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柔性多孔聚偏氟乙烯-多壁碳纳米管泡沫在X波段频率范围内的微波吸收性能

Microwave Absorption Performance of Flexible Porous PVDF-MWCNT Foam in the X-Band Frequency Range.

作者信息

Khade Vaishnavi, Wuppulluri Madhuri

机构信息

Center for Functional Materials, Vellore Institute of Technology, Vellore, Tamil Nadu 632014, India.

School of Advanced Sciences, Vellore Institute of Technology, Vellore, Tamil Nadu 632014, India.

出版信息

ACS Omega. 2024 Aug 6;9(33):35364-35373. doi: 10.1021/acsomega.4c00995. eCollection 2024 Aug 20.

DOI:10.1021/acsomega.4c00995
PMID:39184473
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11339829/
Abstract

Lightweight electromagnetic absorbers made of polymers and multiwall carbon nanotubes (MWCNTs) have attracted a lot of attention because of their potential to shield next-generation electronics devices from electromagnetic radiation without reflecting it back into space. In this research, a flexible foam composed of MWCNTs and polyvinylidene fluoride (PVDF) is developed. This foam is designed to be an electromagnetic shielding material that is both flexible and absorption-dominant, reducing electromagnetic interference. The solvent approach is used to fabricate the PVDF-MWCNT foam. It is discovered that the foam has a porosity of 88.9%. Each cell in the PVDF-MWCNT foam is formed in a porous layered manner. The foam demonstrates a dielectric constant (ϵ ) of around 7.19 and dielectric loss (ϵ ) of 4.46 at 9.96 GHz as calculated from MATLAB using the Nicolson-Ross-Wire algorithm. This developed EM absorber exhibits a high shielding efficiency of 78.46 dB. With an ideal reflection loss of -26.5 dB, this absorber attains the desired outcomes. The electromagnetic shielding performance is supported by calculations of the impedance matching degree, which was found to be 0.54. The PVDF-MWCNT foam displayed absorption-dominant characteristics, with a significantly low shielding due to reflection. This newly developed foam EM absorber has proven itself capable in a variety of commercial and stealth-related applications.

摘要

由聚合物和多壁碳纳米管（MWCNT）制成的轻质电磁吸收体因其有潜力保护下一代电子设备免受电磁辐射且不会将其反射回太空而备受关注。在本研究中，开发了一种由MWCNT和聚偏二氟乙烯（PVDF）组成的柔性泡沫。这种泡沫被设计为一种兼具柔性和吸收主导特性的电磁屏蔽材料，可减少电磁干扰。采用溶剂法制备PVDF - MWCNT泡沫。发现该泡沫的孔隙率为88.9%。PVDF - MWCNT泡沫中的每个单元以多孔层状方式形成。使用MATLAB通过Nicolson - Ross - Wire算法计算得出，该泡沫在9.96 GHz时的介电常数（ϵ ）约为7.19，介电损耗（ϵ ）为4.46。这种开发的电磁吸收体具有78.46 dB的高屏蔽效率。该吸收体的理想反射损耗为 - 26.5 dB，达到了预期效果。通过计算阻抗匹配度为0.54，支持了电磁屏蔽性能。PVDF - MWCNT泡沫表现出吸收主导特性，反射引起的屏蔽显著较低。这种新开发的泡沫电磁吸收体已证明自身在各种商业和与隐身相关的应用中具有能力。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/45d1/11339829/ccd624812d9a/ao4c00995_0006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/45d1/11339829/948c43bc6f94/ao4c00995_0001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/45d1/11339829/b5544f100951/ao4c00995_0002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/45d1/11339829/0f196b2865af/ao4c00995_0003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/45d1/11339829/78a105f03e4d/ao4c00995_0004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/45d1/11339829/e0d4eef35a61/ao4c00995_0005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/45d1/11339829/ccd624812d9a/ao4c00995_0006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/45d1/11339829/948c43bc6f94/ao4c00995_0001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/45d1/11339829/b5544f100951/ao4c00995_0002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/45d1/11339829/0f196b2865af/ao4c00995_0003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/45d1/11339829/78a105f03e4d/ao4c00995_0004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/45d1/11339829/e0d4eef35a61/ao4c00995_0005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/45d1/11339829/ccd624812d9a/ao4c00995_0006.jpg

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High-Entropy Enhanced Microwave Attenuation in Titanate Perovskites.高熵增强的钛酸盐钙钛矿中的微波衰减。
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