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Since the graphitic carbon nitride (g-C 4 N 3 ), which can be seen as C-doped graphitic-C 3 N 4  (g-C 3 N 4 ), was reported to display ferromagnetic ground state and intrinsic half-metallicity (Du  et al .,  PRL , 108 , 197207 , 2012 ), it has attracted numerous research interest to tune the electronic structure and magnetic properties of g-C 3 N 4  due to their potential applications in spintronic devices. In this paper, we reported the experimentally achieving of high temperature ferromagnetism in metal-free ultrathin g-C 3 N 4  nanosheets by introducing of B atoms. Further, first-principles calculation results revealed that the current flow in such a system was fully spin-polarized and the magnetic moment was mainly attributed to the  p  orbital of N atoms in B doped g-C 3 N 4  monolayer, giving the theoretic evidence of the ferromagnetism and half-metallicity. Our finding provided a new perspective for B doped g-C 3 N 4  spintronic devices in future.

Atomically Thin B doped g-C3N4 Nanosheets: High-Temperature Ferromagnetism and calculated Half-Metallicity