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.