Estimating EMI shielding effectiveness of graphene-polymer composites at elevated temperatures

2017 ◽  
Vol 4 (8) ◽  
pp. 085605 ◽  
Author(s):  
Rahim Jan ◽  
Abdul Saboor ◽  
Ahmad Nawaz Khan ◽  
Imtiaz Ahmad
Keyword(s):  
Polymer Composites ◽  
Elevated Temperatures ◽  
Shielding Effectiveness ◽  
Emi Shielding ◽  
Emi Shielding Effectiveness

Tunable EMI shielding effectiveness using new exotic carbon: Polymer composites

2016 ◽  
Vol 688 ◽  
pp. 399-403 ◽  
Author(s):  
Monika Mishra ◽  
Avanish Pratap Singh ◽  
Vinay Gupta ◽  
Amita Chandra ◽  
S.K. Dhawan
Keyword(s):  
Polymer Composites ◽  
Shielding Effectiveness ◽  
Emi Shielding ◽  
Emi Shielding Effectiveness

scholarly journals PS/PANI/MoS2 Hybrid Polymer Composites with High Dielectric Behavior and Electrical Conductivity for EMI Shielding Effectiveness

Materials ◽  
2019 ◽  
Vol 12 (17) ◽  
pp. 2690 ◽  
Author(s):  
Saboor ◽  
Khalid ◽  
Jan ◽  
Khan ◽  
Farooq ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Dielectric Constant ◽  
Polymer Composites ◽  
Dielectric Behavior ◽  
Hybrid Polymer ◽  
Shielding Effectiveness ◽  
Emi Shielding ◽  
Emi Shielding Effectiveness ◽  
Dielectric Constant And Loss ◽  
High Dielectric

Liquid exfoliated molybdenum disulfide (MoS2) nanosheets and polyaniline (PANI) nanoparticles are dispersed in polystyrene (PS) matrix to fabricate hybrid polymer composites with high dielectric and electromagnetic interference (EMI) shielding behavior. A phase-separated morphology is formed when PANI and MoS2 are incorporated into polystyrene (PS) matrix. An increasing concentration of MoS2 nanoparticles inside PS/PANI (5 wt %) polymer blend forms an interconnected network, resulting in high electrical conductivity and dielectric behavior, making them a suitable candidate for EMI shielding application. An increment in dielectric constant and loss, up to four and five orders of magnitude, respectively, is recorded at a maximum concentration of 1 wt % of MoS2 in PS/PANI-5 polymer blend at 100 Hz. The enhanced dielectric characteristics for PS/PANI/MoS2 composites are then theoretically evaluated for the estimation of EMI shielding effectiveness in the frequency range of 100 Hz to 5 MHz. The maximum dielectric constant and loss achieved for PS/PANI-5 wt %/MoS2-1 wt % are responsible for estimated shielding effectiveness of around 92 dB at 100 Hz. The increase in dielectric behavior and shielding effectiveness is probably due to the increased number of charged dipoles accumulated at the insulator–conductor interface.

scholarly journals Graphene-ferrites interaction for enhanced EMI shielding effectiveness of hybrid polymer composites

2020 ◽  
Vol 7 (1) ◽  
pp. 016304 ◽  
Author(s):  
Ibrar Ahmed ◽  
Rahim Jan ◽  
Ahmad Nawaz Khan ◽  
Iftikhar Hussain Gul ◽  
Ramsha Khan ◽  
...  
Keyword(s):  
Polymer Composites ◽  
Hybrid Polymer ◽  
Shielding Effectiveness ◽  
Emi Shielding ◽  
Emi Shielding Effectiveness

scholarly journals Setup for EMI Shielding Effectiveness Tests of Electrically Conductive Polymer Composites at Frequencies up to 3.0 GHz

IEEE Access ◽  
2017 ◽  
Vol 5 ◽  
pp. 16665-16675 ◽  
Author(s):  
Roserio Valente ◽  
Chris De Ruijter ◽  
Daniel Vlasveld ◽  
Sybrand Van Der Zwaag ◽  
Pim Groen
Keyword(s):  
Polymer Composites ◽  
Conductive Polymer ◽  
Shielding Effectiveness ◽  
Emi Shielding ◽  
Electrically Conductive ◽  
Emi Shielding Effectiveness ◽  
Conductive Polymer Composites

scholarly journals Effective EMI shielding behaviour of thin graphene/PMMA nanolaminates in the THz range

