Effect of Ions and Ionic Strength on Surface Plasmon Extinction Properties of Single Plasmonic Nanostructures
Nanoscale temperature change and single particle absorption, scattering and emission measurements revealed presence of small concentration of ions in surrounding water. The presence of these ions attenuates the plasmon absorption and scattering properties of a nanostructure. This attenuation effect is found dependent upon the ionic strength of the solution and the attenuation is related to the amount of coverage of screen charge at the surface. In this chapter, we present the effects of changes on surrounding medium (solution) properties (by addition of small amount of ionic solute molecules) on fundamental light absorption and scattering properties of a plasmonic gold nanostructure(s). This chapter is reprinted (adapted) with permission from ACS Nano 2016, 10 (6), 6080–6089. Copyright 2016 American Chemical Society.