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首页> 外文期刊>RSC Advances >Distinct plasmon resonance enhanced microwave absorption of strawberry-like Co/C/Fe/C core-shell hierarchical flowers via engineering the diameter and interparticle spacing of Fe/C nanoparticles
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Distinct plasmon resonance enhanced microwave absorption of strawberry-like Co/C/Fe/C core-shell hierarchical flowers via engineering the diameter and interparticle spacing of Fe/C nanoparticles

机译：不同的等离子体共振通过工程通过工程增强了草莓样CO / C / C核心壳分层花的微波吸收的微波吸收的Fe / C纳米粒子的直径和颗粒间距

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摘要

Strawberry-like Co/C/Fe/C core-shell hierarchical flowers (CSHFs) consisting of separated Fe/C nanoparticles (NPs) anchoring on a Co HF surface were prepared by decomposing Fe(CO)(5) in the presence of Co HFs. Changing the decomposition temperature (T-d) and Fe(CO)(5) volume (delta) could also facilely modulate the phase structure, surface morphology and composition of the products. The low T-d and small delta helped form Co/C/Fe/C CSHFs with a strawberry-like plasmon surface. The diameter and interparticle spacing-dependent electromagnetic properties were investigated at 2-18 GHz. The interparticle-spacing-to-diameter ratio determines the plasmon resonance and coupling. The permittivity and permeability enhanced by strong plasmon resonance were exhibited by Co/C/Fe/C CSHFs formed at delta = 3-4 mL with the interparticle-spacing-to-diameter ratio of 1.36-0.76. The collective oscillation of the conduction band electrons and near field on the Co/C and Fe/C surfaces generated a surface plasmon resonance and coupling, which were responsible for significantly enhanced permittivity and permeability with negative values. In view of the synergistic effect of the enhanced permittivity and permeability, dual dielectric relaxations, dual magnetic resonances, high attenuation and good impedance matching, Co/C/Fe/C CSHFs with particle size of 110 +/- 20-380 +/- 100 nm and interparticle spacing of 150 +/- 50 nm were excellent absorbers that feature strong absorption, broad bandwidth and light weight. An optimal reflection loss (R-L) of -45.06 was found at 17.92 GHz for an absorber thickness of 1.6 mm, and the frequency range (R-L <= -20 dB, 99% absorption) was over 2-18 GHz. Our findings demonstrated that optimally designed plasmonic heterostructures must be fabricated to improve microwave absorption performances for future applications.
机译：由CO HF表面上的分离的Fe / C纳米粒子（NPS）组成的草莓样CO / C / C核壳壳（CSHF）通过在CO的存在下进行分解Fe（CO）（5）来制备CO HF表面上的锚定。 HFS。改变分解温度（T-D）和Fe（CO）（5）体积（DELTA）也可以易于调节产品的相结构，表面形态和组成。低T-D和小δ通过草莓样等离子体表面帮助形成CO / C / Fe / C CSHF。在2-18GHz下研究了直径和颗粒间距依赖性电磁特性。晶间 - 间隔到直径比决定了等离子体共振和耦合。通过在δ= 3-4ml中形成的CO / C / Fe / C CSHF而展示强等离子体共振增强的介电常数和渗透性，其颗粒间距为1.36-0.76。 CO / C和Fe / C表面上的导通带电子和近场的集体振动产生了表面等离子体共振和耦合，其负责具有显着增强的介收和具有负值的渗透率。鉴于增强介电常数和渗透性，双介电弛豫，双磁共振，高衰减和良好阻抗匹配，CO / C / FE / C粒径为110 +/- 20-380 +/- 150 +/- 50nm的100nm和颗粒间距是优异的吸收剂，具有强吸收，宽带宽和重量轻。在17.92GHz的吸收器厚度为1.6mm的17.92GHz，频率范围（R-L <= -20dB，吸收）超过2-18GHz，最佳反射损失（R-1）。我们的研究结果表明，必须制造最佳设计的等位素异质结构以改善未来应用的微波吸收性能。

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  • 来源
    《RSC Advances》 |2019年第39期|共12页
  • 作者

    He Zidong; Liu Minmin; Liu Lin; Tong Guoxiu; Wu Wenhua; Wang Xiaojuan;

  • 作者单位

    Zhejiang Normal Univ Coll Chem &

    Life Sci Key Lab Minist Educ Adv Catalysis Mat Jinhua 321004 Zhejiang Peoples R China;

    Zhejiang Normal Univ Coll Chem &

    Life Sci Key Lab Minist Educ Adv Catalysis Mat Jinhua 321004 Zhejiang Peoples R China;

    Zhejiang Normal Univ Coll Chem &

    Life Sci Key Lab Minist Educ Adv Catalysis Mat Jinhua 321004 Zhejiang Peoples R China;

    Zhejiang Normal Univ Coll Chem &

    Life Sci Key Lab Minist Educ Adv Catalysis Mat Jinhua 321004 Zhejiang Peoples R China;

    Zhejiang Normal Univ Coll Chem &

    Life Sci Key Lab Minist Educ Adv Catalysis Mat Jinhua 321004 Zhejiang Peoples R China;

    Zhejiang Normal Univ Coll Chem &

    Life Sci Key Lab Minist Educ Adv Catalysis Mat Jinhua 321004 Zhejiang Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
  • 关键词

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