Which mechanism causes quenching of fluorescence in a fluorescent dye molecule when near a metal nanoparticle?

💡 Explanation

When a fluorophore is near a metal nanoparticle, surface plasmon coupling occurs because the dye's excited state energy non-radiatively transfers to the plasmons, increasing radiative decay rates. Therefore, surface plasmon coupling results, rather than FRET or PET which require spectral overlap or redox activity and intersystem crossing which is heavy ion induced decay.

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