Origin of Shifts in the Surface Plasmon Resonance Frequencies for Au and Ag Nanoparticles

TL;DR

This paper discusses the causes of shifts in surface plasmon resonance frequencies in gold and silver nanoparticles, attributing red shifts to electron spill-out and blue shifts to screening effects and quantum surface electron effects.

Contribution

It provides a detailed analysis of the physical mechanisms behind SPR frequency shifts in noble metal nanoparticles, combining classical and quantum perspectives.

Findings

Electron spill-out causes red shifts in SPR frequencies.

Screening effects in porous media lead to blue shifts.

Quantum surface electron effects also contribute to blue shifts.

Abstract

Origin of shifts in the surface plasmon resonance (SPR) frequency for noble metal (Au, Ag) nanoclusters are discussed in this book chapter. Spill out of electron from the Fermi surface is considered as the origin of red shift. On the other hand, both screening of electrons of the noble metal in porous media and quantum effect of screen surface electron are considered for the observed blue shift in the SPR peak position.