Asymmetric conductive polymer composite foam for absorption dominated ultra-efficient electromagnetic interference shielding with extremely low reflection characteristics

2020 ◽  
Vol 8 (18) ◽  
pp. 9146-9159 ◽  
Author(s):  
Hongji Duan ◽  
Huixin Zhu ◽  
Jiefeng Gao ◽  
Ding-Xiang Yan ◽  
Kun Dai ◽  
...  
Keyword(s):  
Network Design ◽  
Polymer Composite ◽  
Electromagnetic Interference ◽  
Conductive Polymer ◽  
Conductive Network ◽  
Emi Shielding ◽  
Electromagnetic Interference Shielding ◽  
Composite Foam ◽  
Conductive Polymer Composite ◽  
Reflection Characteristics

An ultraefficient EMI shielding WPU composite foam with extremely low reflection is achieved via ingenious asymmetric conductive network design.

Effects of conductive polymer composite layering on EMI shielding during additive manufacturing

MRS Advances ◽  
2019 ◽  
Vol 4 (38-39) ◽  
pp. 2153-2159 ◽  
Author(s):  
Eugene Zakar ◽  
Theodore Anthony ◽  
Madan Dubey
Keyword(s):  
Additive Manufacturing ◽  
Polymer Composite ◽  
Electromagnetic Interference ◽  
Conductive Polymer ◽  
Cumulative Effects ◽  
Shielding Effectiveness ◽  
Emi Shielding ◽  
Drying Time ◽  
Conductive Polymer Composite ◽  
Composite Layers

Abstract:Spin coating and drop casting are viable methods for rapid and low-cost additive manufacturing of components for flexible devices and sensors. We investigated the cumulative effects of layering a conductive polymer composite 2 wt% MWCNT filler in PEDOT:PSS on a Mylar substrate for application to electromagnetic interference (EMI) shielding. The optical transmittace of spin coated composite layers is 90%, 45%, and 20% with a thickness of 0.05 µm, 0.15 µm, and 0.45 µm respectively. Drop cast composite layers have 0% transmittance due to their much greater starting thickness of 4.4 µm. The addition of isopropyl alcohol (IPA) to the solution mixture and substrate heating to 40 °C improves the conductivity, and drying time of the cured composite layers to 10 min. This study shows that the cumulative effects of composite layering are additive, but the electrical properties do not scale the same way. A significant increase in the EMI SE is mainly attributed to the enhanced electrical conductivity of the composite. The insertion of a 50 µm gap in between two 15 µm composite layers accentuates the EMI shielding effectiveness (SE) significantly to a peak of 21 dB within a narrow frequency range in the Ku-band tested.

scholarly journals Modelling of Rod-Like Fillers’ Rotation and Translation near Two Growing Cells in Conductive Polymer Composite Foam Processing

Polymers ◽  
2018 ◽  
Vol 10 (3) ◽  
pp. 261 ◽  
Author(s):  
Sai Wang ◽  
Amir Ameli ◽  
Vahid Shaayegan ◽  
Yasamin Kazemi ◽  
Yifeng Huang ◽  
...  
Keyword(s):  
Polymer Composite ◽  
Conductive Polymer ◽  
Composite Foam ◽  
Conductive Polymer Composite

scholarly journals Dependence of electromagnetic interference shielding ability of conductive polymer composite foams with hydrophobic properties on cellular structure

2020 ◽  
Vol 8 (22) ◽  
pp. 7401-7410 ◽  
Author(s):  
Biao Zhao ◽  
Ruoming Wang ◽  
Yang Li ◽  
Yumei Ren ◽  
Xiao Li ◽  
...  
Keyword(s):  
Polymer Composites ◽  
Electromagnetic Interference ◽  
Cellular Structure ◽  
Conductive Polymer ◽  
Emi Shielding ◽  
Electromagnetic Interference Shielding ◽  
Hydrophobic Properties ◽  
Conductive Polymer Composites ◽  
Composite Foams ◽  
Shielding Properties

The introduction of a cellular structure in conductive polymer composites is supposed to be an effective way to ameliorate the electromagnetic interference (EMI) shielding properties.

Three-dimensional and highly ordered porous carbon–MnO2 composite foam for excellent electromagnetic interference shielding efficiency

RSC Advances ◽  
2016 ◽  
Vol 6 (103) ◽  
pp. 100713-100722 ◽  
Author(s):  
Pinki Rani Agarwal ◽  
Rajeev Kumar ◽  
Saroj Kumari ◽  
Sanjay R. Dhakate
Keyword(s):  
Porous Carbon ◽  
Electromagnetic Interference ◽  
Three Dimensional ◽  
High Strength ◽  
Carbon Matrix ◽  
Carbon Foam ◽  
Emi Shielding ◽  
Electromagnetic Interference Shielding ◽  
Composite Foam ◽  
Ordered Porous

The combination with MnO2 nanoparticles in carbon matrix, the carbon foam exhibit absorption dominating specific EMI shielding value of −150 dB cm3 g−1 with high strength of 7.8 MPa.

EMI Shielding Effectiveness of CNTs Composites

2013 ◽  
Vol 331 ◽  
pp. 439-442 ◽  
Author(s):  
Ping Li ◽  
Aik Seng Low ◽  
Yue Yan Shan ◽  
Guat Choon Ong ◽  
Xi Jiang Yin
Keyword(s):  
Carbon Nanotubes ◽  
Electromagnetic Interference ◽  
Conductive Network ◽  
Shielding Effectiveness ◽  
Emi Shielding ◽  
Frequency Range ◽  
Electromagnetic Interference Shielding ◽  
Emi Shielding Effectiveness ◽  
Electromagnetic Interference Shielding Effectiveness ◽  
5 Ghz

A carbon nanotubes (CNTs) composite and its electromagnetic interference shielding effectiveness (SE) were investigated. Its absorptance, reflectance and shielding effectiveness (SE) were analysed. The CNTs composite has a shielding effectiveness (SE) of more than 25 dB (>99.68%) in frequency range from 30 MHz to 5 GHz. The testing results also demonstrate that the shielding mechanism of the CNTs composite is mainly EMI absorption of electromagnitic radiation. The high SE of the CNTs composite in the study is attributed to a high aspect ratio (>3000) and good conductive network of CNTs within the composite.

Tailoring Ti3C2Txnanosheets to tune local conductive network as an environmentally friendly material for highly efficient electromagnetic interference shielding

Nanoscale ◽  
2019 ◽  
Vol 11 (13) ◽  
pp. 6080-6088 ◽  
Author(s):  
Peng He ◽  
Xi-Xi Wang ◽  
Yong-Zhu Cai ◽  
Jin-Cheng Shu ◽  
Quan-Liang Zhao ◽  
...  
Keyword(s):  
Layer Thickness ◽  
Electromagnetic Interference ◽  
High Performance ◽  
Environmentally Friendly ◽  
Atomic Layer ◽  
Conductive Network ◽  
Emi Shielding ◽  
Electromagnetic Interference Shielding ◽  
Highly Efficient

Atomic layer tailoring (ALT) the layer thickness of Ti3C2TxMXenes to induce the formation of a local conductive network, as an environmentally friendly material for high-performance EMI shielding.

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