Flexible Polydimethylsiloxane Composite with Multi-Scale Conductive Network for Ultra-Strong Electromagnetic Interference Protection

Li, Jie; Sun, He; Yi, Shuangqin; Zou, Kangkang; Zhang, Dan; Zhong, Gan‐Ji; Yan, Ding‐Xiang; Li, Zhong‐Ming

doi:10.1007/s40820-022-00990-7

Cited by 40 publications

(17 citation statements)

References 77 publications

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“…The ideal impedance matching will be obtained when the | Z in / Z 0 | value is closer to 1. Importantly, the high dissipation and appropriate impedance matching lay the foundation for excellent MA performance. , As shown in Figure c, the coating with higher conductivity possesses more dielectric loss types, thus contributing to a superior α. The highest α in the SLCP25 specimen is observed at high frequency with a far beyond value, indicating its good attenuation capability.…”

Section: Resultsmentioning

confidence: 99%

Peelable Microwave Absorption Coating with Reusable and Anticorrosion Merits

Li,

Shi,

Zhang

et al. 2024

ACS Appl. Mater. Interfaces

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The peelable microwave absorption (MA) coating with reversible adhesion for stable presence on substrates and easy release without any residuals is highly desired in temporary electromagnetic protection, which can quickly enter and disengage the electromagnetic protection state according to the real-time changeable harsh surroundings. On the contrary, with the incorporation of abundant absorbent to achieve excellent MA ability, the tunable adhesion and sufficient cohesion are extremely challenging to fulfill the above requirement. The reported peelable coatings still have problems in controlling adhesion/cohesion strength and coating release, facing substantial residuals after peeling even using complex chemical modification or abundant additives. Herein, a peelable MA coating based on the block characteristics of polar and nonpolar segments of poly(styrene-(ethylene-co-butylene)-styrene) (SEBS) is successfully developed. The polyaniline-decorated carbon nanotube as a microwave absorber plays a positive influence on the adhesion/cohesion of the coating due to bonding interaction. The competitive effective absorption bandwidth (EAB) of 8.8 GHz and controllable yet reversible adhesion release on various substrates and complex surfaces have been achieved. The reusability endows peelable MA coating with 93% retention of EAB even after ten coating-peeling cycles. The coating with excellent chemical and adhesion stability can effectively protect substrates from salt/acid/alkali corrosion, showing over 98% retention of EAB even after 8 h of accelerated corrosion. Our peelable MA coating via a general yet reliable approach provides a prospect for temporary electromagnetic protection.

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Section: Resultsmentioning

confidence: 99%

Peelable Microwave Absorption Coating with Reusable and Anticorrosion Merits

Li,

Shi,

Zhang

et al. 2024

ACS Appl. Mater. Interfaces

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“…Specifically, the evenly distributed CNT fillers can overlap each other easily due to the high aspect ratio to form 3D conductive networks, which can accelerate the electron hopping/migrating and induce eddy currents under stimulation by alternating electromagnetic fields, thus further converting microwave energy into heat by conductive loss. − Moreover, apart from the overlapped CNT fillers, the interface with a small region between the adjacent CNT fillers and PI polymers can be regarded as the CNT-resin-CNT heterogeneous interfaces, and the plenty of above heterogeneous interfaces between adjacent CNT fillers can form capacitor-like structures where the accumulated and unevenly distributed free electrons at both capacitors ends effectively improve the interfacial polarization relaxation. The possessed abundant polarization sites also play an essential role in polarization loss. − Eventually, the optimized porous architectures can be obtained by regulating component parameters and the CNT fillers content according to foaming kinetics, which enhances the impedance matching and improves the dielectric loss ability of PI foam. Therefore, the CNT/PI foam expresses high-efficiency MA performance with ultrabroad EAB and comparable RL min values.…”

Section: Resultsmentioning

confidence: 99%

Mechanically Reinforced Rigid Polyimide Foam via Chemically Grafting Isocyanate Acid for Ultrabroad Band Microwave Absorption

