Plasmonic and photo-electrochemical enhancements of the AuAg@Au/RGO-C 3 N 4 nanocomposite for the detection of DA.

Plasmonic photocatalyst has attracted significant attention due to its valuable theoretical study and promising practical applications in solar cells, functional composites, and sensors. Herein, an interesting RGO-C3 N4 -supported AuAg core-Au shell (AuAg@Au) nanocomposite has been reported. Due to the surface plasmon resonance (SPR) of AuAg@Au and the accelarated electron transfer and separation of charge carriers induced by the fascinating RGO-C3 N4 substrate, the newly-generated AuAg@Au/RGO-C3 N4 nanomaterials show a strong photo-electrochemical response under visible-light irradiation. The AuAg@Au/RGO-C3 N4 photocatalyst demonstrated an excellent photo-electrochemical performance with a broad concentration linear range of 0.064-780.904 μM and a low detection limit of 0.022 μM, high stability, and good selectivity when applied in the determination of dopamine (DA) under visible-light irradiation.