scholarly journals Transparent Electromagnetic Shielding Film Utilizing Imprinting-Based Micro Patterning Technology

Polymers ◽  
2021 ◽  
Vol 13 (5) ◽  
pp. 738
Author(s):  
Hyun-Seok Choi ◽  
Su-Jeong Suh ◽  
Sang-Woo Kim ◽  
Hyun-Joong Kim ◽  
Ji-Won Park
Keyword(s):  
Electromagnetic Interference ◽  
Electromagnetic Waves ◽  
Emi Shielding ◽  
Aperture Ratio ◽  
Component Integration ◽  
Micro Patterning ◽  
Mobile Industry ◽  
Smart Mobile ◽  
Conductive Particles ◽  
Shielding Material

Utilization of methods involving component integration has accelerated, owing to the growth of the smart mobile industry. However, this integration leads to interference issues between the components, thereby elucidating the importance of the electromagnetic interference (EMI) shielding technology to solve such issues. EMI shielding technology has been previously implemented via the reflection or absorption of electromagnetic waves by using conductive materials. Nevertheless, to tackle the recent changes in the industry, a transparent and flexible EMI shielding technology is necessitated. In this study, a transparent and flexible EMI shielding material was fabricated by filling a conductive binder in a film comprising an intaglio pattern; this was achieved by using the ultraviolet (UV) imprinting technology to realize mass production. Subsequently, changes in the aperture ratio and shielding characteristics were analyzed according to the structure of the pattern. Based on this analysis, a square pattern was designed and a film with an intaglio pattern was developed through a UV imprinting process. Furthermore, it was confirmed that the transmittance, conductivity, and EMI shielding rate of the film were altered while changing the coating thickness of the conductive particles in the intaglio pattern. The final film prepared in this study exhibited characteristics that satisfied the required EMI shielding performance for electric and electronic applications, while achieving flexible structural stability and transparency.

Plasmolysis-inspired Yolk-Shell Hydrogel-core@Void@MXene-shell Microspheres with Strong Electromagnetic Interference Shielding Performance

2021 ◽  
Author(s):  
Chenxi Li ◽  
Xingxing Ni ◽  
Yang Lei ◽  
Shangyang Li ◽  
Bo You ◽  
...  
Keyword(s):  
Electromagnetic Interference ◽  
Electromagnetic Waves ◽  
Multilayered Structure ◽  
Electromagnetic Shielding ◽  
Electromagnetic Interference Shielding ◽  
Shielding Material

Benefiting from specific multilayered structure, yolk−shell microspheres with void spaces are considered as the promising electromagnetic shielding material which does well in enhancing the decay of electromagnetic waves. Commonly reported...

Fabrication and characterization of organic semiconductor for electromagnetic interference shielding material

2011 ◽  
Vol 31 (4) ◽  
Author(s):  
Habibun Nabi Muhammad Ekramul Mahmud ◽  
Anuar Kassim
Keyword(s):  
Conducting Polymer ◽  
Polymer Composite ◽  
Indium Tin Oxide ◽  
Electromagnetic Interference ◽  
Composite Films ◽  
Oxide Glass ◽  
Poly Vinyl Alcohol ◽  
Shielding Effectiveness ◽  
Emi Shielding ◽  
Shielding Material

Abstract Conducting polymer films produced by electropolymerization technique are highly conductive, simple, and suitable for use especially in electronic devices. An attempt has been made to produce polypyrrole-poly(vinyl alcohol) (PPy-PVA) conducting polymer composite films using 0.1 m p-toluene sulfonate dopant at a potential of 1.2 V (vs. standard calomel electrode) on indium tin oxide glass electrode. The potential application of the prepared PPy-PVA conducting polymer composite films as an electromagnetic interference (EMI) shielding material has been investigated in the present study. The EMI shielding effectiveness of PPy-PVA composite films prepared from different experimental conditions was analyzed in the microwave frequency range of 8–12 GHz. The shielding effectiveness of 45.67–35.7 dB has been demonstrated by PPy-PVA conducting polymer composite films, which appears to be very attractive in any EMI shielding applications where a minimum shielding effectiveness of 35 dB is required.

