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(a) UV-Vis absorbance for AgNPs colloidal solutions by using different concentrations of AgNO3 (0.5–2 mmole/L), with 1 g/L starch and 20 g/L NaOH at 60°C for 60 minutes. (b) UV-Vis absorbance for AgNPs colloidal solutions at different temperatures, using 1 g/L of starch with 20 g/L NaOH, 1 mmole/L AgNO3. (c) UV-Vis absorbance for AgNPs colloidal solutions at different ratios between starch and AgNO3; the experiments are carried out at 60°C for 60 minutes.
