for more details, see

J. Lawrence, A. Berdonces-Layunta, Sh. Edalatmanesh, J. Castro-Esteban, T. Wang, A. Jimenez-Martin, B. de la Torre, R. Castrillo-Bodero, P. Angulo-Portugal, M.S.G. Mohammed, A. Matěj, M. Vilas-Varela, F. Schiller, M. Corso, P. Jelinek, D. Peña, D.G. de Oteyza
Circumventing the stability problems of graphene nanoribbon zigzag edges
Nat. Chem. 14 (2022) 1451 - 1458 .