Shi

Zou

et al. 2023

ACS Appl. Mater. Interfaces

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Polyimide (PI) foam with excellent microwave absorption (MA) performance and desirable compressive strength is highly critical and in demand in the structural MA components. Although the satisfactory MA performance of the present PI-based MA foams has been achieved by employing diverse methods, the relatively low compressive strength (∼KPa) restricted them from use as structural MA foams in practical application. Herein, isocyanate acid was introduced to the backbone of PI resin, which not only increased the PI backbone polarity and strength as rigid chain segment, but also served as a self-foaming component. The porous structure of PI foams was readily regulated by adjusting the water and carbon nanotube (CNT) filler contents of precursor dispersion. As a result of the improved polarity of the PI backbone resulted from the isocyanate group and high dielectric loss of CNT, the high compressive strength of 7.04 MPa and impressive MA property of the resultant PI foam with a low CNT loading ratio of 1.5 wt % were achieved, which were much higher than those reported previously. Especially, the effective absorption bandwidth (EAB) (RL < −10 dB) was up to 10.7 GHz (at the thickness of 3 mm), covering the C, X, and Ku bands simultaneously. Meanwhile, the EAB of the as-prepared PI foam retained 9.3 and 9.7 GHz even after being subjected to liquid nitrogen (−196 °C) and high temperature (300 °C) treatments due to the desirable stability of PI. In addition, the excellent thermal insulation resulted from the pores structure and low filler content was achieved, where the top surface only presented 60 °C after placing on 300 °C platform for 30 min. The high compressive strength, impressive MA property, and thermal insulation endowed the resultant CNT/PI foam with great potential application as structural MA foam in a harsh service environment.

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“…The MXene family continues to expand, as researchers explore new combinations of transition metals and surface functionalization techniques. Each MXene material possesses unique properties and potential applications, making the field of MXene research dynamic and exciting. − However, as also discussed in the Introduction section, the major issue in MXenes is the easy restacking or agglomeration of MXene sheets, which hinders the mobility of the electrolyte between the layers and drastically affects electrochemical properties. Researchers have attempted various techniques to enhance the electrochemical properties of MXenes, such as modifying the etching solution or parameters, − implementing postsynthesis treatments like alkalinization, , and creating composites by combining MXene with other suitable materials. , Composites can improve properties in two ways.…”

Section: Resultsmentioning

confidence: 99%

Intercalation of C60 into MXene Multilayers: A Promising Approach for Enhancing the Electrochemical Properties of Electrode Materials for High-Performance Energy Storage Applications

Bukhari,

Iqbal,

Awan

et al. 2023

ACS Omega

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In this study, we report on the enhancement of the electrochemical properties of MXene by intercalating C60 nanoparticles between its layers. The aim was to increase the interlayer spacing of MXene, which has a direct effect on capacitance by allowing the electrolyte flow in the electrode. To achieve this, various concentrations of Ti 3 SiC 2 (known as MXene) and C60 nanocomposites were prepared through a hydrothermal process under optimal conditions. The resulting composites were characterized by using X-ray diffraction, scanning electron microscopy, energy dispersive spectroscopy, Raman spectroscopy, and cyclic voltammetry. Electrodes were fabricated using different concentrations of MXene and C60 nanocomposites, and current− voltage (I−V) measurements were performed at various scan rates to analyze the capacitance of pseudo supercapacitors. The results showed the highest capacitance of 348 F g 1− for the nanocomposite with a composition of 90% MXene and 10% C60. We introduce MXene-C60 composites as promising electrode materials for supercapacitors and highlight their unique properties. Our work provides a new approach to designing high-performance electrode materials for supercapacitors, which can have significant implications for the development of efficient energy storage systems.

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Flexible Polydimethylsiloxane Composite with Multi-Scale Conductive Network for Ultra-Strong Electromagnetic Interference Protection

Abstract: The PDMS/Ag@PLASF/CNT composites owned good retention (> 90%) of electromagnetic interference shielding performance even after subjected to a simulated aging strategy or 10,000 bending-releasing cycles.

Cited by 40 publications

References 77 publications

Peelable Microwave Absorption Coating with Reusable and Anticorrosion Merits

Peelable Microwave Absorption Coating with Reusable and Anticorrosion Merits

Mechanically Reinforced Rigid Polyimide Foam via Chemically Grafting Isocyanate Acid for Ultrabroad Band Microwave Absorption

Intercalation of C60 into MXene Multilayers: A Promising Approach for Enhancing the Electrochemical Properties of Electrode Materials for High-Performance Energy Storage Applications

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