Additional file 4.

pH values before and after AuNP synthesis. pH values for given HAuCl4 concentrations ranging from 0.02 to 0.1 mM in 0.01 mM increments and from 0.1 to 0.5 mM in 0.1 mM increments. The x-axis is plotted on a logarithmic scale. The inset shows the pH values of the AuNP solutions from 0.01 to 0.1 mM and is plotted on a linear scale. As the reduction of HAuCl4 by CO takes place, H+ ions are liberated decreasing the pH of the solution. All pH measurements were taken at room temperature.

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