Abstract
We successfully synthesized raspberry-like polydopamine/silver nanoparticles (PDA@AgNPs) composites utilizing PDA sphere as a template, a chelating agent and a binding/reducing agent. The surface enhanced Raman scattering (SERS) performance of PDA@AgNPs composites were optimized by tuning the mass of silver precursor and the reaction temperature. Acrylamide (AAm), a “potential carcinogen to human”, was employed as a model compound to validate the SERS effect of the fabricated substrate. Such PDA@AgNPs based SERS method had a wide linear range from 0.1 to 1000μg/L and the LOD was 0.04μg/L, lower than the maximal residual limit (0.5μg/L in drinking water) issued by the World Health Organization. This kind of PDA@AgNPs substrate could be developed into a promising assay for on-field SERS detection with the help of portable Raman equipment.
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