Disentangling SERS signals from two molecular species: A new evidence for the production of p,p′-dimercaptoazobenzene by catalytic coupling reaction of p-aminothiophenol on metallic nanostructures

► Non-identical temporal behavior of p-ATP and DMAB as revealed by auto-correlation analysis. ► Non-identical spatial distribution of p-ATP and DMAB as revealed by SERS imaging. ► Plasmon-assisted catalysis processes can be operational on metallic nanostructures.