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Christos Pavlou ◽  
Maria Giovanna Pastore Carbone ◽  
Anastasios C. Manikas ◽  
George Trakakis ◽  
Can Koral ◽  
...  
Keyword(s):  
Polymer Composites ◽  
Electromagnetic Interference ◽  
State Of The Art ◽  
Metallic Materials ◽  
Shielding Effectiveness ◽  
Emi Shielding ◽  
Mechanical Reinforcement ◽  
Emi Shielding Effectiveness ◽  
Laminate Materials ◽  
Lift Off

AbstractThe use of graphene in a form of discontinuous flakes in polymer composites limits the full exploitation of the unique properties of graphene, thus requiring high filler loadings for achieving- for example- satisfactory electrical and mechanical properties. Herein centimetre-scale CVD graphene/polymer nanolaminates have been produced by using an iterative ‘lift-off/float-on’ process and have been found to outperform, for the same graphene content, state-of-the-art flake-based graphene polymer composites in terms of mechanical reinforcement and electrical properties. Most importantly these thin laminate materials show a high electromagnetic interference (EMI) shielding effectiveness, reaching 60 dB for a small thickness of 33 μm, and an absolute EMI shielding effectiveness close to 3·105 dB cm2 g−1 which is amongst the highest values for synthetic, non-metallic materials produced to date.

An Investigation of EMI Shielding Effectiveness of Organic Polyurethane Composite Reinforced with MWCNT-CuO-Bamboo Charcoal Nanoparticles

2021 ◽  
Author(s):  
Jeyanthi Subramanian ◽  
S. Vinoth Kumar ◽  
G. Venkatachalam ◽  
Manshu Gupta ◽  
Rohan Singh
Keyword(s):  
Bamboo Charcoal ◽  
Shielding Effectiveness ◽  
Emi Shielding ◽  
Emi Shielding Effectiveness ◽  
Polyurethane Composite

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.

Elaboration and Characterization of Cu Based Nanocomposites for Electromagnetic Interferences Shielding

2021 ◽  
Vol 412 ◽  
pp. 177-184
Author(s):  
Farid Kara ◽  
Fadhéla Otmane ◽  
Samir Bellal ◽  
Amira Djenet Guerfi ◽  
S. Triaa
Keyword(s):  
Epoxy Resin ◽  
Xrd Analysis ◽  
High Energy ◽  
Shielding Effectiveness ◽  
Emi Shielding ◽  
Emi Shielding Effectiveness ◽  
Cell Measurement ◽  
Wave Guides ◽  
Pure Cu ◽  
Thin Samples

An electromagnetic interferences (EMI) shielding is a material that attenuates radiated electromagnetic energy. Polymer nanocomposites is a class of materials that combine electrical, thermal, dielectric, magnetic and/ or mechanical properties, which are useful for the suppression of electromagnetic interferences. In this work, we looked over the effectiveness of the electromagnetic interferences shielding of polymer-based nanocomposites. These are thin samples of epoxy resin strengthened with nanostructured Cu powders. Nanostructured Cu powders were obtained by mechanical milling using the high-energy RETSCH PM400 ball mill (200 rpm). A powder sampling was conducted after 3h, 6h, 12h, 24h, 33h, 46h and 58h milling for characterization requirements. XRD analysis via the Williamson-Hall method shows that the mean crystallites size decreases from 151.6 nm (pure Cu phase) to 13.8 nm (58 h milling). Simultaneously, the lattice strain increases from 0.1% (pure Cu phase) to 0.59% (58 h milling). The elaboration of thin samples was performed by mixing a vol./3 fractions of nanostructured Cu powder, epoxy resin and hardener. Thin slabs of 1 mm thickness were moulded for use in a rectangular wave-guide. The EMI shielding experimental involved a two ports S parameters cell measurement made of R120 metallic wave-guides of rectangular section (19.05x9.525 mm2) and operational over the frequency band of 9.84 to 15 GHz associated to a network analyser. Obtained results show moderate EMI shielding effectiveness for the milled Cu-based slabs.

Analysis of EMI Shielding Effectiveness for plastic fiber composites in the 5G sub-6 GHz band

2021 ◽  
Author(s):  
P. A. Martinez ◽  
J. Victoria ◽  
J. Torres ◽  
A. Suarez ◽  
A. Alcarria ◽  
...  
Keyword(s):  
Fiber Composites ◽  
Shielding Effectiveness ◽  
Emi Shielding ◽  
Emi Shielding Effectiveness
Sign in / Sign up

Export Citation Format

Share Document