The Characterization of Borohydride-Stabilized Nanosilvers in Laponite Sol Using 1 H NMR: Its Ligand Exchange Reactions with MUA and TOP

In borohydride-protected nanosilvers in laponite sol, the silver particles aggregate to form short chains and a dumbbell shape. The $^{1}H$ NMR measurements in this study represent, to our knowledge, the first observation of proton resonances of borohydride-protected nanosilvers in aqueous solution....

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Bibliographic Details
Published in:Bulletin of the Korean Chemical Society 2009, Vol.30 (11), p.2651-2654
Main Authors: Seo, Jae-Seok, Son, Dong-Min, Lee, Han-Na, Kim, Jee-Kwang, Kim, You-Hyuk
Format: Article
Language:Korean
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Summary:In borohydride-protected nanosilvers in laponite sol, the silver particles aggregate to form short chains and a dumbbell shape. The $^{1}H$ NMR measurements in this study represent, to our knowledge, the first observation of proton resonances of borohydride-protected nanosilvers in aqueous solution. Borohydride on nanosilver can be exchanged with 11-mercaptoundecanoic acid (MUA) or trioctylphosphine (TOP). Transmission electron microscopy and UV-Vis spectroscopy data show that the number of aggregated silver nanoparticles decreases upon addition of aforementioned ligands due to the formation of silver MPCs (monolayer-protected clusters). Adsorption of MUA or TOP on nanosilver is confirmed through the observation of broad proton resonances of MPCs in $^{1}H$ NMR spectra.
ISSN:0253-2964
1229-5949