1.1.1 Reagents
1% Chloroauric acid (HauCl4), trisodium citrate dehydrate (Na₃C₆H₅O₇), hydrochloric acid (HCl) and nitric acid (HNO3) were purchased from Sigma-Aldrich (Sydney, Australia). Milli-Q water (18.2 MΩ ⋅ cm at 25 °C) was used for all aqueous solutions.