Figure 2From: Production of aqueous spherical gold nanoparticles using conventional ultrasonic bathUV-visible spectroscopy of synthesised gold suspensions. (a) gold suspension (maximum absorption peak λmax is 528 nm) prepared with 243 kJ (30 min with 135 W ultrasonic power) of sonication; (b) gold suspension (maximum absorption peak λmax is 531 nm) prepared with 729 kJ (90 min with 135 W ultrasonic power) of sonication.Back to article page