Fabrication of GO/Fe3O4@Au MNPs for Magnetically Enriched and Adsorptive SERS Detection of Bifenthrin

The detection of bifenthrin is closely related to the adsorption SERS substrates. In this study, superparamagnetic Fe3O4@Au MNPs coated with GO were used detect and enrichment molecules benzene rings. Firstly, thermal solvent method synthesized Fe3O4 magnetic nanoparticles (MNPs) a particle size ~250 nm. Next, polyethylene imide (PEI) was as an intermediate layer modify surface form positively charged ultra-thin polymer middle layer. gold shell developed by ~20 nm AuNPs, without affecting properties. Then, additional amount colloidal on performance systematically studied. Using crystal violet (CV) probe, we investigated composite nanomaterials. lowest detected concentration reached 10−8 mol/L, confirming that functional material had good activity Finally, substrate in acetone solution, mol/L. These results showed prepared GO/Fe3O4@Au efficient substrates could pesticide residue high sensitivity.