Enhanced room-temperature ferromagnetic properties in ultrathin two-dimensional metal-free poly(triazine imide) nanosheets

Two-dimensional poly(triazine imide) nanosheets have attracted increasing attention due to the diverse functionalities, however, it remains a challenge to synthesize poly(triazine imide) nanosheets directly from molecular monomers. Here, a novel bottom-up ionothermal method of high efficiency was developed for the synthesis of ultrathin amorphous poly(triazine imide) (aPTI) nanosheets from molecular monomers in molten salt. Intriguingly, the aPTI nanosheets exhibit significantly enhanced intrinsic room temperature ferromagnetic behavior in comparison with that of the bulk aPTI material. This work paves a new pathway to synthesize 2D nanomaterial systems with intrinsic ferromagnetic properties, which would have great potential applications in future spintronic devices and other related fields.

From monomer to nanosheets: Herein, an ionothermal method for low cost and large-scale synthesis of ultrathin amorphous poly(triazine imide) nanosheets from condensation of dicyandiamide in molten chlorides of LiCl/KCl is demonstrated. The amorphous poly(triazine imide) nanosheets exhibit obvious intrinsic room temperature ferromagnetic behavior, and hold potential applications in future spintronic devices.67