Carbon Nanotube–Multilayered Graphene Edge Plane Core–Shell Hybrid Foams for Ultrahigh‐Performance Electromagnetic‐Interference Shielding

Song, Qiang; Ye, Fang; Yin, Xiaowei; Li, Wei; Li, Hejun; Liu, Yongsheng; Li, Kezhi; Xie, Keyu; Li, Tongtong; Fu, Qiangang; Cheng, Laifeng; Zhang, Litong; Wei, Bingqing

doi:10.1002/adma.201701583

Cited by 601 publications

(325 citation statements)

References 40 publications

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“…[1][2][3][4][5][6][7][8][9][10][11] In addition, EM radiation is a major concern for human health without other metallic-or nonmetallic-particles [40,42,51,53,[55][56][57][58][59][60] as fillers in various composites for EMI shielding purposes. As the electronic devices decrease in size, and operate at ever increasing frequencies, they produce more heat and EM waves, which result in faster degradation of such devices and negative effects on adjacent electronic systems.…”

Section: Introductionmentioning

confidence: 99%

Dual‐Functional Graphene Composites for Electromagnetic Shielding and Thermal Management

Kargar

Barani

Balinskiy

et al. 2018

Adv Elect Materials

197

132

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and environment. [12][13][14] The current industrial and safety standards require blocking of more than 99% of the EM radiation from any electronic devices. [1,[15][16][17] From the other side, the operation of the electronic devices can be disrupted by the outside EM waves. The heat and EM radiation have an inherent connection-absorption of EM waves by any material results in its heating. The energy from EM wave transfers to electrons and then to phonons-quanta of crystal lattice vibrations. The conventional approach for handling the heat and EM radiation problems is based on utilization of the thermal interface materials (TIM), which can spread the heat, and electromagnetic interference (EMI) shielding materials, which can protect from EM waves. These two types of materials have different, and, often, opposite characteristics, e.g., excellent EMI material can be a poor heat conductor, while efficient TIM can utilize electrically nonconductive fillers, resulting in its transparency for EM waves. Here, we propose a concept of the "dual-functional" EMI shielding-TIM materials, and demonstrate it on the example of graphene composites.It is well known that EMI shielding requires interaction of the EM waves with the charge carriers inside the material so that EM radiation is reflected or absorbed. For this reason, the EMI shielding material must be electrically conductive or contain electrically conductive fillers, although a high electrical conductivity is not required. The bulk electrical resistivity on the order of 1 Ω cm is sufficient for most of EMI shielding applications. [1,3,15] Most of the polymer-based materials widely used as TIMs in electronic packaging are electrically insulating and, therefore, transmit EM waves. Conventionally, metal particles are added as fillers in high volume fractions to the base polymer matrix in order to increase the electrical conductivity and prevent EM wave propagation from the device to the environment and vice versa. [1,[18][19][20][21] However, the polymer-metal composites suffer from high weight, cost, and corrosion, which make them an undesirable choice for the state-of-the-art downscaled electronics. Several studies reported the use of carbon fibers, [22][23][24][25][26][27][28][29] carbon black, [30,31] bulk graphite, [32][33][34] carbon nanotubes (CNT), [16,17,[35][36][37][38][39] reduced graphene oxide (rGO), [2,6,[40][41][42][43][44][45][46][47][48][49][50] graphene, [51][52][53][54] and combination of carbon allotropes with orThe synthesis and characterization of epoxy-based composites with few-layer graphene fillers, which are capable of dual-functional applications, are reported. It is found that composites with certain types of few-layer graphene fillers reveal an efficient total electromagnetic interference shielding, SE tot ≈ 45 dB, in the important X-band frequency range, f = 8.2 −12.4 GHz, while simultaneously providing high thermal conductivity, K ≈ 8 W m −1 K −1 , which is a factor of ×35 larger than that of the base matrix material. The efficiency of the d...

