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首页> 外文期刊>RSC Advances >Double-exponential refractive index sensitivity of metal-semiconductor core-shell nanoparticles: the effects of dual-plasmon resonances and red-shift
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Double-exponential refractive index sensitivity of metal-semiconductor core-shell nanoparticles: the effects of dual-plasmon resonances and red-shift

机译：金属半导体核心壳纳米粒子双指数折射率敏感性：双层谐振和红转的影响

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摘要

In order to improve the refractive index sensitivity of a localized surface plasmon resonance (LSPR) sensor, we present a new type of LSPR sensor whose refractive index sensitivity can be improved by greatly increasing the plasmon wavelength red-shift of metal-semiconductor core-shell nanoparticles (CSNs). Using extended Mie theory and Au@Cu2-xS CSNs, we theoretically investigate the optical properties of metal-semiconductor CSNs in the entire near-infrared band. Compared with dielectric-metal and metal-metal CSNs under the same conditions, the metal-semiconductor CSNs have a higher double-exponential sensitivity curve because their core and shell respectively support two LSPRs that greatly increase the LSPR red-shift to the entire near-infrared range. It is worth noting that the sensitivity can be improved effectively by increasing the ratio of the shell-thickness to core-radius, instead of decreasing it in the case of the dielectric-metal CSNs. The underlying reason for the enhancement of sensitivity is the increase of repulsive force with the enlargement of shell thickness, which is different from the dielectric-metal CSNs. This design method not only paves the way for utilizing metal-semiconductor CSNs in biology and chemistry, but also proposes new ideas for the design of sensors with high sensitivity.
机译：为了提高局部等离子体谐振（LSPR）传感器的折射率灵敏度，我们提出了一种新型的LSPR传感器，通过大大增加金属半导体芯壳的等离子体波长红转，可以提高折射率灵敏度的新型LSPR传感器纳米粒子（CSN）。使用扩展MIE理论和AU @ CU2-XS CSN，理论上研究了整个近红外带中的金属半导体CSN的光学性质。与介质金属和金属金属CSN相比相同的条件，金属半导体CSN具有较高的双指数敏感曲线，因为它们的核心和外壳分别支持两个LSPRS，这大大增加了LSPR向整个近的转变红外线范围。值得注意的是，通过提高壳体厚度与核心半径的比率，可以有效地提高灵敏度，而不是在介质金属CSN的情况下减少它。增强灵敏度的潜在原因是随着壳体厚度的扩大而增加的排斥力增加，这与介质金属CSN不同。这种设计方法不仅铺平了利用Biology和化学中的金属半导体CSN的方式，而且还提出了具有高灵敏度的传感器的新思路。

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  • 来源
    《RSC Advances》 |2018年第3期|共6页
  • 作者

    Zhang Hailong; Cao Pengfei; Dou Jie; Cheng Lin; Niu Tiaoming; Zhang Guanmao;

  • 作者单位

    Lanzhou Univ Sch Informat Sci &

    Engn Lanzhou 730000 Gansu Peoples R China;

    Lanzhou Univ Sch Informat Sci &

    Engn Lanzhou 730000 Gansu Peoples R China;

    Lanzhou Univ Sch Informat Sci &

    Engn Lanzhou 730000 Gansu Peoples R China;

    Lanzhou Univ Sch Informat Sci &

    Engn Lanzhou 730000 Gansu Peoples R China;

    Lanzhou Univ Sch Informat Sci &

    Engn Lanzhou 730000 Gansu Peoples R China;

    Lanzhou Univ Sch Informat Sci &

    Engn Lanzhou 730000 Gansu Peoples R China;

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