It is said that substances such as malachite green (MG) and crystal violet (CV), which are used as Ramandye, are combined with Gold nanoparticle (AuNP) to measure Raman (SERS). I'm curious about the principle of how malachite green(MG) and crystal violet(CV) combine to Gold nanoparticle(AuNP). Thank you!
하영 Cho
You probably know that the color of dyes is due to the interaction of its electrons with quanta of the visible part of the electromagnetic spectrum. Dyes are adsorbed on gold nanoparticles and interact with plasmons of gold and silver nanoparticles. This property leads to increased intensity of absorption bands and is called SERS.
Dear Cho !!!
- The principle of combining malachite green (MG) and crystal violet (CV) with gold nanoparticles (AuNPs) for Raman measurement is based on the surface-enhanced Raman scattering (SERS) effect.
- SERS is a technique that enhances the Raman scattering signal from molecules adsorbed or in close proximity to noble metal nanoparticles, such as gold or silver.
- The process involves the following principles:
If the meaning of your question is to ask just the adsorption or interaction between the particle surface and the molecule, then both molecules bind to the particle surface by electrostatic interaction. Of course, if your gold nanoparticles are stabilized by citrate. There are no seaking groups for chemisorption in either molecule, such as thiol, but there are terminus groups that are positively charged.
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