Refractive Index Susceptibility of the Plasmonic Palladium Nanoparticle: Potential as the Third Plasmonic Sensing Material

Citations Over TimeTop 10% of 2015 papers

Abstract

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.

Related Papers

• → Refractive Index of Liquid D₂O for Visible Wavelengths(2011)33 cited
• → Development of a Two-Dimensional Evaluation Method for Thin Layers Using Surface Plasmon Resonance(2001)7 cited
• Sweet plasmonics： Sucrose macrocrystals of metal nanoparticles(2015)
• → The Refractive Index Sensing Performance of Au and Ag Nanoparticles Under Different Surrounding Environment(2023)2 cited
• → Method for simultaneous measuring diffusion coefficients and refractive index dependence on concentration at different wavelengths(1980)2 cited