Surface-Enhanced Fluorescence with Shell-Isolated Nanoparticles (SHINEF)

摘要

Li et al. recently developed a new approach for surface-enhanced Raman spectroscopy (SERS), which they termed shell-isolated nanoparticle-enhanced Raman spectroscopy (SHINERS). The plasmon-enhanced Raman signal is provided by Au nanoparticles with an ultrathin silica shell (2 to 4 nm). The enhancing coated Au nanoparticles can be spread as "smart dust" over the surface, and the coating separates them from direct contact with the probed material. The authors also pointed out that the SERS signal disappeared when changing the shell thickness from 2 to 20 nm. In SHINERS, working with an ultrathin shell for the Au/SiO2 nanoparticles is essential to expose the adsorbate to the maximum electromagnetic field from the Au core (enhancement factor is 85 at 4 nm).