“…In addition, while comparing with the free RIF molecule, the SERS spectrum of the MFBL/RIF sample shows the onset of five new bands at 527, 571, 762, 1353, and 1390 cm −1 . The SERS bands found at 571 and 1353 cm −1 are, respectively, assigned to the vibrational modes δ (C–OH) and ν (C–OH), whereas the bands peaking at 527, 762, and 1390 cm −1 are associated to the ring's vibrational modes, namely, δ (C–C) and ν (C–C) . Furthermore, while adsorbed onto the magnetite nanoparticle's surface, the RIF molecule's SERS bands associated with the δ (C–O − ) at 466 cm −1 , δ (C=O) at 496 cm −1 and ring stretching modes at 1435 and 1509 cm −1 are quenched .…”