Construction And Performance Of Electrochemical Sensor Based On Transition Metal Oxide Multi Material Modification

The abuse of antibacterial drugs is an important problem facing the world.When these antibacterial drugs are directly or indirectly discharged into the environment,they will cause serious harm to the environment.In order to alleviate this hazard,it is of great significance to detect the residual antibacterial drugs in the environment.Among them,electrochemical sensors are expected to become a new means of detecting antibacterial drugs.Choosing appropriate materials to construct corresponding electrochemical sensors is an important step.Graphene and transition metal oxides have unique applications in the electrochemical field.This research is based on the above The two materials constitute an electrochemical sensor to detect metronidazole and sulfamonomethoxine.A facile synthesis strategy of reduced graphene oxide(RGO)-octahedral Mn₃O₄(oct-Mn₃O₄)nanocomposites using in situ one-pot hydrothermal reaction was reported.Graphene oxide(GO)was reduced by in situ one-pot hydrothermal reaction while oct-Mn₃O₄ nanostructures were successfully synthesized on the surface of RGO.The RGO-oct-Mn₃O₄ nanocomposites were characterized by scanning electron microscopy(SEM),Raman spectra,Infrared spectrophotometry(IR),and X-rays diffraction(XRD).The RGO-oct-Mn₃O₄ nanocomposites were drop-casted onto the surface of glassy carbon electrode(GCE)to obtain RGO-oct-Mn₃O₄/GCE.The prepared RGO-oct-Mn₃O₄/GCE showed good electrochemical response in the reduction of MNZ and oxidation of SMM.This may be due to the larger effective surface area and more active sites of RGO-oct-Mn₃O₄/GCE,as well as the excellent electrochemical performance of octahedral Mn₃O₄.DPV results revealed that the performance of RGO-oct-Mn₃O₄/GCE towards metronidazole displayed a linear ranging from 0.1 to 9.5?M with a detection limit of 0.037?M.For sulfamonomethoxine,it exhibited a linear ranging from 1 to 95?M with a detection limit of 0.27?M.Moreover,the proposed sensor had good anti-interference capability high stability,satisfactory reproducibility,and was successfully applied in real samples.