Figure 6.

UV-vis-NIR absorption spectra of AuNPs. UV-vis-NIR absorption spectra of AuNPs observed during the reaction of Au salt (0.4 mM) with detergent (1 wt.%) at different temperature. The inset shows the photographs of the different nanoparticle solutions with color changes during the formation of AuNPs as a function of temperature.

Premkumar et al. Nanoscale Research Letters 2011 6:547   doi:10.1186/1556-276X-6-547
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