Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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The Characterization of Borohydride-Stabilized Nanosilvers in Laponite Sol Using 1H NMR: Its Ligand Exchange Reactions with MUA and TOP

  • Seo, Jae-Seok (Department of Chemistry and Institute of Basic Sciences, College of Advanced Sciences, Dankook University) ;
  • Son, Dong-Min (Department of Chemistry and Institute of Basic Sciences, College of Advanced Sciences, Dankook University) ;
  • Lee, Han-Na (Department of Chemistry and Institute of Basic Sciences, College of Advanced Sciences, Dankook University) ;
  • Kim, Jee-Kwang (Department of Chemistry and Institute of Basic Sciences, College of Advanced Sciences, Dankook University) ;
  • Kim, You-Hyuk (Department of Chemistry and Institute of Basic Sciences, College of Advanced Sciences, Dankook University)
  • Published : 2009.11.20
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Abstract

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.

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