Dielectric, Electromagnetic Interference Shielding and Absorption Properties of Si3N4–PyC Composite Ceramics

Hao, Xuan; Yin, Xiaowei; Zhang, Litong; Cheng, Laifei

doi:10.1016/j.jmst.2013.01.011

Cited by 50 publications

(21 citation statements)

References 25 publications

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“…But, in particular, the presence of AgPs and nanowires bridging effects in IPAg1.5 enhanced the network density, thereby increasing the conductivity and EMI shielding properties. The SE A value was very high as compared to that of the SE R value, implying that absorption is the dominant EMI shielding mechanism [51].…”

Section: Emi Shielding Effectiveness Of Carbon Foammentioning

confidence: 92%

Carbon foam decorated with silver particles and in situ grown nanowires for effective electromagnetic interference shielding

Farhan

Wang

2016

J Mater Sci

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Carbon foam filled with silver particles was fabricated by a powder molding process using polyurethane as pore former, novolac resin as binder, coal-tar pitch as densification additive, and silver foils as a filler. High-temperature treatment at 1200°C, transformed the silver into spherical particles covered with in situ grown Ag nanowires. Their microstructure, electromagnetic interference (EMI) shielding effectiveness (SE), and shielding mechanism was investigated. It was found that the micron-sized silver foils converted into particles during heat treatment and strongly bonded in carbon matrix. The addition of silver significantly enhanced both conductivity and SE. Carbon foam containing 1.5 wt% silver exhibited very impressive total SE and dielectric loss tangent owing to the more conductive network of silver particles providing fast electron-transport channels. A maximum specific EMI SE value of 58.21 dB g -1 cm 3 at 12 GHz was achieved in the carbon foam at 1.5 wt% Ag loading. The dominant mechanism was absorption with only 6-10 % reflectance, resulting from the multiple reflections at interfaces inside the foam. Due to controlled attachment of silver particles and in situ reactions, this novel substrate has unique opportunities for future surface tailoring required in various commercial and aerospace fields.

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Section: Emi Shielding Effectiveness Of Carbon Foammentioning

confidence: 92%

Carbon foam decorated with silver particles and in situ grown nanowires for effective electromagnetic interference shielding

Farhan

Wang

2016

J Mater Sci

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“…The reflection loss is defined as RL = 10 log P R /P I (dB), where P I and P R are the incident power and reflected power of microwave, respectively [24]. For example, when the RL is À10 dB, 90% of the microwave is absorbed and 10% of the microwave is reflected.…”

Section: Microwave Absorption Propertymentioning

confidence: 99%

Dielectric and microwave absorption properties of Ti3SiC2/cordierite composite ceramics oxidized at high temperature

Liu

Luo

et al. 2015

Journal of Alloys and Compounds

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“…4, EMI SE includes the shielding effectiveness due to reflection (SE R ), shielding effectiveness due to absorption (SE A ), and shielding effectiveness due to multiple reflection (SE M ), which can be calculated through the following equations [27,28] :…”

Section: Emi Ability Of Mwcnt/camentioning

confidence: 99%

Cellulose aerogels decorated with multi-walled carbon nanotubes: preparation, characterization, and application for electromagnetic interference shielding

Li¹,

Wan²

2015

Front. Agr. Sci. Eng.

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Electromagnetic wave pollution has attracted extensive attention because of its ability to affect the operation of electronic machinery and endanger human health. In this work, the environmentally-friendly hybrid aerogels consisting of cellulose and multi-walled carbon nanotubes (MWCNTs) were fabricated. The aerogels have a low bulk density of 58.17 mg$cm . The incorporation of MWCNTs leads to an improvement in the thermal stability. In addition, the aerogels show a high electromagnetic interference (EMI) SE total value of 19.4 dB. Meanwhile, the absorption-dominant shielding mechanism helps a lot to reduce secondary radiation, which is beneficial to develop novel eco-friendly EMI shielding materials.

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Dielectric, Electromagnetic Interference Shielding and Absorption Properties of Si3N4–PyC Composite Ceramics

Cited by 50 publications

References 25 publications

Carbon foam decorated with silver particles and in situ grown nanowires for effective electromagnetic interference shielding

Carbon foam decorated with silver particles and in situ grown nanowires for effective electromagnetic interference shielding

Dielectric and microwave absorption properties of Ti3SiC2/cordierite composite ceramics oxidized at high temperature

Cellulose aerogels decorated with multi-walled carbon nanotubes: preparation, characterization, and application for electromagnetic interference shielding

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