‘Trigger-free’ self-healable electromagnetic shielding material assisted by co-doped graphene nanostructures

Menon, Aishwarya V.; Choudhury, Balamati; Madras, Giridhar; Bose, Suryasarathi

doi:10.1016/j.cej.2019.122816

Cited by 35 publications

(14 citation statements)

References 46 publications

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“…In the quest for an effective EMI shield, nanotechnology has traveled a long path from metal-based EM wave reflectors to lightweight, flexible polymeric EM wave absorbers. [81] Carbon nanostructures as fillers to polymers and their composites have been found to exhibit properties that increase the EMI shielding effectiveness. [17] Therefore, in addition to metals, carbon-based nanostructures such as activated carbon, carbon black, carbon aerogels, [1] graphene, [82] CNTs [83,84] and their hybrid composites have been broadly considered by researchers as EMI shielding materials because of their high electrical conductivities, low density, outstanding flexibility, chemical inertness, cost-effectiveness, environmental friendliness, easy processability, and exceptional mechanical properties.…”

Section: Carbon/polymer Compositesmentioning

confidence: 99%

“…High-performance materials are needed to meet the requirements of minimum thickness, economic robustness, high strength, and easy manufacturing procedure for practical applications of EMI shielding to make the material competitive in the market. To fulfill these requirements, synthesis of such composite materials was reported by Menon et al, [81,150] where they used semiconducting and magnetic phases with GO to form rGO/MoS 2 /Fe 3 O 4 laminated structures with a thickness of 200 μm that could absorb 99.9% of microwaves with a shielding effectiveness of 65 dB. Another composite showed an SE of 43.6 dB at 18 GHz with up to 96% absorption of EM waves, where a self-healable factor is added using polyurethane matrix.…”

Section: Metal/carbon/polymer Compositesmentioning

confidence: 99%

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Electromagnetic interference cognizance and potential of advanced polymer composites toward electromagnetic interference shielding: A review

Devi

Ray

2022

Polymer Engineering & Sci

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The exigency of electromagnetic shielding is derived from the electromagnetic pollution caused by the widespread use of electronic devices. Electromagnetic waves from innumerable electrical sources radiate in the atmosphere and generate electromagnetic interference (EMI). Such EMI can interrupt other instruments and threaten human health. Therefore, future designs of electronic devices, regardless of their size and use, necessitate advanced electromagnetic shielding materials and techniques that can limit or completely block the transmission of electromagnetic waves in the atmosphere. The purpose of this review is to investigate the use of polymer-based composites for EMI shielding and study their configurations. The objectives of this study and the societal and environmental impacts of electromagnetic waves are discussed in detail.The available reports, the worldwide contribution by researchers in the field, the limitations of the available materials, and the inventions required have directed our interest toward this area of research. The review summarizes EMI shielding cognizance, current research gaps, and future recommendations.

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Section: Carbon/polymer Compositesmentioning

confidence: 99%

Section: Metal/carbon/polymer Compositesmentioning

confidence: 99%

Electromagnetic interference cognizance and potential of advanced polymer composites toward electromagnetic interference shielding: A review

Devi

Ray

2022

Polymer Engineering & Sci

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“…Recently, many efforts have been done to develop healable EMI shielding CPCs with the polymer matrix owning reversible bonds [28]. For instance, a healable polyurethane with disulfide bonds was filled with carbon nanotube (CNT)/graphene oxide (GO)/MoS 2 /Fe 3 O 4 nanoparticles, and the resultant composite exhibited healing efficiency of 70% in mechanical properties and nearly unaltered EMI SE post-healed for 24 h at room temperature [29]. Contacting the cracked polyacrylamide/cellulose nanofiber/CNT hydrogel for a week could recover the EMI SE with high retention of ~ 96% [30].…”

Section: Introductionmentioning

confidence: 99%

A Healable and Mechanically Enhanced Composite with Segregated Conductive Network Structure for High-Efficient Electromagnetic Interference Shielding

Wang

Kong

et al. 2021

Nano-Micro Lett.

