Structural design of asymmetric gradient alternating multilayered CNF/MXene/FeCo@rGO composite film for efficient and enhanced absorbing electromagnetic interference shielding

Ma, Meng; Shao, Wenqin; Chu, Qindan; Tao, Wenting; Chen, Si; Shi, Yanqin; He, Huiwen; Zhu, Yulu; Wang, Xu

doi:10.1039/d3ta06467k

Cited by 31 publications

(5 citation statements)

References 51 publications

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“…When the filling amount of MCHS ranges between 3 and 7 wt %, the distance between carbon nanospheres gradually expands, leading to increased conductivity. Consequently, a microcurrent capable of absorbing and dissipating EMW gradually develops, thereby enhancing the absorption of EMW . Moreover, the connectivity between carbon nanospheres gradually intensifies, increasing the number of contact points.…”

Section: Resultsmentioning

confidence: 99%

“…Consequently, a microcurrent capable of absorbing and dissipating EMW gradually develops, thereby enhancing the absorption of EMW. 70 Moreover, the connectivity between carbon nanospheres gradually intensifies, increasing the number of contact points. This phenomenon serves to enhance the absorption and dissipation of EMW.…”

Section: Effect Of Conductive Loss On Emw Absorbing Performancementioning

confidence: 99%

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Carbon Nanospheres for Electromagnetic Wave Absorption and Shielding

Wu,

Liu,

Zhao

2024

ACS Appl. Nano Mater.

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Here, composites filled with carbon nanospheres of different morphologies exhibit the same electromagnetic wave (EMW) absorption and loss mechanisms when they possess the same carbon content. Conductive loss is their primary EMW absorbing mechanism, while the effect of polarization loss can be ignored entirely. Composites with a filling amount lower than the percolation threshold of the carbon nanospheres and certain conductivity possess excellent EMW absorbing behavior, while composites with a filling amount close to or higher than the percolation threshold reveal outstanding EM interference (EMI) shielding. The minimum reflection loss (RL min ) and maximum effective absorption bandwidth (EAB max ) of mesoporous carbon hollow nanospheres (MCHS) reach −50.52 dB and 5.90 GHz at an ultralow filling amount of 3 wt %. The EMI shielding effectiveness (SE) of the MCHS is as high as 118.23 dB at a fill level of 12 wt %, with an average SE of 84.50 dB. Among them, conductive loss has a more significant contribution to low-frequency EMW absorption. Frequency-selective EMW absorbing performance can be obtained by simply adjusting the material conductivity. Compared with the currently reported carbon nanomaterials, the carbon nanospheres in this study reveal significant advantages in EM-resisting performances and unique lowfilling characteristics.

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Section: Resultsmentioning

confidence: 99%

Section: Effect Of Conductive Loss On Emw Absorbing Performancementioning

confidence: 99%

Carbon Nanospheres for Electromagnetic Wave Absorption and Shielding

Wu,

Liu,

Zhao

2024

ACS Appl. Nano Mater.

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“…Ma et al successfully designed well-structured asymmetric gradient multilayer composite films by establishing controllable electromagnetic gradients. 105 Cellulose nanofibers were used as the matrix, and a layer-by-layer filtration method was employed to distribute FeCo@ rGO and MXene fillers evenly, forming an ordered multilayer structure with alternating conductive and magnetic gradients. Due to the gradient absorption, shielding, and reflection mechanisms of electromagnetic waves within the film layers, the electromagnetic shielding effectiveness of the symmetric gradient alternating 6-layer composite film reached 45.2 dB in the X-band, with a reflection coefficient decreasing to 0.71 when 20 wt % filler was added.…”

Section: Mxene-based Four-element Composite Electromagnetic Shielding...mentioning

confidence: 99%

“…Ma et al successfully designed well-structured asymmetric gradient multilayer composite films by establishing controllable electromagnetic gradients . Cellulose nanofibers were used as the matrix, and a layer-by-layer filtration method was employed to distribute FeCo@ rGO and MXene fillers evenly, forming an ordered multilayer structure with alternating conductive and magnetic gradients.…”

