Study on microwave absorption properties of “symmetrical pyramid-shaped” Fe3O4@Ti3C2Tx/graphite nanosheets composite materials

Two-dimensional transition metal carbides/nitrides, typically exemplified by Ti 3 C 2 T x , featuring unique two-dimensional layered architectures, intrinsic defects, and abundant surface chemical compositions, have been recognized as highly promising novel microwave absorbing materials. Nevertheless, their intrinsic single dielectric loss mechanism significantly restricts the further improvement of microwave absorption performance. Herein, a facile solvothermal approach is proposed to anchor symmetrical pyramidal Fe 3 O 4 onto the surfaces and interlayers of Ti 3 C 2 T x and graphene nanoribbons, by which impedance matching is effectively balanced. The resulting composite, denoted as Fe 3 O 4 @Ti 3 C 2 T x /GNs, is endowed with additional loss mechanisms, thereby enhancing its microwave absorption performance. At a Ti 3 C 2 T x loading of 0.5 g/L and a thickness of 4.8 mm, the sample exhibits superior microwave absorption properties, with a minimum reflection loss of −51.97 dB achieved at 5.20 GHz, an effective absorption bandwidth of 2.72 GHz, and multi-band absorption characteristics. Notably, these findings provide valuable insights into the development of MXene-based composites with ultra-wide absorption bands and the clarification of electromagnetic wave absorption mechanisms.