Ultrathin graphene: electrical properties and highly efficient electromagnetic interference shielding

2015 ◽  
Vol 3 (26) ◽  
pp. 6589-6599 ◽  
Author(s):  
Mao-Sheng Cao ◽  
Xi-Xi Wang ◽  
Wen-Qiang Cao ◽  
Jie Yuan
Keyword(s):  
Electrical Properties ◽  
Information Security ◽  
Rapid Growth ◽  
Electromagnetic Interference ◽  
Electromagnetic Waves ◽  
Electronic Devices ◽  
Strong Absorption ◽  
Emi Shielding ◽  
Electromagnetic Interference Shielding ◽  
Electromagnetic Pollution

Ultrathin graphene, a 2D material, demonstrates outstanding features and rapid growth for EMI shielding due to its strong absorption towards electromagnetic waves in composites. It is sought after for communication, electronic devices, information security, electromagnetic pollution defense and healthcare.

scholarly journals Simulation and Optimization of Electromagnetic Absorption of Polycarbonate/CNT Composites Using Machine Learning

Micromachines ◽  
2020 ◽  
Vol 11 (8) ◽  
pp. 778
Author(s):  
Lakhdar Sidi Salah ◽  
Mohamed Chouai ◽  
Yann Danlée ◽  
Isabelle Huynen ◽  
Nassira Ouslimani
Keyword(s):  
Electromagnetic Interference ◽  
Electromagnetic Waves ◽  
Electronic Devices ◽  
Target Material ◽  
Building Blocks ◽  
Microwave Range ◽  
Emi Shielding ◽  
Calculation Time ◽  
Simulation And Optimization ◽  
Electromagnetic Absorption

Electronic devices that transmit, distribute, or utilize electrical energy create electromagnetic interference (EMI) that can lead to malfunctioning and degradation of electronic devices. EMI shielding materials block the unwanted electromagnetic waves from reaching the target material. EMI issues can be solved by using a new family of building blocks constituted of polymer and nanofillers. The electromagnetic absorption index of this material is calculated by measuring the “S-parameters”. In this article, we investigated the use of artificial intelligence (AI) in the EMI shielding field by developing a new system based on a multilayer perceptron neural network designed to predict the electromagnetic absorption of polycarbonate-carbon nanotubes composites films. The proposed system included 15 different multilayer perception (MLP) networks; each network was specialized to predict the absorption value of a specific category sample. The selection of appropriate networks was done automatically, using an independent block. Optimization of the hyper-parameters using hold-out validation was required to ensure the best results. To evaluate the performance of our system, we calculated the similarity error, precision accuracy, and calculation time. The results obtained over our database showed clearly that the system provided a very good result with an average accuracy of 99.7997%, with an overall average calculation time of 0.01295 s. The composite based on polycarbonate−5 wt.% carbon nanotube was found to be the ultimate absorber over microwave range according to Rozanov formalism.

Layer-structured silver nanowire/polyaniline composite film as a high performance X-band EMI shielding material

2016 ◽  
Vol 4 (19) ◽  
pp. 4193-4203 ◽  
Author(s):  
Fang Fang ◽  
Yuan-Qing Li ◽  
Hong-Mei Xiao ◽  
Ning Hu ◽  
Shao-Yun Fu
Keyword(s):  
Electrical Conductivity ◽  
Electromagnetic Interference ◽  
High Performance ◽  
Composite Films ◽  
Silver Nanowire ◽  
Emi Shielding ◽  
Electromagnetic Interference Shielding ◽  
X Band ◽  
Pani Composite ◽  
Shielding Material

The superiority of layer-structured Ag-NW/PANI composite films over the plain-structured in electrical conductivity and electromagnetic interference shielding.

Fabrication of magnetite nanoparticles/polyvinylpyrrolidone composite nanofibers and their application as electromagnetic interference shielding material

2017 ◽  
Vol 31 (4) ◽  
pp. 431-446 ◽  
Author(s):  
Komeil Nasouri ◽  
Ahmad Mousavi Shoushtari
Keyword(s):  
Electrical Conductivity ◽  
Electromagnetic Interference ◽  
Composite Nanofibers ◽  
Electrospun Nanofibers ◽  
Emi Shielding ◽  
Frequency Range ◽  
Electromagnetic Interference Shielding ◽  
Nanoparticles Concentration ◽  
Shielding Material ◽  
Scanning Electron

Magnetite (Fe3O4) nanoparticles/polyvinylpyrrolidone (PVP) composite nanofibers (FCNFs) have been fabricated to evaluate the potential of FCNFs as electromagnetic interference (EMI) shielding material in the frequency range of 8.2–12.4 GHz. The scanning electron microscope and viscosity analyses confirmed the presence of good dispersion Fe3O4 nanoparticles encapsulated within the electrospun nanofibers and showed FCNF morphologies with diameters of 150–500 nm. The magnetic properties and electrical conductivity of FCNFs were found to be dependent on Fe3O4 nanoparticles concentration and showed an increase with increasing Fe3O4 nanoparticles loading. The EMI shielding efficiency of FCNFs increased up to approximately 22 dB. The EMI shielding results for FCNFs showed that absorption was the major shielding mechanism and reflection was the secondary shielding mechanism. The present study has shown the possibility of utilizing magnetic FCNFs as EMI shielding/absorption materials.

