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Quantitative investigation on the critical thickness of the dielectric shell for metallic nanoparticles determined by the plasmon decay length

机译：通过等离子体衰减长度确定金属纳米粒子介电壳临界厚度的定量研究

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摘要

Inert dielectric shells coating the surface of metallic nanoparticles (NPs) are important for enhancing the NPs' stability, biocompatibility, and realizing targeting detection, but they impair NPs' sensing ability due to the electric fields damping. The dielectric shell not only determines the distance of the analyte from the NP surface, but also affects the field decay. From a practical point of view, it is extremely important to investigate the critical thickness of the shell, beyond which the NPs are no longer able to effectively detect the analytes. The plasmon decay length of the shell-coated NPs determines the critical thickness of the coating layer. Extracting from the exponential fitting results, we quantitatively demonstrate that the critical thickness of the shell exhibits a linear dependence on the NP volume and the dielectric constants of the shell and the surrounding medium, but only with a small variation influenced by the NP shape where the dipole resonance is dominated. We show the critical thickness increases with enlarging the NP sizes, or increasing the dielectric constant differences between the shell and surrounding medium. The findings are essential for applications of shell-coated NPs in plasmonic sensing.
机译：涂覆金属纳米颗粒（NPS）表面的惰性介电壳对于提高NPS的稳定性，生物相容性和实现靶向检测是重要的，但由于电场阻尼，它们损害了NPS的感测能力。介电壳不仅确定来自NP表面的分析物的距离，而且影响现场衰减。从实际的角度来看，研究壳体的临界厚度是非常重要的，超出了NPS不再能够有效地检测分析物。壳涂覆的NP的等离子体衰减长度决定了涂层的临界厚度。从指数拟合结果中提取，我们定量表现出壳体的临界厚度对壳体和周围介质的NP体积和介电常数具有线性依赖性，而是仅利用受NP形状影响的小变化偶极谐振占主导地位。我们显示临界厚度随着扩大NP尺寸而增加，或者增加壳体和周围介质之间的介电常数差异。该发现对于在等离子体感测中壳涂覆的NPS的应用是必不可少的。

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  • 来源
    《Nanotechnology》 |2018年第16期|共9页
  • 作者

    Li Anran; Lim Xinyi; Guo Lin; Li Shuzhou;

  • 作者单位

    Beihang Univ Sch Chem Minist Educ Key Lab Bioinspired Smart Interfacial Sci &

    Techn Beijing 100191 Peoples R China;

    Nanyang Technol Univ Ctr Programmable Mat Sch Mat Sci &

    Engn Singapore 639798 Singapore;

    Beihang Univ Sch Chem Minist Educ Key Lab Bioinspired Smart Interfacial Sci &

    Techn Beijing 100191 Peoples R China;

    Nanyang Technol Univ Ctr Programmable Mat Sch Mat Sci &

    Engn Singapore 639798 Singapore;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 特种结构材料;
  • 关键词

    shell-coated NP; critical thickness; plasmon decay length; plasmonic sensing;

    机译：壳涂层NP;临界厚度;等离子体衰减长度;等离子体传感;

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