Hydrodynamic 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).
Zhang et al. Nanoscale Research Letters 2012 7:337 doi:10.1186/1556-276X-7-337