Ultrathin MXene/Polymer Coatings with an Alternating Structure on Fabrics for Enhanced Electromagnetic Interference Shielding and Fire-Resistant Protective Performances

Abstract

Wearable electromagnetic interference (EMI) shielding fabrics are highly desirable with the rapid development of electronic devices and wireless communications where electromagnetic pollution is a great concern for human health and the reliability of precision equipment. The balance between EMI shielding efficiency (SE) and the flexibility of fabric is still challenging because of the generally opposite requirements for coating thickness. In this work, MXene/insulative polymer coating with an alternating structure is fabricated via a stepwise assembly technique to judiciously combine excellent shielding elements, a reasonable structure, and high nanofiller content together in the coating. Owing to this novel strategy, the coating with nanoscale thickness (∼500 nm) has realized the commercial requirement for EMI SE and well retained the flexibility and air permeability of the fabric. Compared with the corresponding pure MXene coating, such multilayered coating demonstrates 138.95% enhancement of EMI SE due to the improved dielectrical properties and intensive multiple reflections of electromagnetic waves. Additionally, this hybrid coating also acts as an excellent fire-resistant barrier for the inner flammable fabric to protect human beings and electronic devices in case of accidental fire. This work provides new insights into the rational design of shields with nanometer thickness to realize high EMI shielding performance and good fire resistance for newgeneration portable and wearable EMI shielding products.

Functional Polyaniline/MXene/Cotton Fabrics with Acid/Alkali-Responsive and Tunable Electromagnetic Interference Shielding Performances

“…Because the electromagnetic interference (EMI) and radiation pollution derived from various modern communication and electronic devices severely endanger the reliability of precision equipment, information security, and even human health, , high-performance EMI shielding materials and composites are highly required. − Over the past decade, numerous attempts have been devoted to design and fabricate multifunctional EMI shielding fabrics for shielding electromagnetic wave interference and radiation. − To date, various electrically conductive nanomaterials are decorated onto the flexible fabric substrates for EMI shielding by spray coating, dip coating, drop casting, electroless plating, vacuum filtration, and combination of spray coating with vacuum-assisted filtration . The conductive materials used include metallic nanomaterials (Ag, Ni), , carbon nanomaterials (carbon nanotube, reduced graphene oxide), , intrinsic conducting polymers (polypyrrole (PPy), polyaniline (PANI)), , and liquid metals .…”

Multi-interface Assembled N-Doped MXene/HCFG/AgNW Films for Wearable Electromagnetic Shielding Devices with Multimodal Energy Conversion and Healthcare Monitoring Performances

“…The EMI shielding performance of conductive materials has a close positive correlation with their electrical conductivity. − Because of their outstanding electrical conductivity, alternating-layered LMHA films display good prospects in the application of high-performance EMI shielding. Figure S16.…”

Oxidation-Resistant MXene-Based Melamine Foam with Ultralow-Percolation Thresholds for Electromagnetic-Infrared Compatible Shielding

“…Moreover, the color change of the MFMXP under intense electromagnetic radiation can be visualized by an infrared thermal imager to see the effect of the absorbed electromagnetic wave energy converting into Joule heat. 54 Therefore, the MFMXP-9 was radiated with enhanced electromagnetic waves with the power density of 100 mW•cm −2 for 120 s. The average temperature of the surface was recorded by IR thermal imager. As shown in Figure 3e, when the radiation starts, the strong interaction between the MXene and the electromagnetic waves causes a rapid increase in temperature on the surface.…”