Gold nanoparticles are generally synthesized via the seedmediated growth method . Typically, very small gold nanomaterial (seed) that is prepared separately or in situ are mixed with surfactants, Au 3+ ions, and reductants, after which they are kept for hours. Subsequently, the Au 3+ ions are reduced into Au + in the solution, and the colliding Au + ions with the seed or growing nanomaterial reduces into Au atoms on the surface . Owing to the randomized collision process, almost all the previous gold nanomaterials exhibit symmetry, such as spherical, rod-like, and triangular shapes, or no symmetry, such as nanourchin . As far as we know, only a few types of moderately symmetrical non-rod-like gold nanomaterials with high efficiency are known; they include gold nanoflowers, gold nanostar, and DNAprogramable overgrowth of GNRs .