Size and Shape Effects in Optical Spectra of Silver and Gold Nanoparticles

Kondorskiy, A. D.; Лебедев, В. С.

doi:10.1007/s10946-021-10012-3

Cited by 4 publications

(1 citation statement)

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“…Sufficiently correct consideration of internal-size effects for spherical nanoparticles of noble metals with sizes smaller than the free path of electrons in a massive metal sample can be performed using the Kreibig model [1,26]. This model has been successfully used to calculate the spectra Q ext , Q sca , Q abs for spherical Ag, Au, Cu nanoparticles surrounded by a non-absorbing medium [27][28][29]. Similar approach was also used for hybrid nanoparticles placed in a non-absorbing medium, which represented the two-layer nanospheres with a concentric metal core and an absorbing organic shell consisting of molecular aggregates of dyes (see [30] and references therein).…”

Section: Introductionmentioning

confidence: 99%

Influence of matrix absorbance on the near-field and spectral characteristics of plasmon spherical nanoparticles scattering

Дынич

Ponyavina

2022

Optics and Spectroscopy

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Regularities of a size dependence of extinction and absorption efficiency factors as well as of near-zone and far-zone scattering efficiency factors are studied in the spectral range of the surface plasmon resonance of absorption (SPRA) for silver spherical nanoparticles placed into absorbing matrixes with complex refraction index nm+ikappam. Numerical simulation was made with the use of the Mie theory for absorbing matrixes. Approximation of the electron mean free path limitation was used in order to take into account the intrinsic size effects into a metal nanoparticle which consist in a size dependence of its dielectric characteristics. We shown that a growth of matrix absorbency leads to a strong suppression of resonances of extinction Qext and near-zone scattering QNF efficiency factors without any essential changing of their spectral position. We established that for any fixed wavelength in the spectral range of the SPRA the values of Qext and QNF depend on metal nanoparticle sizes nonmonotonically at kappam=0-0.1. The RNP optimal value, which corresponds to the maximal values of efficiency factors for the given material of plasmonic nanoparticles, increases at the matrix absorbency growth. The intrinsic size effects contribution to the efficiency factors resonance suppression decreases at the enhancement of nanoparticle sizes and/or matrix absorption. As an example of a real absorbing matrix with a dispersion of relraction index we considered the nickel phtalocyanine matrix (NiPc), which is interesting from the point of view of photovoltaic applications. Keywords: Plasmonic naniparticles, absorbing matrixes, characteristics of near-zone and far-zone scattering.

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