Tannin-furanic foams used as biomaterial substrates for SERS sensing in possible wastewater filter applications

Abstract Simple substrates for surface enhanced Raman spectroscopy (SERS), producible in a cost-efficient way, are of growing interest both scientific and environmental applications. In this study, we demonstrate the use three types bio-based tannin-furanic rigid foams as precursor materials SERS substrates. Coated with silver layer, these allowed detection several well-known analytes mM regime by spectroscopy. Specific optimization standard foam morphology tuning chemical synthesis led to smaller more homogeneously distributed pore structure, supplying active hot spot areas. Thus, obtained significant increase lower relative deviation (RSD) signal recorded over mapped substrate area, analytes, particular Malachite Green dye. This work represents feasibility study opening potential applications biopolymers fields such water pollutants, virtually combining filtration capabilities driven controlled porosity.