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Highlights The cationic waterborne polyurethanes microspheres with Diels-Alder bonds were synthesized for the first time. The electrostatic attraction not only endows the composite with segregated structure to gain high electromagnetic-interference shielding effectiveness, but also greatly enhances mechanical properties. Efficient healing property was realized under heating environment. Abstract It is still challenging for conductive polymer composite-based electromagnetic interference (EMI) shielding materials to achieve long-term stability while maintaining high EMI shielding effectiveness (EMI SE), especially undergoing external mechanical stimuli, such as scratches or large deformations. Herein, an electrostatic assembly strategy is adopted to design a healable and segregated carbon nanotube (CNT)/graphene oxide (GO)/polyurethane (PU) composite with excellent and reliable EMI SE, even bearing complex mechanical condition. The negatively charged CNT/GO hybrid is facilely adsorbed on the surface of positively charged PU microsphere to motivate formation of segregated conductive networks in CNT/GO/PU composite, establishing a high EMI SE of 52.7 dB at only 10 wt% CNT/GO loading. The Diels–Alder bonds in PU microsphere endow the CNT/GO/PU composite suffering three cutting/healing cycles with EMI SE retention up to 90%. Additionally, the electrostatic attraction between CNT/GO hybrid and PU microsphere helps to strong interfacial bonding in the composite, resulting in high tensile strength of 43.1 MPa and elongation at break of 626%. The healing efficiency of elongation at break achieves 95% when the composite endured three cutting/healing cycles. This work demonstrates a novel strategy for developing segregated EMI shielding composite with healable features and excellent mechanical performance and shows great potential in the durable and high precision electrical instruments.

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“…MIM technology can not only reduce products weight, but also give the material more excellent performance, such as, acoustic insulation, thermal conductivity, as well as electrical conductivity. [1][2][3][4] Recently, the widespread application of electrical products produced many electromagnetic problems, for instance, it may cause insensitivity and breakdown of communication equipment, 5,6 and even affect human health. 7 The urgent affairs that we facing are developing a lightweight material with high-efficient electromagnetic interference (EMI) shielding performance, which has exerted tremendous influence on society and life.…”

Section: Introductionmentioning

confidence: 99%

Effect of microstructure induced by microcellular injection molding on electromagnetic interference shielding properties

Liu

Guan

et al. 2021

J of Applied Polymer Sci

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Preparing lightweight and versatile products is the unremitting goal of industry to save resources and energy. Lightweight carbon fiber reinforced polypropylene (CF/PP) composite foams with high‐performance electromagnetic interference (EMI) shielding materials were fabricated by microcellular injection molding (MIM) technology. The average length and distribution of CF in CF/PP composite foams were examined. Thanks to the introduction of foaming process, the average CF length of composite foams was 33.98% longer than that of solids, which effectively enhanced the electrical conductivity and EMI shielding properties. The effect of shot size, gas content, and injection rate on the electrical conductivity and EMI properties was investigated. With melt shot size of 2/3 of the cavity volume, gas content of 0.5 wt% N2 and injection rate of 100 mm/s, optimal cellular structure of the composite material was obtained. The EMI shielding effectiveness (SE) reaches 36.94 dB, which is the highest value achieved by using MIM technology to the best of the authors' knowledge. In addition, the mechanical properties of cellular structure can still maintain good values, with the tensile strength and impact strength improved by 15.3% and 14.03%, respectively.

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‘Trigger-free’ self-healable electromagnetic shielding material assisted by co-doped graphene nanostructures

Cited by 35 publications

References 46 publications

Electromagnetic interference cognizance and potential of advanced polymer composites toward electromagnetic interference shielding: A review

Electromagnetic interference cognizance and potential of advanced polymer composites toward electromagnetic interference shielding: A review

A Healable and Mechanically Enhanced Composite with Segregated Conductive Network Structure for High-Efficient Electromagnetic Interference Shielding

Effect of microstructure induced by microcellular injection molding on electromagnetic interference shielding properties

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