Preparation and EMI shielding properties of three-dimensional hollow MXene-rGO-CNT composites

With the continuous development of science and technology, "strong absorption, broadband, lightweight" electromagnetic interference shielding materials need to be developed. In this paper, three-dimensional hollow MXene-reduced graphene oxide (rGO)-carbon nanotube (MXene-rGO-CNT) composites were prepared by a sacrificial template method using polymethyl methacrylate (PMMA) microspheres and ice templates, and material morphology, structure and electromagnetic interference shielding properties of the composites were characterized. The results show that the construction of rich microporous structure reduces the agglomeration of MXene flakes and the density of the composites (below 0.26 g/cm³). Meanwhile, the interconnected porous structure can cause multiple reflections and scattering of electromagnetic waves, enhancing the electromagnetic interference shielding performance of the composite material. The MXene-rGO-CNT composites exhibit good electromagnetic interference shielding performance over a wide frequency range measured from 1~18 GHz, with a high electromagnetic interference shielding effectiveness of 54 dB at peak value. This work provides a convenient method for preparing nanocomposites for efficient electromagnetic interference shielding applications.