石墨烯
材料科学
纳米复合材料
氧化物
扫描电子显微镜
透射电子显微镜
电磁屏蔽
电介质
纳米颗粒
磁性纳米粒子
拉曼光谱
介电损耗
微波食品加热
纳米技术
复合材料
光电子学
光学
量子力学
物理
冶金
作者
Jagdees Prasad,Ashwani Kumar Singh,Krishna Kamal Haldar,Monika Tomar,Vinay Gupta,Kedar Singh
出处
期刊:RSC Advances
[The Royal Society of Chemistry]
日期:2019-01-01
卷期号:9 (38): 21881-21892
被引量:37
摘要
Magnetic CoFe2O4 nanoparticles decorated onto the surface of a MoS2-reduced graphene oxide (MoS2-rGO/CoFe2O4) nanocomposite were synthesized by a simple two-step hydrothermal method. The electromagnetic (EM) wave absorption performance and electromagnetic interference (EMI) shielding effectiveness of the materials were examined in the frequency range of 8.0-12.0 GHz (X-band). The MoS2-rGO/CoFe2O4 nanocomposite was characterized by various tools such as X-ray diffraction, Raman spectroscopy, scanning electron microscopy, and transmission electron microscopy. High-resolution transmission electron microscopy results confirmed the decoration of magnetic nanoparticles onto the surface of the MoS2-rGO nanocomposite with a diameter of 8-12 nm. The multiple interfacial polarization, moderate impedance matching, and defect dipole polarization improve the dielectric and magnetic loss of the materials, which leads to strong attenuation loss ability of incident EM energy within the shield. The pure MoS2-rGO nanocomposite represents total shielding effectiveness (SET ∼16.52 dB), while the MoS2-rGO/CoFe2O4 nanocomposite exhibits total shielding effectiveness (SET ∼19.26 dB) over the entire frequency range. It may be explained that the magnetic nanoparticles (CoFe2O4) serve as excellent conductive and magnetic fillers with a large surface area, leading to the migration of charge carriers at multi-interfaces.
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