Constructing flake-like ternary rare earth Pr3Si2C2 ceramic on SiC whiskers to enhance electromagnetic wave absorption properties

Zhu, Henghai; Qin, Gang; Zhou, Wei; Li, Yang; Zhou, Xiaobing

doi:10.1016/j.ceramint.2023.10.050

Cited by 51 publications

(4 citation statements)

References 55 publications

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“…Finally, the large specific surface area of silver nanoparticles generated charge accumulation at the interface of AgNWs, inducing interfacial polarization and enhancing the absorption loss of electromagnetic wave. 51,52 In conclusion, multiple shielding mechanisms, such as multiple reflections, conductivity loss, and interfacial polarization, worked in concert to achieve the outstanding electromagnetic shielding performance of IAgNWs −5 /PU foam.…”

Section: Electromagnetic Shielding Performance Of Agnws/pu Composite ...mentioning

confidence: 93%

Preparation of Ultralong AgNWs/PU Composite Foam for Outstanding Electromagnetic Interference Shielding, Joule Heating, and Human Motion Detection

Zeng,

Zhu,

Jiang

et al. 2024

ACS Appl. Nano Mater.

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With the booming development of communication technology and electronic devices, increasingly complex real-world scenarios propose higher demands on electromagnetic interference (EMI) shielding materials. Wearable EMI shielding materials with Joule heating capability and human motion detection can effectively promote benign functioning of the human body and protect sensitive electronic devices in cold and harsh environments. In this paper, silver nanowires (AgNWs)/polyurethane (PU) composite foams with multicellular structures were prepared by a simple dip-drying method. Benefiting from the high conductivity (10,417 S m–1) of the ultralong AgNW network and the interfacial polarization between the silver nanoparticles and the AgNWs, the composite foams have a high EMI shielding performance dominated by microwave absorption. The EMI shielding effectiveness (SE) and specific EMI shielding effectiveness (SSE/t) of the composite foam in the X-band (8.2–12.4 GHz) reached 94.96 dB and 9,169.8 dB cm2 g–1, respectively. The electromagnetic shielding effectiveness is up to 99.99999997%. Meanwhile, at an external voltage of 0.75 V, the surface saturation temperature of the IAgNWs–5/PU composite foam rapidly increased from room temperature to 125.6 °C and remained steady. Furthermore, the IAgNWs–5/PU composite foam can be used as a multifunctional sensing device for monitoring human motion signals based on the good resilience of the PU foam and the stability of the AgNW conductive network. These superior properties make the AgNWs/PU composite foam have great potential applications in military equipment, aerospace, and wearable electronic devices.

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Section: Electromagnetic Shielding Performance Of Agnws/pu Composite ...mentioning

confidence: 93%

Preparation of Ultralong AgNWs/PU Composite Foam for Outstanding Electromagnetic Interference Shielding, Joule Heating, and Human Motion Detection

Zeng,

Zhu,

Jiang

et al. 2024

ACS Appl. Nano Mater.

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“…The energy that is not reflected from the surface and enters the shield is weakened by the shielding materials when it propagates through the shield, which is called absorption. When the residual energy that has not decayed in the shield is transferred to another material surface, it forms a second reflection when encountering a discontinuous metal-air impedance interface, and returns to the shield to form multiple reflections. , In short, the electromagnetic attenuation of EMI shielding is mainly on the basis of the absorption and reflection of EMWs.…”

Section: Electromagnetic Shieldingmentioning

confidence: 99%

Electrospun Composite Nanofiber Membranes for Electromagnetic Protection

Yan,

2024

ACS Appl. Nano Mater.

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With the rapid development of electronic information technology, the impact of electromagnetic waves (EMWs) on human health, information security, and precision electronic equipment cannot be ignored. Therefore, how to prepare lightweight, flexible and multifunctional materials to shield EMWs is an urgent problem to be solved. Electrospun nanofiber membranes (NFMs) have many merits, such as being lightweight and porous and having a high specific surface area, for electromagnetic interference (EMI) shielding. In this review, the mechanism of EMI shielding as well as the principle and development of electrospinning are first introduced. Then, the commonly used materials in electrospun NFMs for EMI shielding are summarized, and the factors affecting their EMI shielding performance are discussed. Afterward, the modification methods to enhance the EMI shielding performance of NFMs are investigated. Finally, the enhancement effects of different structures of NFMs on their EMI shielding performance are analyzed. This review can provide a more comprehensive understanding of electrospun NFMs used for EMI shielding and play a guiding role in preparing electrospun NFMs with excellent EMI shielding performance in the future.

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“…Many studies have indicated that long-time exposure to electromagnetic waves may adversely affect human health. Therefore, investigations of electromagnetic interference (EMI) shielding materials have emerged as a prominent area of research in recent years [ 1 , 2 , 3 , 4 , 5 , 6 ].…”

Section: Introductionmentioning

confidence: 99%

A Sandwich Structural Filter Paper–AgNWs/MXene Composite for Superior Electromagnetic Interference Shielding

Han,

Feng,

Tian

et al. 2024

Polymers

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A thin, lightweight and flexible electromagnetic interference (EMI) shielding paper composite is an urgent need for modern military confrontations. Herein, a sandwich-structured EMI shielding paper composite with an easy pavement consisting of a filter paper layer, middle AgNWs/MXene layer, and polyvinyl butyral (PVB) layer was constructed by vacuum-assisted filtration, spraying and air-drying. The middle AgNWs/MXene compound endowed the filter paper with excellent electrical conductivity (166 S cm−1) and the fabricated filter paper–AgNWs/MXene–PVB composite exhibits superior EMI shielding (30 dB) with a 141 μm thickness. Remarkably, the specific EMI shielding effectiveness (SSE/t) of the filter paper–AgNWs/MXene–PVB composite reached 13,000 dB cm2 g−1 within the X-band frequency range. This value represents one of the highest reported for cellulose-based EMI shielding materials. Therefore, our sandwich-structured filter paper composite with superior EMI shielding performance can be used in the medical and military fields.

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Constructing flake-like ternary rare earth Pr3Si2C2 ceramic on SiC whiskers to enhance electromagnetic wave absorption properties

Cited by 51 publications

References 55 publications

Preparation of Ultralong AgNWs/PU Composite Foam for Outstanding Electromagnetic Interference Shielding, Joule Heating, and Human Motion Detection

Preparation of Ultralong AgNWs/PU Composite Foam for Outstanding Electromagnetic Interference Shielding, Joule Heating, and Human Motion Detection

Electrospun Composite Nanofiber Membranes for Electromagnetic Protection

A Sandwich Structural Filter Paper–AgNWs/MXene Composite for Superior Electromagnetic Interference Shielding

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