Fig. 2From: Concentration Effect of Reducing Agents on Green Synthesis of Gold Nanoparticles: Size, Morphology, and Growth MechanismDigital images of AuNPs. The final concentration of caffeic acid is a 0.008, b 0.04, c 0.08, d 0.12, e 0.16, f 0.2, g 0.24, h 0.28, i 0.4, j 0.48, and k 0.56 mM. The final concentration of Au3+ ions is fixed at 0.2 mM. The detailed reaction procedure is described in the experimental sectionBack to article page