Shielding effectiveness evaluation using a non-standardized method

Voicu, Viorica; Pătru, Ion; Dina, Livia-Andreea; Nicolae, Petre-Marian; Smarandescu, Ionut Daniel

doi:10.1109/sielmen.2017.8123300

Cited by 6 publications

(3 citation statements)

References 7 publications

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“…In nanocomposites, the type of nanofiller, amount, and dispersion was found to be significant for superior shielding interference [77]. In this context, the electromagnetic shielding mechanism is investigated in the literature [78].…”

Section: Emi Shieldingmentioning

confidence: 99%

Graphene Nanocomposites for Electromagnetic Interference Shielding—Trends and Advancements

Kausar,

Ahmad,

Zhao

et al. 2023

J. Compos. Sci.

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Electromagnetic interference is considered a serious threat to electrical devices, the environment, and human beings. In this regard, various shielding materials have been developed and investigated. Graphene is a two-dimensional, one-atom-thick nanocarbon nanomaterial. It possesses several remarkable structural and physical features, including transparency, electron conductivity, heat stability, mechanical properties, etc. Consequently, it has been used as an effective reinforcement to enhance electrical conductivity, dielectric properties, permittivity, and electromagnetic interference shielding characteristics. This is an overview of the utilization and efficacy of state-of-the-art graphene-derived nanocomposites for radiation shielding. The polymeric matrices discussed here include conducting polymers, thermoplastic polymers, as well as thermosets, for which the physical and electromagnetic interference shielding characteristics depend upon polymer/graphene interactions and interface formation. Improved graphene dispersion has been observed due to electrostatic, van der Waals, π-π stacking, or covalent interactions in the matrix nanofiller. Accordingly, low percolation thresholds and excellent electrical conductivity have been achieved with nanocomposites, offering enhanced shielding performance. Graphene has been filled in matrices like polyaniline, polythiophene, poly(methyl methacrylate), polyethylene, epoxy, and other polymers for the formation of radiation shielding nanocomposites. This process has been shown to improve the electromagnetic radiation shielding effectiveness. The future of graphene-based nanocomposites in this field relies on the design and facile processing of novel nanocomposites, as well as overcoming the remaining challenges in this field.

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Section: Emi Shieldingmentioning

confidence: 99%

Graphene Nanocomposites for Electromagnetic Interference Shielding—Trends and Advancements

Kausar,

Ahmad,

Zhao

et al. 2023

J. Compos. Sci.

View full text Add to dashboard Cite

show abstract

“…In conducting polymer nanocomposites, electrical conductivity usually depends on nanofiller type, contents, and dispersion in the polymer matrix. For instance, including carbon nanotubes or nanofibers in conducting polymers enhanced the electromagnetic interference shielding interference (EMI SE) effects [23]. The mechanism of the electromagnetic shielding of conducting polymers and their derived nanocomposites has been explored in the literature [24].…”

Section: Emi Shieldingmentioning

confidence: 99%

Conducting Polymer Nanocomposites for Electromagnetic Interference Shielding—Radical Developments

Kausar

Ahmad

2023

J. Compos. Sci.

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Electromagnetic interference disturbs the working of electronic devices and affects the surroundings and human health. Consequently, research has led to the development of radiation-protection materials. Inherently conducting polymers have been found to be suitable for electromagnetic interference (EMI) shielding owing to their fine electrical conductivity properties. Moreover, nanoparticle-reinforced conjugated polymers have been used to form efficient nanocomposites for EMI shielding. Nanoparticle addition has further enhanced the radiation protection capability of conducting polymers. This state-of-the-art comprehensive review describes the potential of conducting polymer nanocomposites for EMI shielding. Conducting polymers, such as polyaniline, polypyrrole, and polythiophene, have been widely used to form nanocomposites with carbon, metal, and inorganic nanoparticles. The EMI shielding effectiveness of conducting polymers and nanocomposites has been the focus of researchers. Moreover, the microscopic, mechanical, thermal, magnetic, electrical, dielectric, and permittivity properties of nanocomposites have been explored. Electrically conducting materials achieve high EMI shielding by absorbing and/or dissipating the electromagnetic field. The future of these nanomaterials relies on nanomaterial design, facile processing, and overcoming dispersion and processing challenges in this field.

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“…Besides these methods, free space method which is conducted in anechoic chamber is also working based on Schelkunoff theory as well [18][19][20]. Either transmitting or receiving antenna are placed inside the chamber, the remaining instrument such as network analyzer or signal generator are located outside the chamber to reduce the interference.…”

Section: Introductionmentioning

confidence: 99%

Shielding effectiveness measurement of cement-graphite block in between 3.8 GHz to 6 GHz

et al. 2020

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Due to proliferation of electronic devices, the electromagnetic field (EMF) exposure affect human health in long term. On the other hand the operation electronic devices will be affected if the radiation level is too high. To reduce the radiation exposure, shielding is always used. Instead of building a shielding enclosure inside a building, it is more practical to improve the shielding capability of the building itself. Hence, this project intend to investigate the shielding effectiveness (SE) of cement added with graphite. Eight cement-graphite specimens with different percentages (0%, 3%, 7%, 11%, 15%, 19%, 25% and 30%) are prepared. They have been casted into the waveguide mold with size of 4.75 cm x 1 cm x 2.22 cm and taken for measurement directly. The SE measurement setup involve a pair of waveguide with frequency range of 3.8 GHz to 6 GHz and vector network analyser (VNA). Throughout the study, it is found that the percentage of graphite powder will affect the SE of the specimens. The SE is independent on its curing duration. More than 11% of graphite is needed to improve the SE of cement block in between 3.8 GHz to 6 GHz. The highest SE of 33 dB is achieved when the sample contains 30% of graphite with thickness of 1cm.

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Shielding effectiveness evaluation using a non-standardized method

Cited by 6 publications

References 7 publications

Graphene Nanocomposites for Electromagnetic Interference Shielding—Trends and Advancements

Graphene Nanocomposites for Electromagnetic Interference Shielding—Trends and Advancements

Conducting Polymer Nanocomposites for Electromagnetic Interference Shielding—Radical Developments

Shielding effectiveness measurement of cement-graphite block in between 3.8 GHz to 6 GHz

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