Ultra-Thin Broadband Terahertz Absorption and Electromagnetic Shielding Properties of Mxene/Rgo Composite Film

The rapid development of terahertz technology is accompanied by serious electromagnetic pollution, it is extremely imminent to prepare high efficiency terahertz absorbers. However, currently terahertz absorbers mostly concentrate on complex structural absorption-based metamaterials and thicker foams, how to fabricate thin, strong absorption and great EMI shielding materials has always been a big challenge in the terahertz band. In this work, an ultra-thin broadband MXene/rGO composite film (MGF) as a terahertz absorber with EMI shielding effectiveness was originally reported. The maximum RL value of 5-layer sandwich-like structure MGF is 57.7 dB at 1.4 THz with ultra-thin thickness of 0.15 mm, the qualified bandwidth covers the full measurement frequency band of 0.37–2.0 THz by designing material components and sandwich-like structure. More impressively, it shows an excellent shielding effectiveness of 54.2 dB, with a maximum absorptance of 99.999% and its average absorption intensity (AAI) reaches 43.2 dB. Furthermore, its specific maximum reflection loss, specific maximum EMI shielding effectiveness and specific effective absorption bandwidth reach up to 384.7 dB·mm -1 ,361.3 dB·mm -1 and 10.9 THz·mm -1 , respectively, which is much better than other kinds of materials studied so far. The results provide a significant inspiration for designing ultra-thin broadband THz absorption and EMI shielding materials with high property.