Combined Electrostatic-Covalent Building of Au NPs Multilayers and Their Size-Enhanced Cohesive and SERS Properties

Figure 5

UV-Vis absorption spectra of gold colloidal solutions. The thin line corresponds to the spectral response of the nanocolloidal solution of average particles size of 15 nm, as previously determined by TEM in Figure 3. The broad line represents the nanocolloidal solution of average particles size of 5 nm, as previously determined by TEM in Figure 3.