▎ 摘　　要

A facile hydrothermal strategy to fabricate two-dimensional (2D) functional alpha-Fe2O3 nanocrystals/ reduced graphene oxide (RGO) nanocomposite is proposed by only using graphene oxide (GO) sheets and FeCl3 as precursors through a green and controllable reaction process. The asprepared alpha-Fe2O3 nanocrystals with a size of about 60 nm can be in-situ formed and uniformly distributed over the surface of the RGO sheet, which effectively prevent the RGO sheets from the pi-pi stacking. Interestingly, the resulting 2D functional nanocomposites exhibit much better electromagnetic absorption property compared with other magnetic absorbing materials, due to their special structure, and their synergetic effects of well dispersed platelet-shaped alpha-Fe2O3 nanocrystals and no stack RGO sheets. The minimal reflection loss is up to -61.0 dB at 12.0 GHz for the resulting nanocomposites with a coating thickness of only 2.5 mm. This result indicated that the developed nanocomposites could be a promising functional material for applications in the electromagnetic wave absorbing field with lightweight and facile subsequent coating process.