Multifunctional waterproof MXene-coated wood with high electromagnetic shielding performance

Wei, Yuyi; Dai, Zhenhua; Zhang, Yanfei; Zhang, Weiwei; Gu, Jin; Hu, Chuanshuang; Lin, Xiuyi

doi:10.1007/s10570-022-04609-3

Cited by 26 publications

(10 citation statements)

References 37 publications

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“…Meanwhile, introduced abundant interfaces between the MS and WPU synergistically contributed to high interfacial polarization of incident EMW. Additionally helpful for the loss of incident EMW was the dipolar polarization produced by localized defects and MS surface terminations (Figure c). − The penetrating EMW would also experience multiple reflections derived from the layered structure of MS, extending the propagation paths and increasing the interactions between EMW and MS (Figure b) . Therefore, due to the cooperation of MS and WPU, the composite films demonstrated good EMI shielding performance.…”

Section: Resultsmentioning

confidence: 99%

From MXene Trash to Ultraflexible Composites for Multifunctional Electromagnetic Interference Shielding

Liu

Zheng

et al. 2022

ACS Appl. Mater. Interfaces

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The development of flexible composites based on the transition metal carbides/nitrides (MXenes) is gaining popularity because of MXenes’ high application potentials for electromagnetic interference (EMI) shields. Here, we prepare a new type of ultraflexible composite films composed of “trashed” MXene sediment (MS) and waterborne polyurethane using a simple, facile solution casting approach. In addition to the outstanding mechanical strength and electrical conductivity, an extremely wide-range of MS contents can be achieved for the composites, resulting in EMI shielding effectiveness (SE) that may be controlled over a wide range. The X-band EMI SE of the flexible, low-density composites containing 70 wt % MS reaches 45.3 dB at a thickness of merely 0.51 mm. Moreover, the SE values of more than 34.5 dB in the ultrabroadband gigahertz frequency range including X-band, P-band, K-band, and R-band, are accomplished for the thin composites. Furthermore, the MS/WPU composite films show excellent electrothermal and photothermal performance, demonstrating the multifunctionalities of the MS-based EMI shields. Combined with the cost-efficient, sustainable, and scalable preparation approach, the ultraflexible, multifunctional composites from “trashed MXene” show great potentials for next-generation electronics. This work also opens a new avenue for the creation of innovative, high-performance, multifunctional flexible composites.

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Section: Resultsmentioning

confidence: 99%

From MXene Trash to Ultraflexible Composites for Multifunctional Electromagnetic Interference Shielding

Liu

Zheng

et al. 2022

ACS Appl. Mater. Interfaces

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“…Wei et al [ 73 ] improved the environmental stability of MXene-coated wood by coating it with water-based acrylic resin (WA). The microstructures of untreated wood, MXene/wood, and WA-MXene/wood were examined by SEM.…”

Section: Modification Of Sfr/rpufmentioning

confidence: 99%

“…Wei et al [ 73 ] developed a simple and practical approach to produce highly conductive, flame-retardant wood with excellent EMI shielding properties. This coating can also be applied to RPUF.…”

Section: Modification Of Sfr/rpufmentioning

confidence: 99%

Surface Flame-Retardant Systems of Rigid Polyurethane Foams: An Overview

et al. 2023

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Rigid polyurethane foam (RPUF) is one of the best thermal insulation materials available, but its flammability makes it a potential fire hazard. Due to its porous nature, the large specific surface area is the key factor for easy ignition and rapid fires spread when exposed to heat sources. The burning process of RPUF mainly takes place on the surface. Therefore, if a flame-retardant coating can be formed on the surface of RPUF, it can effectively reduce or stop the flame propagation on the surface of RPUF, further improving the fire safety. Compared with the bulk flame retardant of RPUF, the flame-retardant coating on its surface has a higher efficiency in improving fire safety. This paper aims to review the preparations, properties, and working mechanisms of RPUF surface flame-retardant systems. Flame-retardant coatings are divided into non-intumescent flame-retardant coatings (NIFRCs) and intumescent flame-retardant coatings (IFRCs), depending on whether the flame-retardant coating expands when heated. After discussion, the development trends for surface flame-retardant systems are considered to be high-performance, biological, biomimetic, multifunctional flame-retardant coatings.

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“…The reflection coefficient (R), absorption coefficient (A), transmission coefficient (T), microwave reflection (SER), microwave absorption (SEA), total EMI SE (SET), and shielding efficiency were calculated from S11 and S21 by the following equations. [21] 𝑅 = |𝑆 11 | 2…”

Section: Characterizationmentioning

confidence: 99%

Anisotropic MXene@Wood Composites for Tunable Electromagnetic Interference Shielding

Wei

Dai

Zhang

et al. 2022

Preprint

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To comply with the increasingly complex and changeful application environment, realizing effective shielding effectiveness (SE) adjustment is the trend of next-generation electromagnetic interference (EMI) shielding materials. Herein, we utilize the natural wood as substrate, and MXene sheets are coated to the wood surface to develop anisotropic MXene@wood (M@W) composites with outstanding EMI shielding performance. The M@W displays apparent different properties between cross section and tangential section, in terms of pore structure, dielectric properties, polarization relaxation, impedance matching condition, and EMI SE. In the tangential section, the angle between wood grain and the electric field direction of incident electromagnetic wave governs the shielding performance. The EMI SE ranges from 57.6 dB to 27.4 dB when the angle changes from 0° (parallel to grain of wood) to 90° (perpendicular to grain of wood). This finding provides invaluable guidance for the design of anisotropic materials with convenient EMI shielding performance regulation.

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Multifunctional waterproof MXene-coated wood with high electromagnetic shielding performance

Cited by 26 publications

References 37 publications

From MXene Trash to Ultraflexible Composites for Multifunctional Electromagnetic Interference Shielding

From MXene Trash to Ultraflexible Composites for Multifunctional Electromagnetic Interference Shielding

Surface Flame-Retardant Systems of Rigid Polyurethane Foams: An Overview

Anisotropic MXene@Wood Composites for Tunable Electromagnetic Interference Shielding

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