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Schematic illustration for the formation of the chestnut-like Au nanocrystals. (a) The seeds were dropped into the growth solution. (b) AuCl2− complex was reduced onto the surface of Au0 using electrons from ascorbic acid in the growth solution. (c) Formation of concave nanocubes during the initial growth period. (d) The radial growth of [111]-oriented nanoneedles. (e) The branched growth on the formed nanoneedles. (f) The chestnut-like Au nanocrystal.
