Raman Enhanced Scattering Analysis of 3,4-Benzopyrene Surface Based on Electromagnetic and Chemical Enhancement

Abstract

This study developed a thiocyclodextrin-modified gold nanoparticle composite (SD@AuNPs) for sensitive SERS detection of hydrophobic 3,4-benzo(a)pyrene. Theoretical and experimental analyses revealed electromagnetic-chemical synergy:the electric field strength (|E/E0|=161) is maximum when the AuNPs are 80 nm; host-guest interactions and charge transfer enhanced molecular enrichment and the Raman activity. The enhancement factor of the theoretical model was increased by a factor of 10, reflecting the contribution of chemical enhancement, in agreement with the experimental results. The established synergistic enhancement model lays a theoretical foundation for the design of high-performance substrates, which has the potential for application in the field of environmental monitoring.

Keywords: 3, 4-benzo(a)pyrene, SD@AuNPs, Surface-enhanced Raman scattering, synergistic enhancement mechanism