Abstract
Crystal structures of gold nanorods synthesized electrochemically using micelles as a capping material have been studied by high-resolution transmission electron microscopy. Short gold nanorods with aspect ratios of 3–7 are enclosed mainly by {100} and {110} facets and their axial growth direction is [001], whereas long gold nanorods of aspect ratios 20–35 are dominated by {111} and {110} facets and their growth axial direction is 〈112〉. The short rods are the dominant constituents, whereas the long rods are observed occasionally. Spherical-like Au particles with equivalent mass to the short rods are dominated by {111} and {100} facets with shapes of truncated octahedra, icosahedra and decahedra. The unique {110} facets of Au nanorods are expected to have interesting surface properties.
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