Green Synthesis of Silver Nanoparticles Via Bougainvillea Spectabilis (leaves and Stem) for Pyridoxine SERS Sensing

In this study, leaves, and stem extracts of the Bougainvillea spectabilis (BS) plant were used separately as reducing and stabilizing agents to obtain silver nanoparticles (AgNPs). The UV-Vis characterizations show different positions to the absorption band associated with surface plasmon resonance (SPR) in AgNPs. The absorption bands centered at 372 and 435 nm were observed with the stem and leaves extract, respectively. In both cases, these behaviors were associated with SPR in AgNPs. TEM (transmission electron microscopy) micrographs reveal relatively spherical morphologies, with particle diameters around 11 nm with a hexagonal phase. AgNPs were evaluated as SERS (surface enhanced Raman spectroscopy) substrates detecting pyridoxine at low concentrations. The theoretical results indicate a possible charge transfer between the two systems and susceptibility to Raman activity enhancement on the radial breathing mode type of the pyridinic ring located at approximately 690 cm−1.