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. 2014 Nov 23;9(1):627. doi: 10.1186/1556-276X-9-627

Figure 4.

Figure 4

Effects of KAuCl4 concentrations on AuNP synthesis. (A) TEM images at (a) 0.5 mM KAuCl4, abundance of spheres; (b) 1 mM KAuCl4, abundance of spheres; (c) 1.5 mM KAuCl4, formation tending to bulk gold; and (d) 2 mM KAuCl4, bulk gold [Reaction conditions: 1 mL YFLE, pH 4.2, and 22°C to 24°C temperature]. (B) UV–vis spectrophotometry validation of AuNPs shown in Figure 4A (a-d).