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A seed-mediated growth approach to improved monodispersity of nanoparticles that involves controlling nucleation and growth in solution is presented. Using this approach, spheroidal and rod-like gold particles (see Figure) could be prepared in the presence of a rod-like micellar template. The aspect ratio of the particles could be varied from 1 to 10 by varying the ratio of preformed seed to metal salt.
Jana et al. (2001) studied this question.