that $N_2$ molecule(s) are weakly bonded to SWCNTs and N-SWCNTs through van der Waals-type interactions. The interaction of $N_2$ molecules with SWCNTs and N-SWCNTs is physisorption as the adsorption energy and charge transfer are small, and adsorption distance is large. The electronic transitions from the highest occupied molecular orbital (HOMO) to the lowest unoccupied molecular orbital (LUMO) (H → L) have the maximum wavelength and the lowest oscillator strength. The potential sensor on the surface of pristine SWCNTs and N-SWCNTs for the adsorption of $N_2$ molecule(s) is investigated. The N-loaded single-walled carbon nanotube is introduced as a better $N_2$ molecule(s) detector when compared with SWCNTs.
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