Figure 1.

GNP samples after mixing Na2S2O3and HAuCl4solutions. The GNP solutions after mixing 2.2, 2.0, 1.8, 1.6, 1.4, 1.2, 1.0, 0.8, and 4.0 mL (samples 1 through 9, respectively) of 3.0 mM Na2S2O3 with 5 mL of 1.71 mM HAuCl4 at 1 h and 1 day, respectively. Photos were taken after the samples were diluted five times with water.

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