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J Am Chem Soc. 2011 Sep 14;133(36):14164-7. doi: 10.1021/ja202815y. Epub 2011 Aug 22.

Size of elementary clusters and process period in silver nanoparticle formation.

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  • 1Research and Development Center, Bando Chemical Industries, Ltd., Kobe 650-0047, Japan.


The time dependence of small-angle X-ray scattering (SAXS) curves for silver nanoparticle formation was followed in situ at a time resolution of 0.18 ms, which is 3 orders of magnitude higher than that used in previous reports (ca. 100 ms). The starting materials were silver nitrate solutions that were reacted with reducing solutions containing trisodium citrate. The SAXS analyses showed that silver nanoparticles were formed in three distinct periods from a peak diameter of ca. 0.7 nm (corresponding to the size of a Ag(13) cluster) during the nucleation and the early growth period. The Ag(13) clusters are most likely elementary clusters that agglomerate to form silver nanoparticles.

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