Ultrathin carbon foams for effective electromagnetic interference shielding

Li, Yang; Shen, Bin; Pei, Xueliang; Zhang, Yonggang; Yi, Da; Zhai, Wentao; Zhang, Lihua; Wei, Xing-Chang; Zheng, Wenge

doi:10.1016/j.carbon.2016.01.030

Cited by 189 publications

(78 citation statements)

References 73 publications

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“…Moreover, a small increase of electrical conductivity would lead to a signicant decrease in the skin depth of a shield. 33,34 And the decrease in the skin depth for the LG-4 lm results in the signicant enhancement of SE abs . The skin depth (d) is calculated according to the following equation:…”

Section: Morphologies Of Graphene Lmsmentioning

confidence: 98%

Ultrathin flexible graphene films with high thermal conductivity and excellent EMI shielding performance using large-sized graphene oxide flakes

Lin

Zhang

et al. 2019

RSC Adv.

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Section: Morphologies Of Graphene Lmsmentioning

confidence: 98%

Ultrathin flexible graphene films with high thermal conductivity and excellent EMI shielding performance using large-sized graphene oxide flakes

Lin

Zhang

et al. 2019

RSC Adv.

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“…The following thermal curing process was the same as the preparation of PI composites. PI/GO composite show the high tensil strength as compare to pure PI [5]. This reaction is shown in scheme 1 Fig 1. scheme 1 B. Hongli Yang, Zhi Yu,et al prepare composite of PI/RGO/MWCNT.…”

Section: IImentioning

confidence: 79%

“…%. [7]. Whereas by adding GO loading of 1 wt % results in an electrical conductivity of 7.51 × 10 -1 S cm -1 , which is 8 orders of magnitude higher than that of pure PI.…”

Section: IIImentioning

confidence: 89%

Polyimide Nanocomposites and Its Application

Nirman¹

2018

IJRASET

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Polyimide is a polymer of imide monomers. Polyimide has properties like Thermal stability Good chemical resistance, Excellent mechanical properties, High tensile strength, Lightweight flexible, resistant to heat and chemicals. Polyimide is used in various application like EMI shielding, fuel cell, supercapicator, aerospace etc. Polyimide properties can be increased by adding filler like CNT and graphene. The syntheses of various polyimide nanocomposites including diamines and dianhydrides that have been used to make novel polyimides with unique properties, are reported in this review. Properties of polyimide like thermal properties, electrical conductivity, and mechanical properties by adding CNT and graphene is studied in this review. I.INTRODUCTION In this review Article, particular emphasis is given to the polyimide nanocomposite and its various application. Polyimides have been in mass production since 1955. With their high heat-resistance, polyimides enjoy diverse applications e.g. high temperature fuel cells, EMI shielding material and as supercapacitor material, and as separation membrane. Polyimide is also known as engineering plastic. In last years many work has been done by the scientists on polyimide. Mainly work was done on polyetherimide, polyamideimide, polyesterimide, etc. polyimide belongs to the class of high-temperature polymers with balanced chemical and mechanical properties in addition to superior film-forming properties. Mechanical properties ,electrical properties and thermal stability of polyimide can be improved by adding the filler. By adding the filler or forming of nanocomposites there is drastically change in the properties of polyimide can be noticed by many scientist in their research work . Fillers like CNT, graphene, were used to increase the properties of polyimide. Mainly CNT and graphene is used as filler because of their low loading level [1]. CNTs (Carbon nanotubes) are composed of graphene sheet rolled up. CNTs is of two types SWNT and MWNT. CNTs can be considered as ultimate carbon fibers due to ultra high strength (10 to 100 GPa) and modulus (~1.0 TPa) values alongwith exceptional electrical (104-106 S/cm) and thermal properties (3000-6000W/mK) [2]. The higher intrinsic conductivity and aspect ratio of CNTs (100-5000) compared to carbon black allows the formation of conductive composites at low loading of CNTs due to low percolation thresholds (minimum loading level at which a continuous network of conducting particles is formed) resulting in achievement of better electrical conductivity and electromagnetic response at the same loading level. Graphene is a nanoscale materials based on single/multi-layered 2-D graphene sheets have attracted much attention recently due to its unusual properties [3]. Though composite materials employing carbon-based materials are presently dominated by carbon nanotubes, the intrinsic bundling of carbon nanotubes, impurities from the catalysts and high costs have been hampering their application. It has been proposed that these prob...

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“…The EMI SE (SE T ) is the logarithm of the ratio of incident power ( P i ) to transmitted power ( P t ) of radiation, which is also the sum of reflection shielding effectiveness (SE R ), absorption shielding effectiveness (SE A ), and multiple reflections (SE M ). SE is calculated according to the following Equation () [ 50 ]

SE = 10 log (P_{i} / P_{t}) = {SE}_{A} + {SE}_{R} + {SE}_{M}

…”

Section: Resultsmentioning

confidence: 99%

Strong and Flexible Carbon Fiber Fabric Reinforced Thermoplastic Polyurethane Composites for High‐Performance EMI Shielding Applications

Duan

Shi

Wang

et al. 2020

Macro Materials & Eng

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Electromagnetic shielding materials play a significant role in solving the increasing environmental problem of electromagnetic pollutions. The commonly used metal‐based electromagnetic materials suffer from high density, poor corrosion resistance, and high processing cost. Polymer composites exhibit unique combined properties of lightweight, good shock absorption, and corrosion resistance. In this study, a novel high angle sensitive composite is fabricated by combining carbon fiber (CF) fabric with thermoplastic polyurethane elastomer (TPU). The effect of stacking angle of CF fabric on EMI shielding performance of composite is studied. When the stacking angle of CF fabric changed, the electromagnetic interference (EMI) shielding effectiveness (SE) of CF fabric/TPU composite can reach a maximum of 73 dB, and the tensile strength can reach 168 MPa. In addition, the composite has anisotropic conductivity, which is conductive along the plane direction and nonconductive along the thickness direction. Moreover, the CF fabric/TPU composite manifests exceptional EMI‐SE/density/thickness value of 383 dB cm2 g−1, which is higher than most of current EMI shielding composites reported in literature. In summary, CF fabric/TPU composite is an excellent EMI shielding material that is lightweight, highly flexible, and mechanically robust, which can be applied to the field of aerospace and some intelligent electronic devices.

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Ultrathin carbon foams for effective electromagnetic interference shielding

Cited by 189 publications

References 73 publications

Ultrathin flexible graphene films with high thermal conductivity and excellent EMI shielding performance using large-sized graphene oxide flakes

Ultrathin flexible graphene films with high thermal conductivity and excellent EMI shielding performance using large-sized graphene oxide flakes

Polyimide Nanocomposites and Its Application

Strong and Flexible Carbon Fiber Fabric Reinforced Thermoplastic Polyurethane Composites for High‐Performance EMI Shielding Applications

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