Au@Ag/U-Cn/Graphene Composite Sers Film Based on Pdms Substrate with Stable, Flexible and Self-Cleaning Capability

Abstract

SERS has received a considerable amount of attention as a fast, sensitive and non-destructive test. Most substrates, however, are either limited by expensive costs and complex assays, or exhibit poor enhancement and sensitivity. In this study, the flexible SERS films with self-cleaning ability were prepared by stacking multiple materials. the introduction of U-CN and graphene enabled the flexible SERS films to exhibit outstanding photocatalytic ability and stability. For R6G solution, the flexible SERS films showed excellent detection sensitivity and environmental stability, where the lowest detection concentration reached 10-12 M. The experimental results of photocatalytic degradation confirmed the superior self-cleaning effect of the prepared flexible film, and the SERS signal intensity only decreased by about 12% after five recycling detections. The recyclable detection capability, prominent enhancement effect and excellent environmental adaptability and stability make the prepared flexible composite film a new generation of SERS detection substrate, which is of great significance in Raman detection.

Keywords: Surface enhanced Raman scattering, Au@Ag nanoparticles, Self-cleaning, Flexible film, Storage stability