碳纳米管修饰的磁性/陶瓷纳米粒子的结构、电学及电磁干扰屏蔽性能

Structural, electrical and EMI shielding property of carbon nanotube decorated magnetic/ceramic nanoparticles.

作者信息

Dehghani-Dashtabi Mahdieh, Hekmatara Hoda

机构信息

Department of Physics, Faculty of Science, Vali-e-Asr University of Rafsanjan, Rafsanjan, Iran.

出版信息

Sci Rep. 2025 Jan 8;15(1):1311. doi: 10.1038/s41598-025-85378-4.

DOI:10.1038/s41598-025-85378-4

PMID:39779770

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11711323/

Abstract

To protect against harmful electromagnetic interference (EMI), it is crucial to fabricate composite with high total electromagnetic shielding efficiency (SE); In this study, FeNi-NiFeO-SiO nanoparticles (NPs) were synthesized using one-pot method and decorated on carbon nanotube's (CNT) sidewall. The final product was magnetic-ceramic/conductive (FeNi-NiFeO-SiO/MWCNT) nanocomposite. The EMI shielding characteristic of FeNi-NiFeO-SiO NPs and FeNi-NiFeO-SiO/MWCNT nanocomposite was investigated in the range of X and Ku frequency band. The results indicated the high total shielding effectiveness of the FeNi-NiFeO-SiO/MWCNT nanocomposite with a thickness of 3.5 mm which was 25dB (SE>20dB ~ 90%) at an entire frequency band. The EMI shielding effectiveness of nanocomposite was higher than that of nanoparticles, because of the multi wall carbon nanotube (MWCNT) improved the AC conductivity of nanoparticles. Overall, The FeNi-NiFeO-SiO/MWCNT nanocomposite is a promising shielding material which prevents from passing 95% of incident wave through itself.

摘要

为了防止有害电磁干扰（EMI），制造具有高总电磁屏蔽效率（SE）的复合材料至关重要；在本研究中，采用一锅法合成了FeNi-NiFeO-SiO纳米颗粒（NPs）并将其装饰在碳纳米管（CNT）的侧壁上。最终产物是磁性陶瓷/导电（FeNi-NiFeO-SiO/MWCNT）纳米复合材料。在X和Ku频段范围内研究了FeNi-NiFeO-SiO NPs和FeNi-NiFeO-SiO/MWCNT纳米复合材料的电磁干扰屏蔽特性。结果表明，厚度为3.5毫米的FeNi-NiFeO-SiO/MWCNT纳米复合材料在整个频段具有25dB（SE>20dB ~ 90%）的高总屏蔽效能。纳米复合材料的电磁干扰屏蔽效能高于纳米颗粒，这是因为多壁碳纳米管（MWCNT）提高了纳米颗粒的交流电导率。总体而言，FeNi-NiFeO-SiO/MWCNT纳米复合材料是一种很有前景的屏蔽材料，可防止95%的入射波穿透自身。