Same-charge maghemite NPs act as a hydrodynamic net to concentrate SERS active AgJ13NPs, enabling uniform “hot spots” and reproducible Raman detection of low analyte concentrations.
The surface functionalization of silver nanoparticles (NPs) by Raman reporters has stimulated a wide interest in recent years for the design of Surface-Enhanced Raman Spectroscopy (SERS) labels. However, silver NPs...