Study On Electromagnetic Interference Shielding Performance Of Ti₃C₂T_x MXene

Nowadays,in the era of informatization and technology,the rapid development and application of electronic equipment has provided a convenient life for human beings.At the same time,electromagnetic pollution has become the fifth largest pollution after air pollution,water pollution,noise pollution and solid waste pollution.Facing the huge challenges brought by electromagnetic pollution,electromagnetic interference shielding materials have received extensive attention and become a research hotspot.Among the large number of electromagnetic shielding materials,two-dimensional(2D)MXene materials represented by Ti₃C₂T_xstand out,and are developed as potential electromagnetic shielding materials due to their unique structure and surface properties.In this work,according to the problems of how to improve the electromagnetic interference shielding effectiveness(EMI SE)of Ti₃C₂T_xand solve the high reflection of electromagnetic radiation,the EMI SE and electromagnetic wave attenuation mechanism of doped and modified materials were systematically studied to achieve efficient and green shielding.At first,the doping of Agnanoparticles was realized by the mixing of Ti₃C₂T_xand AgNO₃,and then Ti₃C₂T_x/Agcomposite films were prepared.The materials used conductive loss,dipole and interface polarization,multiple reflections and scattering to attenuate incident electromagnetic waves.Controlling the content of Agnanoparticles can meet different requirements for EMI SE.When the doping of Agnanoparticles was little,a stable shielding performance could be obtained in the band of 8.4-10.4 GHz.When more Agwas added,the shielding performance of Ti₃C₂T_xat 8.4 GHz increased sharply,among which T-Ag-15(the addition of AgNO₃was 15 mg)achieved an excellent EMI SE of 48.0 d B.In order to solve the secondary reflection due to the high conductivity of Ti₃C₂T_x.In present work,the surface modification of Ti₃C₂T_xwas achieved by annealing at different temperatures,and the Ti₃C₂T_x/TiO₂heteromaterial was constructed successfully.The absorption,reflection,transmission coefficients and EMI shielding performances in three bands of C-,X-and K_u-were tested.By adjusting the annealing temperature,the growth of TiO₂on the surface of the materials was limited,thereby adjusting the polarization loss and conductive network in the materials.Additionally,the regulation of the annealing temperature realized the tuning of the electromagnetic wave frequency bands and EMI SE.At 18 GHz,the material annealed at 600?reached a good EMI SE of 35.1 d B.Moreover,the annealing treatment improved the impedance matching of the materials,and reduced the harm caused by secondary reflection.In this paper,the EMI SE was improved and tuned by doping Agnanoparticles and surface modification,respectively.This research provides ideas for other MXene materials to achieve high-efficiency,green and tunable EMI SE.