Boron-doped graphene
Relaxed structure of boron-doped "armchair" graphene, where the vertical y–direction corresponds to the periodic direction of the system. This structure is characterized by an alternating chain of B7 clusters (shown in dark) along the y direction, separated by a carbon honeycomb. The relaxed structure of boron-doped graphene looks rather similar, but it is periodic in both the horizontal (x) and the vertical (y) directions. Credit: arxiv.org/abs/0802.3195