The wavelength dependence of the reaction is also investigated using four different wavelengths (488, 532, 633 and 785 nm) for all nanoparticles, as we plotted the intensity loss for the peak at 1440 cm -1 over time (figure and). We can now fit these curves to obtain kinetic information about the reaction using this data. We have recently shown that even though the kinetics curves obtained through SERS experiments carry little information about the reaction order, they are still very useful to compare the different properties of the studied materials. Here, we fitted the curves using a second-order fractal reaction kinetics equation: