Figure 9.

TEM images of the growth progress of gold nanoparticles. After mixing 5 mL 1.71 mM HAuCl4 with 0.8 ml of 3.0 mM Na2S2O3. (a) Product at 40 min, (b) 2 h, (c) 4 h, and (d) 1 day. (e, f, g, and h) show the gain sizes on the gold crystal surface of the products at 40 min, 2 h, 4 h, and 1 day, respectively.

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