Figure 2From: Tunability and stability of gold nanoparticles obtained from chloroauric acid and sodium thiosulfate reactionOptical spectra of the nine GNP samples. UV–vis-NIR spectra of the nine GNP samples measured at 1 h after mixing Na2S2O3 with HAuCl4 solution. In these measurements, all the samples were diluted five times with water.Back to article page