Synthesis of Silver Nanoprisms. A typical reaction was as
follows, a 100 mL aqueous solution containing AgNO3 (1 ×
10-4 M) and trisodium citrate (3.5 × 10-3 M) was prepared in
a 250 mL flask at 4 °C (ice-bath). Definite amount of NaBH4
was added dropwise into the solution under vigorous stirring.
After being kept in the ice bath for 30 min, the solution was
heated to 70 °C to trigger the reduction of the remaining AgNO3.
For all the reactions, the reaction flasks were wrapped by tinfoil
and the water-bath was coated by the cover to avoid the light.