Figure 2.

Optical spectra of the nine GNP samples. UV–vis-NIR spectra of the nine GNP samples measured at 1 h after mixing Na2S2O3 with HAuCl4 solution. In these measurements, all 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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