TEM micrographs of AuNPs produced at different concentrations. TEM micrographs of AuNPs obtained at room temperature with different concentrations of Au salt and detergent. (a) 0.4 mM, 1 wt.%, (b) 0.4 mM, 10 wt%, (c) 0.4 mM, 25 wt%, and (d) 1 mM, 1 wt%.
Premkumar et al. Nanoscale Research Letters 2011 6:547 doi:10.1186/1556-276X-6-547