When dyes are added to an aqueous suspension of nanoparticles, they can perform the following functions

1. adsorb on the surface of nanoparticles and change their spectrum in the visible region

2. act as water pollutants in dye factory wastewater when studying the catalytic properties of nanoparticles.

3. act as a standard of substances in SERS analysis.

4. When mixing dyes and nanoparticles with plasmonic absorption, two types of absorption in the visible part of the spectrum and their interaction can be studied.

When mixing dyes and nanoparticles with plasmonic absorption, two types of absorption in the visible part of the spectrum and their interaction can be studied.