Substrate-Independent\nTi₃C₂T_<i>x</i> MXene Waterborne\nPaint for Terahertz Absorption\nand Shielding

Abstract

With\nthe development of terahertz (THz) technology, there is a\nbooming demand of THz shielding/absorption materials to avoid electromagnetic\ninterference (EMI) or pollution. Paints that can be fast solidified\nto form a film and stably adherent on arbitrary substrates are especially\ndesired for the shielding/absorption applications. Recently, MXenes\nwith high electron conductivity and hydrophilicity have attracted\na great interest for EMI shielding. Here, we demonstrate a copolymer-polyacrylic\nlatex (PAL) based MXene waterborne paint (MWP), which not only has\nstrong THz EMI shielding/absorption efficiency but also can easily\nadhere onto various substrates that are commonly used in the THz band.\nThe viscosity of MWP can be tuned by adjusting the colloidal and viscous\nforces, and the cyano group in PAL provides a strong intermolecular\npolar interaction between MWP and the substrate. As a result, a 38.3-μm-thick\nMWP on quartz exhibits EMI shielding value of 64.9 dB, and an excellent\nreflection-loss of 32.8 dB is obtained on MWP coated sponge foam.\nThis substrate-independent MWP provides a simple and efficient way\nto achieving high-performance THz shielding/absorption.