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. 2015 Aug 1;1(1):FSO54. doi: 10.4155/fso.15.54

Figure 2. . Synthesis of gold nanoparticles.

Figure 2. 

HAuCl4 is reduced by sodium borohydride in the presence of a stabilization agent, a thiol (-SH) ligand. The thiol ligand is exchanged by another thiol reagent carrying a desired functional group (x) that can be derivatized into a final product (y).