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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-壳纳米粒子的双指数折射率敏感性：双等离子体激元共振和红移的影响

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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：为了提高局部表面等离振子共振（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，可以通过大大增加金属-半导体核-壳的等离激元波长红移来改善其折射率灵敏度。纳米粒子（CSN）。使用扩展的Mie理论和Au @ Cu 2？ x S CSN，我们从理论上研究了整个附近金属-金属CSN的光学特性-红外波段。与相同条件下的金属-金属CSN和金属-金属CSN相比，金属-半导体CSN具有更高的双指数灵敏度曲线，因为它们的核和壳分别支持两个LSPR，从而极大地增加了LSPR在整个近距离处的红移。红外范围。值得注意的是，可以通过增加壳厚与芯半径之比来有效地提高灵敏度，而不是在电介质-金属CSN的情况下降低灵敏度。灵敏度提高的根本原因是斥力随着壳厚度的增加而增加，这与电介质-金属CSN不同。这种设计方法不仅为在生物学和化学领域中利用金属半导体CSN铺平了道路，而且为高灵敏度传感器的设计提出了新思路。

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