Acupressure mat-like nanostructure with improved SERS performance

Bimetallic nanostructures have attracted much attention to prepare surface-enhanced Raman spectrometry (SERS) substrate. In this study, the problem that magnetic target material was difficult to glow in magnetron sputtering was overcome and the ferro-nickel (NiFe) alloy was uniformly sputtered onto the cicada wing (CW) to make the substrate magnetic. Then, the mass-produced and dense silver nanoparticles (AgNPs) were deposited on NiFe film to further optimize the SERS substrate by improving the method of oil-water interface self-assembly. It was worth mentioning that with the deposition of AgNPs, the SERS intensity was significantly enhanced, and the substrate remained magnetic property, polarization-independence, excellent sensitivity and reproducibility. We also calculated the Raman spectra of probe molecule bound to Ag10 clusters to theoretically verify the performance changes of the substrate observed from experiment. The fabricated SERS substrate not only showed excellent Raman performance, but also had grand application potential in food safety detection.& nbsp;

Automated summary

In this study, a bimetallic nanostructure with magnetic and excellent surface-enhanced Raman spectrometry (SERS) performance was successfully prepared. By overcoming the problem of magnetic target material in magnetron sputtering, a ferro-nickel alloy was uniformly sputtered onto cicada wings to make the substrate magnetic. Then, mass-produced and dense silver nanoparticles were deposited on the alloy film to further optimize the SERS substrate. The fabricated SERS substrate showed enhanced SERS intensity, magnetic property, polarization-independence, excellent sensitivity, and reproducibility.