National Physical Laboratory

SERS Colloids

SERS Colloids
Average Raman intensity at 1650 cm<SUP>-1</SUP> of an aqueous solution of 0.25 μM rhodamine-6G and citrate-reduced silver colloids, against variations in added KCl concentration (●).  For comparison, the second axis plots the change in the wavelength of maximum absorption in the UV-Vis spectra (∆).