Ti₃C₂T_<i>x</i> MXene Nanosheet/Cellulose Nanofiber/Poly(ethylene glycol)\nPorous Composites for Absorption-Dominated Electromagnetic Interference\nShielding

Abstract

The development of absorption-dominated electromagnetic interference\nshielding materials holds significant research potential, yet achieving\nan efficient electromagnetic shielding absorption capacity through\nsimplified and convenient procedures remains a considerable challenge.\nHerein, a porous composite material prepared by poly(ethylene glycol)\ndiacrylate (PEGDA) and pentaerythritol tetrakis(3-mercapto-propionate)\n(PETMP) by click chemistry is proposed, following with the loading\nof Ti₃C₂T_<i>x</i> MXene\nnanosheet/cellulose nanofiber (MXene/CNF) onto the surface of the\ncomposite materials by coating. In this study, the influence of sample\nthickness on the absorption and reflection properties is discussed.\nThe hypothesis deductive method proves that the sample can be analyzed\naccording to multiple transmission line models. Benefitting from the\nexcellent electrical conductivity of MXene/CNF with the absorptive\nability of PEG porous polymers and the Salisbury screen effect, this\ncomposite material achieves an ultrahigh electromagnetic shielding\neffectiveness (EMI SE) of 60 dB and an absorption coefficient (<i>A</i>) of 92% at 34 dB with the use of less than 0.3 wt % of\nconductive filler, which shows a prosperous application prospect in\nelectromagnetic interference shielding field.