Additional file 3.

Plasmon peak position and absorbance value as a function of chloroauric acid concentration. The chloroauric acid concentration ranging from 0.01 to 1 mM. The data is plotted on a logarithmic scale. As the HAuCl4 concentration increases the absorbance intensity increases with an accompanying red-shift of the plasmon peak position.

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Young et al. Nanoscale Research Letters 2011 6:428   doi:10.1186/1556-276X-6-428