Ti₃C₂T_x MXene Nanosheet/Cellulose Nanofiber/Poly(ethylene glycol) Porous Composites for Absorption-Dominated Electromagnetic Interference Shielding

Abstract

The development of absorption-dominated electromagnetic interference shielding materials holds significant research potential, yet achieving an efficient electromagnetic shielding absorption capacity through simplified and convenient procedures remains a considerable challenge. Herein, a porous composite material prepared by poly(ethylene glycol) diacrylate (PEGDA) and pentaerythritol tetrakis(3-mercapto-propionate) (PETMP) by click chemistry is proposed, following with the loading of Ti 3 C 2 T x MXene nanosheet/cellulose nanofiber (MXene/CNF) onto the surface of the composite materials by coating. In this study, the influence of sample thickness on the absorption and reflection properties is discussed. The hypothesis deductive method proves that the sample can be analyzed according to multiple transmission line models. Benefitting from the excellent electrical conductivity of MXene/CNF with the absorptive ability of PEG porous polymers and the Salisbury screen effect, this composite material achieves an ultrahigh electromagnetic shielding effectiveness (EMI SE) of 60 dB and an absorption coefficient (A) of 92% at 34 dB with the use of less than 0.3 wt % of conductive filler, which shows a prosperous application prospect in electromagnetic interference shielding field.