Electromagnetic Interference Shielding Effectiveness of Room Temperature Fabricated Manganese Dioxide/Carbon Dots Nanocomposites

The present work is focused on the fabrication of manganese dioxide/carbon dots (MnO2/CDs) nanocomposites at room temperature in situ co-participation method in an aqueous medium and characterized. Our study showed that the concentration of CDs controls the morphology of MnO2/CDs nanocomposite and also acted as a reducing agent to convert potassium permanganate (KMnO4) to MnO2. Subsequently, nanoflowers, quasi-spherical particles, broken, and interconnected chain type of morphology was observed by adding dispersion of 0.5, 1.0, 1.5, and 2.0 ml CDs in acetone to 1 mmol KMnO4 aqueous solution in the corresponding MnO2/CDs-0.5, MnO2/CDs-1.0, MnO2/CDs-1.5, and MnO2/CDs-2.0 composites, respectively. A plausible mechanism on the transformation of morphology of MnO2/CDs with CDs concentration is also provided. Further, the present work also focused for the first time on the application in the electromagnetic interference (EMI) shielding of MnO2/CD nanocomposites due to the high dielectric and conductivity. Interestingly, MnO2/CDs-2.0 (nanochains) exhibited the highest total EMI shielding efficiency (SET) of ~39.4 dB following reflection as dominant shielding mechanism due to the high aspect ratio, highest conductivity, high dielectric loss, and impendence mismatch.

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Electromagnetic interference shielding effectiveness of polypyrrole-silver nanocomposite films on silane-modified flexible sheet

High Performance Polymers ◽

10.1177/09540083211064535 ◽

2021 ◽

pp. 095400832110645

Author(s):

Karim Benzaoui ◽

Achour Ales ◽

Ahmed Mekki ◽

Abdelhalim Zaoui ◽

Boudjemaa Bouaouina ◽

...

Keyword(s):

Surface Treatment ◽

Electromagnetic Interference ◽

Nanocomposite Films ◽

Electrical Characteristics ◽

Shielding Effectiveness ◽

Emi Shielding ◽

Electromagnetic Interference Shielding ◽

Silver Nanocomposite ◽

Electromagnetic Interference Shielding Effectiveness ◽

Emi Se

The conventional electromagnetic interference (EMI) shielding materials are being gradually replaced by a new generation of supported conducting polymer composites (CPC) films due to their many advantages. This work presents a contribution on the effects of silane surface–modified flexible polypyrrole-silver nanocomposite films on the electromagnetic interference shielding effectiveness (EMI-SE). Thus, the UV-polymerization was used to in-situ deposit the PPy-Ag on the biaxial oriented polyethylene terephthalate (BOPET) flexible substrates whose surfaces were treated by 3-aminopropyltrimethoxysilane (APTMS). X-ray Photoelectron Spectroscopy (XPS) analyzes confirmed the APTMS grafting procedure. Structural, morphological, thermal, and electrical characteristics of the prepared films were correlated to the effect of substrate surface treatment. Thereafter, EMI-SE measurements of the elaborated films were carried out as per ASTM D4935 standard for a wide frequency band extending from 50 MHz to 18 GHz. The obtained results confirmed that the APTMS-treated BOPET film exhibit higher EMI shielding performance and better electrical characteristics compared to the untreated film. In fact, a 32% enhancement of EMI-SE was noted for the treated films compared to the untreated ones. Overall, these results put forward the role played by the surface treatment in strengthening the position of flexible PPy-Ag supported films as high-performance materials in electronic devices and electromagnetic interference shielding applications.

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Facile fabrication of ultrathin graphene film with ultrahigh electrical conductivity and superb electromagnetic interference shielding effectiveness

Journal of Materials Chemistry C ◽

10.1039/d0tc04576d ◽

2021 ◽

Vol 9 (1) ◽

pp. 214-222

Author(s):

Xiaojing Liu ◽

Wenyu Wu ◽

Bin Guo ◽

Minghao Cui ◽

Huaxin Ma ◽

...

