Figure 8From: Tunability and stability of gold nanoparticles obtained from chloroauric acid and sodium thiosulfate reactionThe evolution of the optical absorption spectrum of three samples. With different volume ratios of HAuCl4 and Na2S2O3 during the reactions: (a) 5 ml HAuCl4 + 2.2 ml Na2S2O3, (b) 5 ml HAuCl4 + 1.4 ml Na2S2O3, and (c) 5 ml HAuCl4 + 0.8 ml Na2S2O3. Samples were taken during the reaction and diluted five times with DI water then immediately measured by UV–vis-NIR spectrophotometer.Back to article page