scholarly journals Ultrathin, Lightweight, and Flexible CNT Buckypaper Enhanced Using MXenes for Electromagnetic Interference Shielding

2021 ◽  
Vol 13 (1) ◽  
Author(s):  
Rongliang Yang ◽  
Xuchun Gui ◽  
Li Yao ◽  
Qingmei Hu ◽  
Leilei Yang ◽  
...  
Keyword(s):  
Electromagnetic Interference ◽  
High Performance ◽  
Electronic Devices ◽  
Deposition Process ◽  
Shielding Effectiveness ◽  
Emi Shielding ◽  
Emi Shielding Effectiveness ◽  
X Band ◽  
Wearable Electronic Devices ◽  
Emi Se

AbstractLightweight, flexibility, and low thickness are urgent requirements for next-generation high-performance electromagnetic interference (EMI) shielding materials for catering to the demand for smart and wearable electronic devices. Although several efforts have focused on constructing porous and flexible conductive films or aerogels, few studies have achieved a balance in terms of density, thickness, flexibility, and EMI shielding effectiveness (SE). Herein, an ultrathin, lightweight, and flexible carbon nanotube (CNT) buckypaper enhanced using MXenes (Ti3C2Tx) for high-performance EMI shielding is synthesized through a facile electrophoretic deposition process. The obtained Ti3C2Tx@CNT hybrid buckypaper exhibits an outstanding EMI SE of 60.5 dB in the X-band at 100 μm. The hybrid buckypaper with an MXene content of 49.4 wt% exhibits an EMI SE of 50.4 dB in the X-band with a thickness of only 15 μm, which is 105% higher than that of pristine CNT buckypaper. Furthermore, an average specific SE value of 5.7 × 104 dB cm2 g−1 is exhibited in the 5-μm hybrid buckypaper. Thus, this assembly process proves promising for the construction of ultrathin, flexible, and high-performance EMI shielding films for application in electronic devices and wireless communications.

Flexible GnPs/EPDM with Excellent Thermal Conductivity and Electromagnetic Interference Shielding Properties

NANO ◽  
2019 ◽  
Vol 14 (06) ◽  
pp. 1950075 ◽  
Author(s):  
Shaowei Lu ◽  
Yaoyao Bai ◽  
Jijie Wang ◽  
Dandan Chen ◽  
Keming Ma ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Electromagnetic Interference ◽  
Rubber Matrix ◽  
Shielding Effectiveness ◽  
Emi Shielding ◽  
Emi Shielding Effectiveness ◽  
X Band ◽  
Cost Efficient ◽  
Emi Se ◽  
Shielding Material

As the portable device hardware has been increasing at a noticeable rate, ultrathin flexible materials with the combination of high thermal conductivity and excellent electromagnetic interference (EMI) shielding performance are urgently needed. Here, we fabricated ethylene propylene diene monomer rubber with different loading graphene nanoplatelets (GnPs/EPDM) by a cost-efficient approach, which combines mixing, ultrasonication and compression. Further investigation demonstrates that the 8[Formula: see text]wt.% GnPs/EPDM with only 0.3[Formula: see text]mm in thickness shows excellent electrical conductivity (28.3[Formula: see text]S/m), thermal conductivity (0.79[Formula: see text]W/m[Formula: see text]K) and good mechanical properties. Besides, the 8[Formula: see text]wt.% GnPs/EPDM exhibits an EMI shielding effectiveness (SE) up to 33[Formula: see text]dB in the X-band (8.2–12.4[Formula: see text]GHz) and 35[Formula: see text]dB in the Ku-band (12.4–18[Formula: see text]GHz), superior to most of the reported rubber matrix. Additionally, the GnPs/EPDM shows excellent flexibility and stability with 95% and 94% retention of EMI SE even after repeated bending for 5000 times and corrosion (under 5% NaCl environment) for a week. Our flexible EMI shielding material will benefit the fast-growing next-generation commercial portable flexible electrons.

A multi-dimensional and level-by-level assembly strategy for constructing flexible and sandwich-type nanoheterostructures for high-performance electromagnetic interference shielding

Nanoscale ◽  
2020 ◽  
Vol 12 (5) ◽  
pp. 3308-3316 ◽  
Author(s):  
Caichao Wan ◽  
Yue Jiao ◽  
Xianjun Li ◽  
Wenyan Tian ◽  
Jian Li ◽  
...  
Keyword(s):  
Electromagnetic Interference ◽  
High Performance ◽  
Shielding Effectiveness ◽  
Emi Shielding ◽  
Electromagnetic Interference Shielding ◽  
Free Standing ◽  
Assembly Strategy ◽  
Emi Shielding Effectiveness ◽  
X Band ◽  
Sandwich Type

A multi-dimensional and level-by-level assembly strategy is developed to construct free-standing and sandwich-type nanoheterostructures achieving an outstanding EMI shielding effectiveness of ∼50.6 dB in the X-band.