Keyword(s):

Electrical Conductivity ◽

Self Assembly ◽

Electromagnetic Interference ◽

Graphene Film ◽

Shielding Effectiveness ◽

Emi Shielding ◽

Electromagnetic Interference Shielding ◽

Graphene Films ◽

Facile Fabrication ◽

Electromagnetic Interference Shielding Effectiveness

Graphene films prepared through a self-assembly of graphene oxide and its derivatives have been recently explored for electromagnetic interference (EMI) shielding applications.

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Flexible few-layered graphene/poly vinyl alcohol composite sheets: synthesis, characterization and EMI shielding in X-band through the absorption mechanism

RSC Advances ◽

10.1039/c5ra04038h ◽

2015 ◽

Vol 5 (46) ◽

pp. 36498-36506 ◽

Cited By ~ 20

Author(s):

Sandeep K. Marka ◽

Bashaiah Sindam ◽

K. C. James Raju ◽

Vadali V. S. S. Srikanth

Keyword(s):

Electromagnetic Interference ◽

Vinyl Alcohol ◽

Poly Vinyl Alcohol ◽

Shielding Effectiveness ◽

Emi Shielding ◽

Electromagnetic Interference Shielding ◽

Composite Sheet ◽

Absorption Mechanism ◽

X Band ◽

Electromagnetic Interference Shielding Effectiveness

An excellent electromagnetic interference shielding effectiveness of ∼19.5 dB was measured for a 1 mm thick flexible few-layered graphene (FLG)/PVA composite sheet owing to the formation of network-like features by FLG in the PVA matrix.

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Outstanding electromagnetic interference shielding effectiveness of polyvinylbutyral–polyaniline nanocomposite film

RSC Advances ◽

10.1039/c6ra14277j ◽

2016 ◽

Vol 6 (82) ◽

pp. 79058-79065 ◽

Cited By ~ 25

Author(s):

Pritom J. Bora ◽

Gaurav Lakhani ◽

Praveen C. Ramamurthy ◽

Giridhar Madras

Keyword(s):

Electromagnetic Interference ◽

Nanocomposite Film ◽

Shielding Effectiveness ◽

Emi Shielding ◽

Electromagnetic Interference Shielding ◽

Solution Processed ◽

X Band ◽

Electromagnetic Interference Shielding Effectiveness ◽

Polyaniline Nanocomposite ◽

Ku Band

In this study, we studied the electromagnetic interference (EMI) shielding property of a solution processed polyvinylbutyral–polyaniline nanocomposite (PVBPN) film in the X-band (8.2–12.4 GHz) and Ku-band (12.4–18 GHz) frequency.

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Mesocarbon microsphere composites with Fe3O4 nanoparticles for outstanding electromagnetic interference shielding effectiveness

RSC Advances ◽

10.1039/c5ra03332b ◽

2015 ◽

Vol 5 (54) ◽

pp. 43279-43289 ◽

Cited By ~ 23

Author(s):

Ridham Dhawan ◽

Saroj Kumari ◽

Rajeev Kumar ◽

S. K. Dhawan ◽

Sanjay R. Dhakate

Keyword(s):

Fe3o4 Nanoparticles ◽

Electromagnetic Interference ◽

Shielding Effectiveness ◽

Emi Shielding ◽

Electromagnetic Interference Shielding ◽

Emi Shielding Effectiveness ◽

Electromagnetic Interference Shielding Effectiveness

In situ, development of mesocarbon microsphere (MCMS) composites with magnetic Fe3O4 nanoparticles for outstanding electromagnetic (EMI) shielding effectiveness.

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Effect of Hollow Structure on the Electromagnetic Interfering (EMI) Shielding of Aluminum-Cenospheres Composites

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.97-101.1760 ◽

2010 ◽

Vol 97-101 ◽

pp. 1760-1763

Author(s):

Xiao Li Huang ◽

Gao Hui Wu

Keyword(s):

Electromagnetic Interference ◽

Pure Aluminum ◽

Hollow Structure ◽

Coaxial Cable ◽

Shielding Effectiveness ◽

Emi Shielding ◽

Multiple Reflections ◽

The Common ◽

Aluminum Alloy 2024 ◽

Electromagnetic Interference Shielding Effectiveness

The electromagnetic interference shielding effectiveness (EMISE) properties are measured using coaxial cable method in the frequency range of 10 -1200MHz. EMI analysis indicates EMISE properties of these three types of composites is mainly influenced by the hollow structure of cenospheres, suggesting the common effects of reflection and multiple reflections mechanisms. On the other hand, the change of matrix from pure aluminum (1199) to aluminum alloy (2024) on EMISE properties can be negligible.

