Figure 1

The unit-cells of (a) pristine BNNT, (b) BN(Al), (c) BN(Ga), (d) BN(P) and (e) BN(As) optimized at PBE-PBE/6-311G* level of theory.
The unit-cells of (a) pristine BNNT, (b) BN(Al), (c) BN(Ga), (d) BN(P) and (e) BN(As) optimized at PBE-PBE/6-311G* level of theory.