Interface Engineered Microcellular Magnetic Conductive Polyurethane Nanocomposite Foams for Electromagnetic Interference Shielding

Sang, Guolong; Xu, Pei; Yan, Ting; Murugadoss, Vignesh; Naik, Nithesh; Ding, Yunsheng; Guo, Zhanhu

doi:10.1007/s40820-021-00677-5

Cited by 118 publications

(47 citation statements)

References 78 publications

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“…3e). Generally, EMI shielding performance of conductive porous composites is influenced by the reflection, absorption, and multi-reflections, corresponding to the mobile charge carriers, electric dipoles, and interior interfaces/surfaces, respectively [19,56,62]. The micrometer-sized pores induced more reflections or scatterings of incident EM waves, which had more interactions with the pore walls in the C-MXene@ PI composite foams, efficiently increasing SE A [16][17][18]63].…”

Section: Emi Shielding Performance Of the Composite Foammentioning

confidence: 99%

Porous and Ultra-Flexible Crosslinked MXene/Polyimide Composites for Multifunctional Electromagnetic Interference Shielding

et al. 2022

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Lightweight, ultra-flexible, and robust crosslinked transition metal carbide (Ti3C2 MXene) coated polyimide (PI) (C-MXene@PI) porous composites are manufactured via a scalable dip-coating followed by chemical crosslinking approach. In addition to the hydrophobicity, anti-oxidation and extreme-temperature stability, efficient utilization of the intrinsic conductivity of MXene, the interfacial polarization between MXene and PI, and the micrometer-sized pores of the composite foams are achieved. Consequently, the composites show a satisfactory X-band electromagnetic interference (EMI) shielding effectiveness of 22.5 to 62.5 dB at a density of 28.7 to 48.7 mg cm−3, leading to an excellent surface-specific SE of 21,317 dB cm2 g−1. Moreover, the composite foams exhibit excellent electrothermal performance as flexible heaters in terms of a prominent, rapid reproducible, and stable electrothermal effect at low voltages and superior heat performance and more uniform heat distribution compared with the commercial heaters composed of alloy plates. Furthermore, the composite foams are well attached on a human body to check their electromechanical sensing performance, demonstrating the sensitive and reliable detection of human motions as wearable sensors. The excellent EMI shielding performance and multifunctionalities, along with the facile and easy-to-scalable manufacturing techniques, imply promising perspectives of the porous C-MXene@PI composites in next-generation flexible electronics, aerospace, and smart devices.

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Section: Emi Shielding Performance Of the Composite Foammentioning

confidence: 99%

Porous and Ultra-Flexible Crosslinked MXene/Polyimide Composites for Multifunctional Electromagnetic Interference Shielding

et al. 2022

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“…With the booming development of novel multiband and broadband electronic instruments, a high-performance microwave absorption (MA) material with a broadband MA ability is urgently demanded to effectively eliminate electromagnetic pollution in healthcare, electronic safety, and national defense security. [1][2][3] Among the electromagnetic microwave absorbers, [4][5][6][7][8][9][10][11][12] reduced graphene oxide (rGO) has been widely investigated due to its excellent tunability in dielectric broadband MA. [29,30] For example, Liu and Kim [29] proposed a high-capacitive metamaterial with a new structure of folded spiral conductors for ultrawide bandwidth absorbers.…”

Section: Introductionmentioning

confidence: 99%

Achieving Super Broadband Electromagnetic Absorption by Optimizing Impedance Match of rGO Sponge Metamaterials

Sun

Huang

et al. 2021

Adv Funct Materials

142

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The reduced graphene oxide (rGO) sponges exhibit exciting electromagnetic absorption (MA) performance in high-frequency range. However, it is still a great challenge to realize desirable MA property at low frequency (2-4 GHz) due to the great difficulty in balancing the good interfacial impedance matching and strong dielectric loss. Herein, the MA metamaterials based on rGO sponge with different unit shapes are reported. The relationship between the unit shape and MA performance is explored by experiment and simulation. The results show that frustum pyramid metamaterial exhibits ultrabroad band MA; the qualified absorption (the reflection loss lower than −10 dB) of electromagnetic wave can be achieved at 2.4-40 GHz. The average absorption intensity is −22.9 dB in the band of 2-40 GHz. Moreover, the bandwidth for strong absorption with an absorption rate of 99% (−20 dB) is up to 32 GHz. It is significant that the reflection loss has ignorant change even though the incident angle is increased from 5° to 40°. These are contributed to the excellent impedance matching and strong dielectric loss. These lightweight frustum pyramid metamaterials are very promising in the application for broadband electromagnetic protection.

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“…Figure S15 illustrated some of the recent advances made in the development of EMI shielding materials [ 16 , 30 , 40 , 46 , 79 – 84 ], which are compared with the overall EMI shielding effectiveness and reflection of the layered foam/film PVDF nanocomposites reported in this study. The superior electrical conductivity is often prerequisite for achieving high EMI SE in the traditional EMI shielding materials.…”

Section: Resultsmentioning

confidence: 99%

Layered Foam/Film Polymer Nanocomposites with Highly Efficient EMI Shielding Properties and Ultralow Reflection

et al. 2021

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Lightweight, high-efficiency and low reflection electromagnetic interference (EMI) shielding polymer composites are greatly desired for addressing the challenge of ever-increasing electromagnetic pollution. Lightweight layered foam/film PVDF nanocomposites with efficient EMI shielding effectiveness and ultralow reflection power were fabricated by physical foaming. The unique layered foam/film structure was composed of PVDF/SiCnw/MXene (Ti3C2Tx) composite foam as absorption layer and highly conductive PVDF/MWCNT/GnPs composite film as a reflection layer. The foam layer with numerous heterogeneous interfaces developed between the SiC nanowires (SiCnw) and 2D MXene nanosheets imparted superior EM wave attenuation capability. Furthermore, the microcellular structure effectively tuned the impedance matching and prolonged the wave propagating path by internal scattering and multiple reflections. Meanwhile, the highly conductive PVDF/MWCNT/GnPs composite (~ 220 S m−1) exhibited superior reflectivity (R) of 0.95. The tailored structure in the layered foam/film PVDF nanocomposite exhibited an EMI SE of 32.6 dB and a low reflection bandwidth of 4 GHz (R < 0.1) over the Ku-band (12.4 − 18.0 GHz) at a thickness of 1.95 mm. A peak SER of 3.1 × 10–4 dB was obtained which corresponds to only 0.0022% reflection efficiency. In consequence, this study introduces a feasible approach to develop lightweight, high-efficiency EMI shielding materials with ultralow reflection for emerging applications.

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Interface Engineered Microcellular Magnetic Conductive Polyurethane Nanocomposite Foams for Electromagnetic Interference Shielding

Cited by 118 publications

References 78 publications

Porous and Ultra-Flexible Crosslinked MXene/Polyimide Composites for Multifunctional Electromagnetic Interference Shielding

Porous and Ultra-Flexible Crosslinked MXene/Polyimide Composites for Multifunctional Electromagnetic Interference Shielding

Achieving Super Broadband Electromagnetic Absorption by Optimizing Impedance Match of rGO Sponge Metamaterials

Layered Foam/Film Polymer Nanocomposites with Highly Efficient EMI Shielding Properties and Ultralow Reflection

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