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in the final growth solution) of CTAB and a certain quantity of NaOL were dissolved in 250 mL
of warm water (~50 ¡ãC) in a 1L Erlenmeyer flask (Tables S2-S5). The solution was allowed to
cool down to 30 ¡ãC and 4 mM AgNO3 solution, as detailed in Tables S2-S5, was added. The
mixture was kept undisturbed at 30 ¡ãC for 15 min after which 250 mL of 1 mM HAuCl4 solution
3 was added. The solution became colorless after 90 min of stirring (700 rpm) and a certain
volume of HCl (37 wt. % in water, 12.1 M) was then introduced to adjust the pH (Tables S2-S5).
After another 15 min of slow stirring at 400 rpm, 1.25 mL of 0.064 M ascorbic acid (AA) was
added and the solution was vigorously stirred for 30 s. Finally, a small amount of seed solution
was injected into the growth solution (Tables S2-S5). The resultant mixture was stirred for 30 s
and left undisturbed at 30¡ãC for 12 h for NR growth. The final products were isolated by
centrifugation at 7,000 rpm for 30 min followed by removal of the supernatant. No size and/or
shape-selective fractionation was performed.
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