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Figure 2: Citrate-stabilized seed particles. (a) TEM and HRTEM images of as-prepared particles. TEM images of the particles (b) 10 s and (c) 20 s after being added to the growth solution. (d) Optical extinction spectra of the seed and growth solutions, a mixture of the seed (1 mL) and growth (2 mL) solutions, and a mixture of the growth solution (2 mL) and H2O (1 mL). Reproduced with permission from [18]. Copyright 2009 Elsevier.