Electrochemical Modulation of Fluorophore Emission on a Nanostructured Gold Film

Suppressing the charge-transfer quenching with an externally applied electrochemical bias results in a fluorescence enhancement of a fluorophore (pyrene) on a gold nanoparticle surface (see scheme). At positive bias the fluorophore is totally quenched on the gold surface while at negative bias (less than −0.5 V) it becomes highly fluorescent.