Aqueous Synthesis of Gold Nanoparticles

To achieve the aqueous reduction of Au³⁺ to Au⁰, QPABA was utilized as a bifunctional reducing and stabilizing agent. A standard 1 mM aureate solution (HauCl₄·3H₂O) was prepared in a cleaned 50 mL vial. 5 mM of QPABA was also prepared in another 50 mL vial. In a one-pot chamber, 200 μl aliquots of gold and 200 μl of QPABA solution were reacted with the addition of 1000 μl of distilled water at room temperature (25 °C). Table 1 shows the series of reaction setups for the synthesis of AuNSs. The spectrophotometric measurements of the samples were performed using Agilent Cary 3500 Multicell UV-Vis Spectrophotometer. AuNS were purified via centrifugation at 3500 rpm for 10 minutes and dried for further characterization.^{19 (link)}Scheme 2 demonstrates the synthesis of anisotropic gold nanoparticles.