Section: Mxene-based Four-element Composite Electromagnetic Shielding...mentioning

confidence: 99%

MXene Composite Electromagnetic Shielding Materials: The Latest Research Status

Liu,

Zhao

2024

ACS Appl. Mater. Interfaces

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MXene emerges as a premier candidate for electromagnetic shielding owing to its unique properties as a novel two-dimensional material. Its exceptional electrical conductivity, chemical reactivity, surface tunability, and facile processing render it highly suitable for diverse electromagnetic shielding applications. The research status of MXene and MXene-based electromagnetic shielding materials is systematically discussed in this paper. First, the research status of MXene as a single-component electromagnetic shielding material is briefly introduced. Subsequently, the research status of composite structures constructed by MXene with polymers, carbon derivatives, and ferrites is introduced in detail. Furthermore, the research progress of MXene-based ternary and quaternary composite electromagnetic shielding materials is further focused. Finally, the application of MXene-based composite electromagnetic shielding materials is prospected. A deeper understanding of MXene’s electromagnetic shielding properties is facilitated by this paper, providing the direction for the future development of two-dimensional materials in the design and processing of electromagnetic shielding materials.

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“…Its structure contains several hydroxyl active sites, formed through intermolecular and hydrogen bonding, in both crystalline and amorphous states. , Cellulose, which has been widely used for its excellent mechanical properties, low density, environmental friendliness, biodegradability, and abundant biological resources, is to be an excellent alternative of synthetic materials such as poly(vinyl alcohol), polyurethane foam, and steel . It has been compounded with conductive fillers (e.g., carbon black, metal particles, , and MXene , ) in the fields of electromagnetic shielding, electronic sensor, and thermal conductivity . However, cellulose is a combustible material with a limiting oxygen index (LOI) of 18%, which restricts its possible uses in many useful industries. , Therefore, the design and fabrication of cellulose with excellent flame retardancy remain a great challenge.…”

Section: Introductionmentioning

confidence: 99%

Cellulose Nanofiber-Based Nanocomposite Films with Efficient Electromagnetic Interference Shielding and Fire-Resistant Performance

Shao,

Zhang,

Liang

et al. 2024

ACS Appl. Mater. Interfaces

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Cellulose nanofiber (CNF) has been widely used as a flexible and lightweight polymer matrix for electromagnetic shielding and thermally conductive composite films because of its excellent mechanical strength, environmental performance, and low cost. However, the lack of flame retardancy seriously hinders its further application. Herein, renewable and biomass-sourced Larginine (AR) was used to surface-modify ammonium polyphosphate (APP) and an environmentally friendly biobased flame retardant was synthesized by the coordination of zinc sulfate heptahydrate (ZnSO 4 •7H 2 O), which was named AAZ. AAZ was deposited on the surface of CNF by electrostatic adsorption and Zn 2+ complexation. The biobased compatibilizer Triton X-100 was employed to assist the exfoliation of graphene nanoplatelets (GNPs) and their dispersion in the CNF matrix. Due to the formation of a dense lamellar layer resembling a shell structure, the CNF/GNPs composite films with a tensile strength of 52 MPa were obtained via vacuum-assisted filtration. Because the phosphorus-containing group produces a protective layer of P x O y compound and promotes the formation of a carbon layer by CNF and the combustion releases ammonia gas, the fire-resistant performance of the composite films was greatly improved. Compared with the pure CNF film, the composite film exhibits 33% reduction in PHRR value and 40% reduction in THR. In addition, the CNF/GNPs composite film with 20 wt % GNPs possessed high conductivity (2079.2 S/m) and electromagnetic interference (EMI) shielding effectiveness (37 dB). The ultrathin CNF/GNPs composite films have excellent potential for use as efficient flame retardant and EMI shielding materials.

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Structural design of asymmetric gradient alternating multilayered CNF/MXene/FeCo@rGO composite film for efficient and enhanced absorbing electromagnetic interference shielding

Abstract: Asymmetrical and electromagnetic gradient multilayered CNF/MXene/FeCo@rGO composite film with efficient and enhanced absorbing EMI shielding property was constructed by alternating filtration of different dispersions.

Cited by 31 publications

References 51 publications

Carbon Nanospheres for Electromagnetic Wave Absorption and Shielding

Carbon Nanospheres for Electromagnetic Wave Absorption and Shielding

MXene Composite Electromagnetic Shielding Materials: The Latest Research Status

Cellulose Nanofiber-Based Nanocomposite Films with Efficient Electromagnetic Interference Shielding and Fire-Resistant Performance

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