Study On Surface Enhanced Raman Scattering Of Metal/Mantis Wing Composite Structures

Surface enhanced Raman scattering(SERS)has the advantages of high sensitivity,good selectivity,small water interference and nondestructive analysis.It has broad application prospects in trace detection,and was widely used in food safety monitoring,environmental protection,medical detection and many other fields.At present,one of the greatest challenges in SERS field is to prepare high-performance SERS substrates.Material selection of substrates is also a concern of most researchers.In recent years,in addition to the SERS substrates prepared by noble metal such as gold,silver,copper and semiconductor materials as templates,many researchers have also turned their attention to natural biological materials,such as dragonfly wings,butterfly wings,cicada wings and so on.Based on this,the natural mantis wing(MW)was used as a template,and noble metal nanoparticles were modified to the surface of mantis wing by DC magnetron sputtering combined with physical deposition.Then metal/MW SERS substrates(Cu/MW,Ag/MW,Au/Ag/MW)were successfully prepared by strictly regulating the spacing between metal particles.Furthermore,the SERS performances of the three three-dimensional composite SERS substrates are further studied.The research contents are as follows:Firstly,copper nanoparticles were sputtered on the surface of mantis wing by DC magnetron sputtering to prepare Cu/MW SERS substrate.In the whole process,the thickness of copper film was mainly controlled by controlling sputtering time.Then The substrate was characterized by SEM and X-ray diffraction,and the substrate with strongest Raman signal was screened out by Rhodamine 6G(R6G)solution.The enhancement,stability and reproducibility of the substrate were investigated in depth.Cu/MW SERS substrates were used to detect p-aminophenylthiophenol(4-ATP)and crystal violet(CV)respectively.Secondly,silver nanoparticles were also sputtered onto mantis wing surface by DC magnetron sputtering.Ag/MW SERS substrate was prepared by strictly controlling the sputtering time.SEM was used to characterize the surface morphology of the substrate,and 4-ATP was used as molecular probe to screen the substrate with the best enhancement effect,and the enhancement performance of the substrate was tested.Finally,Au/Ag/MW SERS substrates were prepared by modifying 30 nm gold particles onto the surface of Ag/MW by physical deposition.The surface morphology of the substrate was characterized by SEM,and 4-ATP was used as molecular probe to screen the substrate with best enhancement effect and to test the enhancement performance of the substrate.Then,the homogeneity and reproducibility of the substrate were studied by using R6 G.Finally,cypermethrin,a pesticide residue,was quantitatively detected by Au/Ag/MW SERS substrates.Using mantis wings as template and magnetron sputtering technology to prepare the substrate has the advantages of simple operation,low cost,environmental protection and suitable for large-scale production.