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EMI Shielding Effectiveness of CNTs Composites

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.331.439 ◽

2013 ◽

Vol 331 ◽

pp. 439-442 ◽

Cited By ~ 1

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.

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The electromagnetic interference shielding effectiveness of high aspect-ratio SiC nanofibers/epoxy composites

RSC Advances ◽

10.1039/c5ra16007c ◽

2015 ◽

Vol 5 (113) ◽

pp. 93499-93506 ◽

Cited By ~ 10

Author(s):

Yi Zhang ◽

Zhou Wang ◽

Boliang Zhang ◽

Guang-Lin Zhao ◽

S. M. Guo

Keyword(s):

Silicon Carbide ◽

Aspect Ratio ◽

High Aspect Ratio ◽

Electromagnetic Interference ◽

Epoxy Composites ◽

Shielding Effectiveness ◽

Emi Shielding ◽

Electromagnetic Interference Shielding ◽

Emi Shielding Effectiveness ◽

Electromagnetic Interference Shielding Effectiveness

Silicon carbide nano-fibers with high aspect ratio improve the EMI shielding effectiveness of epoxy at low concentration.

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Constructing interconnected spherical hollow conductive networks in silver platelets/reduced graphene oxide foam/epoxy nanocomposites for superior electromagnetic interference shielding effectiveness

Nanoscale ◽

10.1039/c9nr06022g ◽

2019 ◽

Vol 11 (46) ◽

pp. 22590-22598 ◽

Cited By ~ 36

Author(s):

Chaobo Liang ◽

Ping Song ◽

Hua Qiu ◽

Yali Zhang ◽

Xiangteng Ma ◽

...

Keyword(s):

Graphene Oxide ◽

Reduced Graphene Oxide ◽

Electromagnetic Interference ◽

Shielding Effectiveness ◽

Emi Shielding ◽

Electromagnetic Interference Shielding ◽

Reduced Graphene ◽

Electrical Conductivities ◽

Electromagnetic Interference Shielding Effectiveness ◽

Spherical Hollow

How to significantly increase electromagnetic interference (EMI) shielding performances by improving electrical conductivities is still a serious challenge.

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Impedance analysis and electromagnetic interference shielding effectiveness of vapor grown carbon nanofiber reinforced chlorobutyl rubber composites

e-Polymers ◽

10.1515/epoly.2008.8.1.496 ◽

2008 ◽

Vol 8 (1) ◽

Cited By ~ 2

Author(s):

V. Sridhar ◽

Deng Xu ◽

D.K. Tripathy ◽

Jin Kuk Kim

Keyword(s):

Polymer Matrix ◽

Electromagnetic Interference ◽

Carbon Nanofiber ◽

Complex Impedance ◽

Shielding Effectiveness ◽

Emi Shielding ◽

Electromagnetic Interference Shielding ◽

Subsequent Decrease ◽

Electromagnetic Interference Shielding Effectiveness ◽

Vapor Grown Carbon Nanofiber

AbstractThe effect of processing variables (filler loadings) and operating variables (frequency) on the impedance and electromagnetic interference shielding effectiveness of vapor grown carbon nanofiber (VGCNF) reinforced chlorobutyl vulcanizates has been investigated. The dispersion and morphology of the VGCNF in the polymer matrix has been studied by scanning electron microscopy and Raman spectra. Addtionally, the utility of EPMA (Electron probe microanalyzer) as a tool to study the dispersion of nano fibers in polymer matrix has been explored for the first time. With increase in frequency and VGCNF loadings the composites showed a decrease in real part of complex impedance for increasing VGCNF loadings whereas the imaginary part showed a slight peak in the range of 9-10 GHz followed by a subsequent decrease. The measured impedance values were plotted as Nyquist plots (Argand diagrams) and a Resistor-Capacitance model was assumed. The EMI shielding effectiveness increased monotonically with filler loading and showed a maximum of around 55 dB at 12 phr loadings, thus making them suitable for EMI shielding applications.

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