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.

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.

Electromagnetic interference shielding with absorption-dominant performance of Ti3C2TX MXene/non-woven laminated fabrics

2021 ◽  
pp. 004051752110062
Author(s):  
Hengyu Zhang ◽  
Jianying Chen ◽  
Hui Ji ◽  
Ni Wang ◽  
Shuo Feng ◽  
...  
Keyword(s):  
Electromagnetic Interference ◽  
Calcium Alginate ◽  
Electromagnetic Waves ◽  
Woven Fabrics ◽  
Shielding Effectiveness ◽  
Emi Shielding ◽  
Substrate Type ◽  
Fabric Thickness ◽  
Heterogeneous Interfaces ◽  
Thickness Layer

Electromagnetic interference (EMI)-shielding materials with remarkable shielding effectiveness (SE) based on dominant absorption are highly desirable, especially if they are also flexible and lightweight. Herein, we prepared MXene (Ti3C2TX, TX-=O,-OH,-F)-based lightweight and absorption-dominant EMI-shielding non-woven fabrics. In view of the porosity and soft properties of textiles, as well as the unique high conductivity and hydrophilicity of Ti3C2TX MXene, Ti3C2TX MXene was coated on the fiber skeleton of three different non-woven fabrics made from polyester, cotton, and calcium alginate. The conductive layer formed by Ti3C2TX MXene on the fiber led to heterogeneous interfaces. They improved the multiple reflection of electromagnetic waves among Ti3C2TX MXene sheets and then contributed to the attenuation of the electromagnetic waves. Among all the samples, calcium alginate/Ti3C2TX MXene reached a maximum SE of 25.26 dB at 12.4 GHz with the fabric thickness of 3.17 mm. Cotton/Ti3C2TX MXene achieved maximum SSEt (ratio of specific shielding effectiveness (SSE) to thickness) of 2301.95 dB cm2g−1 at 1.36 mm with a loading of Ti3C2TX MXene of only 5.77mg/cm3. Further, fabric thickness, layer number, conductivity, and substrate type were selected to analyze the EMI-shielding mechanism.

Medical Building Materials of Structural Properties and Electromagnetic Interference Shielding in the Quartz Crystal Plane Coated Ni Based Thin Film

2014 ◽  
Vol 599-601 ◽  
pp. 67-76
Author(s):  
Fei Shuo Hung
Keyword(s):  
Thin Film ◽  
Electromagnetic Interference ◽  
High Frequency ◽  
Electromagnetic Waves ◽  
Building Materials ◽  
Electromagnetic Shielding ◽  
Shielding Effect ◽  
Coating Film ◽  
Emi Shielding ◽  
Electromagnetic Interference Shielding

Medical use quartz components for electromagnetic shielding materials research topics very rarely, therefore, intend to systematic development of coated quartz glass materials. The considerations for against electromagnetic waves (Electromagnetic Interference Shielding, EMI), one conductive coating film is required. The anti-high-frequency electromagnetic waves also need magnetic coating film. The thin film is translucent with a poor crystallinity, must be heat-treated to have good crystallization and conductivity, and therefore finds the feasible of Ni-based coating and interface effects also have the academic importance. This program is to deposit Ni-based thin film on different quartz planes (Ni/SiO2), and explores the effect of heat treatment on the structure. That contains crystalline characteristics (doping concentration: the Ni-base matrix doping Fe, 10at%~ 50at.%), optical properties and electrical conductivity. Finally, the electromagnetic shielding effect (EMI) of the coating structure is assessed. So, the application data for the characteristics of interface layer and anti-electromagnetic (EMI) properties are obtained. building materials extended to the health care system materials systems. The results show that Sn-40Al-xNi film increased the electromagnetic interference (EMI) shielding after annealed. For the Sn-40Al-10Ni films with higher Ni atomic concentration, the low frequency EMI shielding could be improved. For the sputtering films the annealed treatment not only had higher electric conductivity but also increased the high frequency EMI shielding.

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