Abstract

The electronic and band structure for (14, 0) single wall carbon nanotube (SWCNT) with the HCl molecule and H 2 molecule inside are investigated by using a first-principles method with the pseudopotential density functional theory (DFT). The calculated density of states and band structures can elucidate the differences for the behavior of HCl and H 2 inside SWCNT. The HCl molecule has a binding energy about −0.24 eV when it is put inside a (14, 0) SWCNT. Compared to HCl molecule, H 2 did not induce any obvious change in the band structure and electronic property. A direct band gap 0.71 eV is obtained with HCl molecule inside (14, 0) CNT, which is larger than the value for pure CNT and with H 2 molecule inside (14, 0) SWCNT.

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