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