SERS and DFT study of indigo adsorbed on silver nanostructured surface

Experimental SERS spectra of indigo were acquired using ad hoc SERS active substrates consisting of pulsed laser ablated silver nanoparticles deposited onto polishing sheets. A comparison with density functional theory (DFT) computations results performed on an optimized structure, consisting of an indigo molecule adsorbed onto a silver surface made of 16 silver atoms, showed a remarkable matching.153