Abstract
A novel hybrid of reduced graphene oxide-silver nanoparticle composite (rGO-Ag) wrapped by a thin layer of polydopamine (PDA) (rGO-Ag@PDA) was prepared as a highly active substrate for surface enhanced Raman scattering detection of aromatic dyes. rGO-Ag prepared by one-pot citrate reduction was coated with PDA through the self-polymerization of dopamine to produce the rGO-Ag@PDA hybrid. The morphology, component, absorption ability and SERS activity of the products were characterized by SEM, EDS, FTIR, UV–vis absorption, and Raman spectroscopy. Due to the PDA coating, the rGO-Ag@PDA hybrid shows enhanced adsorption ability to the dye molecules, and subsequently leads to stronger SERS signal of dyes than that obtained on widely reported rGO-Ag hybrid substrate. SERS detection of crystal violet, methylene blue, and malachite green on the rGO-Ag@PDA can be down to 0.1nM, 0.1μM and 1nM, respectively. Moreover, the rGO-Ag@PDA also displayed enhanced stability and improved recyclability than those of rGO-Ag. The proposed substrate may be used for SERS analysis and environmental monitoring.
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