Magnetic Investigation on the Two-Dimensional Metallated Graphdiyne Nanosheets

Graphdiyne, being considered as a new potential spintronics material, possesses excellent electronic and magnetic properties. However, how to introduce ferromagnetic order into graphdiyne is still a pending issue not yet solved, which limits its further application. In this paper, transition metal cobalt is introduced into the alkynyl unit of graphdiyne by a bottom-up liquid-liquid interface synthesis method and the obtained cobalt-doped graphdiyne nanosheets are found to exhibit obvious room temperature ferromagnetism. The density function theory results show that cobalt-doped graphdiyne is half-metallic with a kagome lattice and the imbedded cobalt atoms are the source of magnetic moment. The special kagome structure presents flat band ferromagnetism, which consists with the magnetism behaviour observed in experiment. The successful synthesis of cobalt-doped graphdiyne can not only promote the magnetic investigation of graphdiyne, but provide a new route for the experimental synthesis of kagome lattice materials as well.