Preparation of a high‐performance magnetic molecularly imprinted sensor for SERS detection of cyfluthrin in river

Abstract

AbstractA novel magnetic molecularly imprinted sensor (Fe3O4/GO/Ag‐MIPs) was successfully synthesized. Combining with the technique of surface‐enhanced Raman scattering (SERS), it could be applied to detect cyfluthrin (LC). Herein, GO and Ag particles were anchored on the surface of the Fe3O4@SiO2 to obtain the composite (Fe3O4/GO/Ag), which was prepared as a SERS substrate. Then, the Fe3O4/GO/Ag‐MIPs (FGA‐MIPs) prepared by precipitation polymerization was evaluated as the SERS imprinted sensor for selective detection of LC from aqueous medium. The morphology and structural properties of FGA‐MIPs were characterized by a series of modern analysis measurements. The results proved that FGA‐MIPs possessed wonderful magnetic separation, sensitive SERS detection, and selectivity. Under optimal conditions, it exhibited a good linear relationship (R2 = 0.9926) between the Raman shift (at 1,004 cm−1) and the concentration of LC among 10−3–10−8 mol/L, and the limit of detection was 10−8 mol/L. Meanwhile, the selective experiment indicated that this material owned specific selectivity to the template molecules. Thus, the result of this experiment demonstrated that the FGA‐MIPs was a highly sensitive and selective sensor material in the field of LC detection, and it provided a new approach to other residual pyrethroid detection in the environment water.