Robust MXene Nanosheet-Based Electromagnetic Interference Shielding Membrane with Cation–π Interactions

Abstract

Electromagnetic interference (EMI) shielding is vital for electronic device reliability and combating electromagnetic wave (EMW) pollution. In this research, we employed a vacuumassisted filtration method to fabricate MXene membranes and achieved the construction of robust PAA/MXene hybrid membranes by incorporating a polyamic acid (PAA) adhesive containing imidazole rings through cation−π interactions. The integration of PAA led to a reduction in internal pores and the thickness of the MXene membrane, mainly attributed to the reinforcing cation−π interactions that enhance the interlayer forces among the MXene nanosheets. This integration substantially enhances the tensile strength of MXene membranes and concurrently induces alterations in their fracture behavior. Adding a small amount of PAA greatly increased conductivity in the PAA/MXene hybrid membrane, but excessive amounts resulted in a severe decline. When PAA content remained below 2 wt % of MXene nanosheets, the EMI SE T of the PAA/MXene hybrid membrane exhibited minimal fluctuations, consistently exceeding 60 dB. The EMI shielding mechanism of the PAA/MXene hybrid membrane primarily relied on reflection, with reflected electromagnetic waves accounting for over 60% of the incident EMWs. The utilization of cation−π interactions in this approach significantly enhances the interface of MXene nanosheets, thereby holding immense potential for the advanced modification of MXene materials.

Inkjet-Printing Ti3C2Tx MXene Nanosheet-Based Metamaterials for Terahertz Absorption

“…MXene, an excellent two-dimensional nanomaterial, is widely used in electromagnetic shielding, showing its excellent electrical properties in GHz and THz. − It also has a wide range of applications in the field of optoelectronics, including flexible electrodes, photoelectric storage, heterojunction, etc. In addition, MXene is easily dispersed in water; therefore, MXene-based inks do not require complex organic solvents.…”