Table 2

The respective conditions for the syntheses of Au20, Au24,and mixed Au39/40
Cluster size Stage I Stage II Amount of NaBH4(concentration, 0.44 M) per mole of gold and speed of addition Aging time
Stirring speed at the stage of Au(III) reduction to Au(I) by 3X HSC2H4Ph Stirring speed at the stage of Au(I) reduction to clusters by NaBH4
1 Au20 Stationary Approximately 50 rpm 1 mL (1×), dropwise added over a 30-min period Approximately 6 hrs
2 Au24 50 to 100 rpm Approximately 100 rpm 1 mL (1×), dropwise added over a 15-min period Overnight
3 Au39/40 50 to 100 rpm Approximately 400 rpm 1 mL (1×), dropwise added over a 15-min period Overnight
4 Au25 50 to 100 rpm 50 to 400 rpm 5 mL (5×), Dropwise added over a 50-min period Overnight

Meng et al.

Meng et al. Nanoscale Research Letters 2012 7:277   doi:10.1186/1556-276X-7-277

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