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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Modulation of the composition and surface morphology of expanded graphite/Fe/Fe3O4 composites for plasmon resonance-enhanced microwave absorption
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Modulation of the composition and surface morphology of expanded graphite/Fe/Fe3O4 composites for plasmon resonance-enhanced microwave absorption

机译：膨胀石墨/ Fe / Fe3O4复合材料的组成和表面形态的调节，用于等离子体共振增强微波吸收

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Expanded graphite (EG)/Fe/Fe3O4 composites were prepared through chemical vapor deposition. The composition and surface morphology of the composites were controlled by changing Fe(CO)(5)vol (delta). With increasing delta from 1 mL to 4 mL, the contents of Fe and Fe3O4 increased from 0 to 6.64% and 81.84%, respectively. Fe/Fe3O4 nanoparticles anchored on the EG surface formed a strawberry-like structure at delta = 1-3 mL and a compact particle film at delta = 4 mL. In this case, the M-s values gradually increased with increasing Fe3O4 and Fe contents. The H-c values gradually decreased due to the synergistic effect of the coupling and spatial confinement effect, shape anisotropy, and crystal size. EG/Fe/Fe3O4 composites with strawberry-like surface (S1-S3) exhibited higher permeability, permittivity, and microwave absorption properties than pure EG and composites with compact particle film. Composites with strawberry-like surface (S3) displayed optimal microwave absorption property, with a minimum R-L value of -41.6 dB at 7.84 GHz and frequency range (R-L = -20 dB, 99% absorption) of 15.7 GHz. The excellent properties could be attributed to the enhanced permittivity, permeability, and multiple resonances caused by the localized surface plasmon resonance (LSPR). This work provides a significant guide for design and synthesis of microwave absorbers with broad bandwidth and light weight. (C) 2018 Elsevier B.V. All rights reserved.
机译：通过化学气相沉积制备膨胀石墨（例如）/ Fe / Fe3O4复合材料。复合材料的组成和表面形态通过改变Fe（CO）（5）Vol（Delta）来控制。随着1ml至4mL的增加，Fe和Fe3O4的含量分别从0增加到6.64％和81.84％。在例如表面上锚定的Fe / Fe3O4纳米颗粒在Δ= 1-3ml处形成草莓样结构，并且在Delta = 4ml处具有紧凑的颗粒膜。在这种情况下，M-S值随着Fe3O4和Fe内容的增加而逐渐增加。由于耦合和空间限制效果，形状各向异性和晶体尺寸的协同效应，H-C值逐渐降低。 EG / Fe / Fe3O4复合材料与草莓样表面（S1-S3）表现出比纯粹的渗透性，介电常数和微波吸收性能更高，例如具有紧凑颗粒膜的复合材料。具有草莓样表面的复合材料（S3）显示出最佳的微波吸收性能，最小R-L值为-41.6 dB，7.84GHz和频率范围（R-1 = -20 dB，99％吸收）为15.7GHz。优异的性能可归因于由局部表面等离子体共振（LSPR）引起的增强介电常数，渗透率和多个共振。这项工作为具有宽带宽和重量轻的微波吸收器的设计和合成提供了重要指导。 （c）2018年elestvier b.v.保留所有权利。

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