Abstract
Past work on the synthesis of gold nanocrystals has revealed that changing the reaction cell potential enables particle shape evolution. Although various parameters in the Nernst equation has been used to achieve this, adjusting the metal precursor concentration has not been demonstrated before. Using the reported synthetic conditions with cetyltrimethylammonium chloride (CTAC) surfactants to grow gold nanocubes, rhombic dodecahedra, and octahedra as the starting points, fixing the ascorbic acid volume, and tuning the volume of HAuCl4 solution introduced allow the formation of the same series of crystal shape evolution from rhombic dodecahedral to trisoctahedral and cubic structures in the presence of a tiny amount of NaBr. In another series, by gradually increasing the HAuCl4 solution volume but fixing potassium iodide and ascorbic acid volumes, gold nanocrystals with tunable morphologies from octahedra to corner-truncated octahedra, edge- and corner-truncated octahedra, and rhombic dodecahedra can be sy...
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