Figure 4From: Tunability and stability of gold nanoparticles obtained from chloroauric acid and sodium thiosulfate reactionHydrodynamic size from dynamic light scattering measurements and the NIR peak wavelengths. NIR peak wavelength and the hydrodynamic size of gold nanoparticles as functions of the molar ratio of HAuCl4/Na2S2O3. (only shows samples 1 to 6 with NIR peaks in the UV–vis-NIR measurable range).Back to article page