Graphene nanosheets/BaTiO3 ceramics as highly efficient electromagnetic interference shielding materials in the X-band

2016 ◽  
Vol 4 (2) ◽  
pp. 371-375 ◽  
Author(s):  
Qing Yuchang ◽  
Wen Qinlong ◽  
Luo Fa ◽  
Zhou Wancheng ◽  
Zhu Dongmei
Keyword(s):  
Electromagnetic Interference ◽  
High Performance ◽  
Graphene Nanosheets ◽  
Pressureless Sintering ◽  
Shielding Effectiveness ◽  
Emi Shielding ◽  
Electromagnetic Interference Shielding ◽  
Highly Efficient ◽  
Emi Shielding Effectiveness ◽  
X Band

Graphene nanosheets filled BaTiO3 ceramics with high-performance EMI shielding effectiveness, greater than 40 dB in the X-band at 1.5 mm thickness, were prepared via pressureless sintering.

Polyaniline-Stannous Oxide Composites: Novel Material for Broadband EMI Shielding

2012 ◽  
Vol 488-489 ◽  
pp. 557-561 ◽  
Author(s):  
Muhammad Faisal ◽  
Syed Khasim
Keyword(s):  
Electromagnetic Interference ◽  
Chemical Oxidation ◽  
Shielding Effectiveness ◽  
Emi Shielding ◽  
Practical Applications ◽  
Stannous Oxide ◽  
Emi Shielding Effectiveness ◽  
X Band ◽  
Potential Applications ◽  
Emi Se

Insitu polymerization of aniline was carried out in the presence of stannous oxide (SnO) to synthesize Polyaniline (PAni)/SnO composites by chemical oxidation method. The surface morphology of the composites were studied by scanning electron microscopy (SEM).The electromagnetic interference (EMI) shielding properties of the composites were investigated for different wt % of SnO (10,20,30,40 and 50 wt%) in PAni. The EMI measurements were carried out in the frequency range from 8.2 to 12.4 GHz (X-band), which is relevant for practical applications. EMI shielding effectiveness (EMI SE), microwave absorption and reflection, the influence of SnO concentration in PAni on EMI SE of the composites are reported. The composites exhibit EMI SE value of -18 to -23 dB. The absorption dominated EMI SE of these composites indicates the potential applications of these materials for microwave attenuation in the X-band.

scholarly journals Carbonization of Graphene-Doped Isocyanate-Based Polyimide Foams to Achieve Carbon Foams with Excellent Electromagnetic Interference Shielding Performance

Materials ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 7551
Author(s):  
Hui Jing ◽  
Zongnan Miao ◽  
Zhong Zeng ◽  
Hui Liu ◽  
Shengtai Zhou ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Electromagnetic Interference ◽  
Carbonization Temperature ◽  
Shielding Effectiveness ◽  
Emi Shielding ◽  
Emi Shielding Effectiveness ◽  
Graphitization Degree ◽  
Carbon Foams ◽  
Potential Applications ◽  
Emi Se

Lightweight carbon foams with excellent electromagnetic interference (EMI) shielding performance were prepared by carbonization process, using isocyanate-based polyimide foams as carbon precursors. The influence of carbonization temperature and graphene-doping on the morphological, electrical and EMI shielding effectiveness (SE) of corresponding carbon foams was studied in detail. Results showed that the addition of graphene was beneficial to the improvement of electrical conductivity and EMI shielding performance of carbon foams. The electrical conductivity of carbon foams increased with the carbonization temperature which was related to the increase of graphitization degree. Collapse of foam cells was observed at higher carbonization temperatures, which was detrimental to the overall EMI SE. The optimal carbonization temperature was found at 1100 °C and the carbon foams obtained from 0.5 wt% graphene-doped foams exhibited a specific EMI SE of 2886 dB/(g/cm3), which shows potential applications in fields such as aerospace, aeronautics and electronics.

