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Hydrosols containing nanoparticles of Ag and Pt were
prepared by the use of NaBH4 as the reducing agent. A 0.01
M solution of NaBH4 aged for 3 h was
added dropwise up to
0.5 mL to a beaker containing 100 mL of the stock solution of
0.29 mM AgNO3 or 2.6 mM H2PtCl6 under vigorous stirring.
The Ag solution turned light yellow and that of Pt became
yellowish grey due to formation of metal sols. To these
hydrosols was added 20 mL of the 1.668 mM dodecanethiol
solution resulting in a biphasic mixture. Around 1.0 mL of
concentrated HCl was added dropwise under stirring to the
mixture resulting in the transfer of the nanoparticles to the
toluene layer, as evidenced by the color change

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