TEM images of temporal evolution of GNPs after the labeled reaction time. These samples were obtained from the reaction process at 85°C in the presence NaOH with a concentration of (A) 6.0 mM, (B) 7.7 mM, and (C) 9.5 mM, respectively. Scale bar: 50 nm in (A) and 20 nm in (B, C).
Li et al. Nanoscale Research Letters 2011 6:440 doi:10.1186/1556-276X-6-440