Ultra‐Broadband Strong Electromagnetic Interference Shielding with Ferromagnetic Graphene Quartz Fabric

Abstract

Flexible electromagnetic interference (EMI) shielding materials with ultrahigh shielding effectiveness (SE) are highly desirable for high‐speed electronic devices to attenuate radiated emissions. For hindering interference of their internal or external EMI fields, however, a metallic enclosure suffers from relatively low SE, band‐limited anti‐EMI responses, poor corrosion resistance, and non‐adaptability to the complex geometry of a given circuit. Here, a broadband, strong EMI shielding response fabric is demonstrated based on a highly structured ferromagnetic graphene quartz fiber (FGQF) via a modulation‐doped chemical vapor deposition (CVD) growth process. The precise control of the graphitic N‐doping configuration endows graphene coatings on specifically designable quartz fabric weave with both high conductivity (3906 S cm−1) and high magnetic responsiveness (a saturation magnetization of ≈0.14 emu g−1 under 300 K), thus attaining synergistic effect of EMI shielding and electromagnetic wave (EMW) absorption for broadband anti‐EMI technology. The large‐scale durable FGQF exhibits extraordinary EMI SE of ≈107 dB over a broadband frequency (1–18 GHz), by configuring ≈20 nm‐thick graphene coatings on a millimeter‐thick quartz fabric. This work enables the potential for development of an industrial‐scale, flexible, lightweight, durable, and ultra‐broadband strong shielding material in advanced applications of flexible anti‐electronic reconnaissance, antiradiation, and stealthy technologies.

Biomimetic Porous MXene Sediment-Based Hydrogel for High-Performance and Multifunctional Electromagnetic Interference Shielding

“…The advancement of gigahertz (GHz) band communication technologies has significantly brought convenience for humans, while it also leads to hazardous electromagnetic interference (EMI) or radiation. − To this end, high-performance, easy-manufacturing, adjustable-performance, and low-cost EMI shields are urgently desired. , Since introducing micrometer-sized pores in EMI shields can facilitate multiple reflections of incident electromagnetic waves (EMWs) and effectively improve the EMI shielding effectiveness (SE), recently cellular foams/aerogels have attracted more and more attention for preparing high-performance EMI shields. − However, compared with the bulk shields, the foam/aerogel-based shields generally suffer from fragility as well as poor flexibility . This limits the development of high-performance EMI shields demanding good mechanical toughness, flexibility, and even stretchability, which are especially desired for next-generation flexible devices.…”

“…7−10 However, compared with the bulk shields, the foam/aerogel-based shields generally suffer from fragility as well as poor flexibility. 11 This limits the development of high-performance EMI shields demanding good mechanical toughness, flexibility, and even stretchability, which are especially desired for nextgeneration flexible devices. The hydrogels, composed of a cellular structure filled with plenty of water and a network of cross-linking hydrophilic building blocks, can reveal satisfactory mechanical flexibility, elasticity, toughness, fatigue resistance, and especially stretchability.…”

Two-Dimensional Nanosheets of Titanium Carbonitride Ti3CNTx MXene for Microwave Absorption in the X and Ku Bands

“…Theoretical work reported that the magnetic property of N-doped Ti 3 C 2 MXene can be affected by the concentrations and the distributions of nitrogen . It has been reported that nitrogen doping is a promising approach to induce the basal-plane localized magnetic moments in graphene nanosheets. , Liu et al reported that the control of the graphitic N-doping configuration endows graphene coatings with high magnetic responsiveness, thus leading to the synergistic effect of EMI shielding and EM wave absorption. N-containing Ti 3 CNT x films have also been demonstrated with magnetic properties at lower temperatures .…”

Synthesis of Vertical Graphene Nanowalls on Substrates by PECVD as Effective EMI Shielding Materials

“…26 Although the horizontal graphene film can be transformed into a thick three-dimensional (3D) structure, such as using textile substrates, the thickness of the composite film would unavoidably increase to the millimeter scale. 27,28 Owing to the lightweight, porous structure, and high conductivity that cause the tuning of relative permittivity and favors impedance matching, 14 vertical graphene nanowalls (VGNs) have been taken into consideration. Composed of vertically aligned few-layer graphene flakes, VGNs maintain the fantastic electrical properties of graphene.…”

“…The total EMI SE (SE T ) was smaller than 5 dB in the X-band for the few-layer thick graphene films . Although the horizontal graphene film can be transformed into a thick three-dimensional (3D) structure, such as using textile substrates, the thickness of the composite film would unavoidably increase to the millimeter scale. , …”