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Double-exponential refractive index sensitivity of metal-semiconductor core-shell nanoparticles: the effects of dual-plasmon resonances and red-shift

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...

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Hauptverfasser: Zhang, Hailong (VerfasserIn) , Cao, Pengfei (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: 05 Jan 2018
In: RSC Advances
Year: 2018, Jahrgang: 8, Heft: 3, Pages: 1700-1705
ISSN:2046-2069
DOI:10.1039/C7RA11981J
Online-Zugang:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1039/C7RA11981J
Verlag, lizenzpflichtig, Volltext: https://pubs.rsc.org/en/content/articlelanding/2018/ra/c7ra11981j
Volltext
Verfasserangaben:Hailong Zhang, Pengfei Cao, Jie Dou, Lin Cheng, Tiaoming Niu and Guanmao Zhang

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520 |a 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 AuCu2−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. 
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