Substrate-Independent Ti₃C₂T_xMXene Waterborne Paint for Terahertz Absorption and Shielding

Abstract

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

Controllable Surface-Grafted MXene Inks for Electromagnetic Wave Modulation and Infrared Anti-Counterfeiting Applications

“…Another challenging issue is the poor rheological property of pure MXene dispersions owing to the weak interlayer interactions. − Largely, it determines the printing technique and the quality of printed patterns . It is also the reason that the spray coating is more adopted to process pure MXene inks, and other techniques that require high ink viscosity, such as screen-printing, extrusion-printing, and blade- coating, are seldom reported. , The surface terminations, flake size, solid content, and solvent influence the rheological properties. , Large MXene flakes can provide suitable ink viscoelasticity for blade coating. ,, Also, various thickening agents, such as boehmite (AlOOH) and silicon nanoparticles, , cellulose nanofibril, , and waterborne polyurethane, , are used for rheology modulation. Then, the introduced species largely determine the chemical stability and rheological properties of MXene inks. ,− To summarize, although great progress has been made in improving either antioxidant or rheological properties, in-depth research is still necessary to modulate the comprehensive properties of MXene ink and to exploit its huge potential for versatile applications.…”

“…27,29 Large MXene flakes can provide suitable ink viscoelasticity for blade coating. 26,29,30 Also, various thickening agents, such as boehmite (AlOOH) and silicon nanoparticles, 9,31 cellulose nanofibril, 32,33 and waterborne polyurethane, 34,35 are used for rheology modulation. Then, the introduced species largely determine the chemical stability and rheological properties of MXene inks.…”

Active and Smart Terahertz Electro-Optic Modulator Based on VO2 Structure

“…The terahertz (THz) technology, for its promising applications in the fields of imaging, communication, medicine, and security, has attracted considerable attention recently. These applications drive urgent needs for THz devices such as modulators, − lenses, polarizers, and absorbers. , Among them, THz modulators play an important role in THz imaging and next-generation wireless communication systems. Aiming at different application aspects, many attempts have been performed over the past decades to develop not only transmission but also reflection modulators, and not only passive but also active ones .…”

Flexible composites by ionic liquid/silver/graphene in towel‐gourd sponge fibers: Synergistic effect and dual‐band electromagnetic interference shielding in X‐band and terahertz‐band

“…Recently, terahertz band (THz‐band) (from 0.1 to 10 THz) that allows faster rate in satellites communication has received with much concern since it contains the sixth‐generation communication (known as 6G) frequent bands. The growth for 6G technology transfigures mobile communication and information acquisition, however the more production of high‐frequent microwave pollutions causes the EMI challenge more and more severe 18 . As far as we know, few researches have broadcasted the fabrication of flexible polymer composites with application in dual‐band EMI SE in X‐band and THz‐band.…”

“…The growth for 6G technology transfigures mobile communication and information acquisition, however the more production of high-frequent microwave pollutions causes the EMI challenge more and more severe. 18 As far as we know, few researches have broadcasted the fabrication of flexible polymer composites with application in dual-band EMI SE in X-band and THz-band.…”