Figure 2.

UV-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.

Lee et al. Nanoscale Research Letters 2012 7:420   doi:10.1186/1556-276X-7-420
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