Preparation And Properties Of Ti₃C₂T_x MXene Based Electromagnetic Shielding Materials

MXene(two-dimensional transition metal carbide,nitride,and carbonitride)has become one of the research hotspots in the field of electromagnetic interference shielding due to its large lamellar structure,excellent hydrophilic,electrical conductivity,and the surface of MXene is rich in oxygen-containing functional groups.MXene nanosheets,on the other hand,are easily stacked and oxidized,resulting in the decrease in electromagnetic shielding efficiency.MXene can be used with conductive polymer and high conductivity additives to improve the efficacy and stability of its electromagnetic shielding.This study evaluated the effects of three conductive additives(EGa In liquid metal(LM),polyaniline(PANI),and carbon nanotubes(CNTs))on the microstructure,electromagnetic shielding capabilities,mechanical characteristics,stability,and joule heating properties of Ti₃C₂T_x-based composites.A flexible,stable,and efficient EMI shielding fabric based on Ti₃C₂T_xMXene was developed.The precise research material is as follows:(1)Ti₃C₂T_x/LM composites were generated by combining Ti₃C₂T_xwith EGa In-based LM nanoparticles.By altering the Ti₃C₂T_x/LM ratio,several composite materials(TLM)were developed.The effects of different LM additions on the morphology and electromagnetic shielding capabilities of composites were investigated.Using a simple solution infiltration procedure,the treated carbon fabric(CF)was immersed in TLM conductive paste to develop an EMI shielding fabric with strong electromagnetic shielding,mechanical,and joule heating properties.When the Ti₃C₂T_x/LM ratio is 1:8(TLM-6-CF),the conductive fabric created exhibits a high electrical conductivity.The conductivity is 1714 S/m,with an EMI SE value of 50.0d B.Simultaneously,the TLM-6-CF conductive fabric exhibits good joule heating capability,with saturation temperatures of 34.7?@1 V,45.1?@2 V,and 57.6?@3 V.(2)Ti₃C₂T_x/PANI composites with 3D nanoflower structure were created by in-situ oxidation-free polymerization on Ti₃C₂T_xnanosheets.At the same time,LM nanoparticles were added to the surface of the nanoflower to increase its flexibility and conductivity.A variety of Ti₃C₂T_x/PANI/LM conductive composites(TPLM)were developed by altering the quantity of LM added.This approach addresses the problem of a poor connection between LM nanoparticles and the discontinuous conductive network of Ti₃C₂T_xMXene nanosheets.At a thickness of 0.27 mm,the TPLM-6-CF composite EMI shielding fabric has an EMI SE value of 52.0 d B and can endure 2000 bending tests without losing conductivity.The saturation temperatures of TPLM-6-CF are 29.0?@1 V,43.0?@2 V,and 56.0?@3 V,respectively.(3)CNTs were added to the TPLM-CF system to enhance the performance of composites even more.A variety of composite conductive pastes(CTPLM)were developed by adjusting the ratio of CNT and Ti₃C₂T_x.When the CNT and Ti₃C₂T_xratio was 4:1(CTPLM-5-CF),the EMI SE increased to 78.9 d B.Composite conductive textiles have saturation temperatures of 36.1?@1 V,109.5?@2 V,and 130.0?@3 V,respectively.