Fabrication of Versatile Fe3O4/GO/Au Composite Nanomaterial as SERS-active Substrate for Detection of Pesticide Residue

Abstract Highly active Fe3O4/GO/Au composite nanomaterial was fabricated as substrate of surface enhanced Raman spectroscopy (SERS) and applied for pesticide residue detection. The three-layer of multifunctional Fe3O4/GO/Au nanoparticles(NPs) was designed by facile method, with high hot spots, and was characterized by various techniques, including Ultraviolet spectrophotometry(UV), X-ray diffraction (XRD), infrared absorption spectrometer(IR), and transmission electron microscopy(TEM). The performance of Fe3O4/GO/Au was evaluated by Raman spectroscopy with R6G as probe molecule to verify its enhancement effect. It exhibited strong Raman signal with 10− 6M of R6G. Furthermore, the presence of Fe3O4/GO/Au nanohybrid enabled the SERS-based method to detect mancozeb, and showed a excellent linear relationship in the range of 0.25-25 ppm. Therefore, the proposed SERS approach holds promise as an auxiliary technique for screening contaminated agricultural products, environment sample and food in the future.