Researching on X-Band Electromagnetic Interference Shielding Efficiency of MWCNTs Buckypapers Inserted with Mn Nanopowder

NANO ◽  
2018 ◽  
Vol 13 (06) ◽  
pp. 1850061 ◽  
Author(s):  
Shaowei Lu ◽  
Yaoyao Bai ◽  
Jijie Wang ◽  
Chenxu Zhao ◽  
Wei Li ◽  
...  
Keyword(s):  
Electromagnetic Interference ◽  
Energy Dispersive Spectrometer ◽  
Composite Films ◽  
Resin Matrix ◽  
Manufacturing Cost ◽  
Shielding Effectiveness ◽  
Emi Shielding ◽  
Filtration Method ◽  
Emi Shielding Effectiveness ◽  
X Band

Ultrathin multi-walled carbon nanotubes (MWCNTs) buckypapers inserted with Mn nanopowder were fabricated via vacuum filtration method, at a lower manufacturing cost and easier operation. The buckypapers were characterized structurally using scanning electron microscopy, energy-dispersive spectrometer and X-ray diffraction. Electromagnetic interference (EMI) shielding effectiveness (SE) of MWCNTs buckypapers inserted with Mn nanopowder (0–30[Formula: see text]wt.%) were tested in X-band (8.2–12.4[Formula: see text]GHz). When the blended Mn nanopowder content is 20[Formula: see text]wt.%, the buckypaper exhibits much higher EMI SE of average value up to 42[Formula: see text]dB with the thickness of only 0.11[Formula: see text]mm. Further, this buckypaper is flexible and lightweight, and can be integrated with resin matrix composites. Thus, the results and techniques promise a simple and effective approach to achieve lightweight and ultrathin composite films for a wide application prospect in the field of EMI shielding and microwave absorption.

Lightweight and flexible hybrid film based on delicate design of electrospun nanofibers for high-performance electromagnetic interference shielding

Nanoscale ◽  
2019 ◽  
Vol 11 (17) ◽  
pp. 8616-8625 ◽  
Author(s):  
Li Huang ◽  
Jianjun Li ◽  
Yibin Li ◽  
Xiaodong He ◽  
Ye Yuan
Keyword(s):  
Electromagnetic Interference ◽  
High Performance ◽  
Hybrid Film ◽  
Electrospun Nanofibers ◽  
Light Weight ◽  
Shielding Effectiveness ◽  
Emi Shielding ◽  
Electromagnetic Interference Shielding ◽  
Emi Shielding Effectiveness

High-performance electromagnetic interference (EMI) shielding materials possess features of light weight, flexibility and excellent EMI shielding effectiveness.

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

RSC Advances ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 1419-1427 ◽  
Author(s):  
Shaofeng Lin ◽  
Su Ju ◽  
Jianwei Zhang ◽  
Gang Shi ◽  
Yonglyu He ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Graphene Oxide ◽  
Electromagnetic Interference ◽  
Electronic Devices ◽  
High Thermal Conductivity ◽  
Shielding Effectiveness ◽  
Emi Shielding ◽  
Emi Shielding Effectiveness ◽  
Graphene Films ◽  
Thermal Conducting

As the demand for wearable and foldable electronic devices increases rapidly, ultrathin and flexible thermal conducting films with exceptional electromagnetic interference (EMI) shielding effectiveness (SE) are greatly needed.

scholarly journals Layer-Structured Design and Fabrication of Cyanate Ester Nanocomposites for Excellent Electromagnetic Shielding with Absorption-Dominated Characteristic

Polymers ◽  
2018 ◽  
Vol 10 (9) ◽  
pp. 933 ◽  
Author(s):  
Fang Ren ◽  
Zheng-Zheng Guo ◽  
Han Guo ◽  
Li-Chuan Jia ◽  
Yu-Chen Zhao ◽  
...  
Keyword(s):  
Electromagnetic Interference ◽  
Electromagnetic Waves ◽  
Graphene Nanosheets ◽  
Magnetic Loss ◽  
Multilayered Structure ◽  
Shielding Effectiveness ◽  
Emi Shielding ◽  
Emi Shielding Effectiveness ◽  
Wave Transport ◽  
Emi Se

In this work, we propose novel layer-structured polymer composites (PCs) for manipulating the electromagnetic (EM) wave transport, which holds unique electromagnetic interference (EMI) shielding features. The as-prepared PCs with a multilayered structure exhibits significant improvement in overall EMI shielding effectiveness (EMI SE) by adjusting the contents and distribution of electrical and magnetic loss fillers. The layer-structured PCs with low nanofiller content (5 wt % graphene nanosheets (GNSs) and 15 wt % Fe3O4) and a thickness of only 2 mm exhibited ultrahigh electrical conductivity and excellent EMI SE, reaching up to 2000 S/m and 45.7 dB in the X-band, respectively. The increased EMI SE of the layer-structured PCs was mainly based on the improved absorption rather than the reflection of electromagnetic waves, which was attributed to the “absorb-reflect-reabsorb” process for the incident electromagnetic waves. This work may provide a simple and effective approach to achieve new EMI shielding materials, especially for absorption-dominated EMI shielding.

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