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Section: Introductionmentioning

confidence: 99%

Dual‐Functional Graphene Composites for Electromagnetic Shielding and Thermal Management

Kargar

Barani

Balinskiy

et al. 2018

Adv Elect Materials

197

132

View full text Add to dashboard Cite

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“…Recently, a variety of electrically conductive fillers including metallic nanowires and nanoparticles,2,5–7 liquid‐metal (LM) droplets,8–10 carbon‐based materials (e.g., graphene, carbon fibers, and carbon nanotubes)1,11,12 and 2D transition‐metal carbides13–15 have been incorporated into polymer matrix to yield EMI shielding polymer composites. While these composites are easily processable, lightweight, and mechanically flexible, their EMI shielding effectiveness (SE) is inevitably plagued by the reduction in electrical conductivity with the applied stretch,6–8,12,15,16 a common phenomenon in the current stretchable conductors 17–19.…”

mentioning

confidence: 99%

Highly Stretchable Polymer Composite with Strain‐Enhanced Electromagnetic Interference Shielding Effectiveness

et al. 2020

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Polymer composites with electrically conductive fillers have been developed as mechanically flexible, easily processable electromagnetic interference (EMI) shielding materials. Although there are a few elastomeric composites with nanostructured silvers and carbon nanotubes showing moderate stretchability, their EMI shielding effectiveness (SE) deteriorates consistently with stretching. Here, a highly stretchable polymer composite embedded with a three‐dimensional (3D) liquid‐metal (LM) network exhibiting substantial increases of EMI SE when stretched is reported, which matches the EMI SE of metallic plates over an exceptionally broad frequency range of 2.65–40 GHz. The electrical conductivities achieved in the 3D LM composite are among the state‐of‐the‐art in stretchable conductors under large mechanical deformations. With skin‐like elastic compliance and toughness, the material provides a route to meet the demands for emerging soft and human‐friendly electronics.

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“…[1] Various strategies have been adopted to prepare 3D carbon materials, such as self-assemble method, [2] direct-templated chemical vapor deposition (CVD) [3] and carbonization of 3D organic templates [4] , and the fruitful 3D structured carbon matrix has been fabricated (e. g., 3D graphene aerogel, [5] carbon foam [6] and 3D CNTs foam [7] ). [11] Last but not the least, featuring with intrinsically hydrophobic character, most carbon base materials suffer from insufficient surface hydrophilic groups i. e. carbonyl, and /or hydroxyl groups, which is a bottleneck problem for improving their application properties. To solve this intrinsic problem, the polyimide, polyurethane foams, polypyrrole et.al were introduced into the framework of 3D graphene to enhance resilience, compressibility and mechanical stability, which highlight the importance of fillers rather than pristine graphene itself.…”

Section: Introductionmentioning

confidence: 99%

Three‐Dimensional Interconnected Porous Nitrogen‐Doped Carbon Hybrid Foam for Notably Promoted Direct Dehydrogenation of Ethylbenzene to Styrene

Zhao

2019

ChemCatChem

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Owning to the high corrosion-resistance, stable structure, unique surface properties and sustainability, the carbon-base catalysts have attracted increasing interest in heterogeneous catalysis. Herein, we report a facile combining strategy to fabricate a novel three-dimensional (3D) interconnected porous nitrogen-doped carbon hybrid foam featuring with the interconnected nitrogen-doped carbon foam coated by porous nitrogen-doped carbon (NC MS @NC Glu-NH4Cl ) by annealing the freeze-dried NH 4 Cl-glucose containing aqueous solution soaked melamine sponge (MS@Glu/NH 4 Cl). The as-prepared NC MS @NC Glu-NH4Cl hybrid foam shows 1.6 times high steady-state styrene rate (4.77 mmol g À 1 h À 1 ) with 96.4 % of selectivity for direct dehydrogenation of ethylbenzene to styrene as compared to the well-established nanodiamond. This work not only generates an excellent carbon catalyst to replace the established nanodiamond for direct dehydrogenation of ethylbenzene, but also opens up a potential avenue for designing novel carbon materials towards the adsorption and supercapacitor besides acting as a promising catalyst for diverse transformations.[a] Dr.

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Carbon Nanotube–Multilayered Graphene Edge Plane Core–Shell Hybrid Foams for Ultrahigh‐Performance Electromagnetic‐Interference Shielding

Cited by 601 publications

References 40 publications

Dual‐Functional Graphene Composites for Electromagnetic Shielding and Thermal Management

Dual‐Functional Graphene Composites for Electromagnetic Shielding and Thermal Management

Highly Stretchable Polymer Composite with Strain‐Enhanced Electromagnetic Interference Shielding Effectiveness

Three‐Dimensional Interconnected Porous Nitrogen‐Doped Carbon Hybrid Foam for Notably Promoted Direct Dehydrogenation of Ethylbenzene to Styrene

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