Journal
ACS NANO
Volume 9, Issue 2, Pages 1895-1904Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn506800a
Keywords
localized surface plasmon; palladium nanoparticles; refractive index susceptibility; core-shell nanoparticles; ultraviolet region
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Funding
- JSPS KAKENHI [26810102]
- Grants-in-Aid for Scientific Research [26810102, 26810052] Funding Source: KAKEN
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We demonstrate that Pd nanospheres exhibit much higher susceptibility of the localized surface plasmon resonance (LSPR) peak to medium refractive index changes than commonly used plasmonic sensing materials such as Au and Ag. The susceptibility of spherical Au nanoparticle-core/Pd-shell nanospheres (Au/PdNSs, ca. 73 nm in diameter) was found to be 4.9 and 2.5 times higher, respectively, than those of Au (AuNSs) and Ag nanospheres (AgNSs) having similar diameters. The experimental finding was theoretically substantiated using the Mie exact solution. We also showed from a quasi-static (QS) approximation framework that the high susceptibility of Pd LSPR originates from the smaller dispersion of the real part of its dielectric function than those of Au and Ag LSPR around the resonant wavelength. We conclude that the Pd nanoparticle is a promising candidate of the third plasmonic sensing material following Au and Ag to be used in ultrahigh-sensitive LSPR sensors.
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