Combined small-angle x-ray scattering/extended x-ray absorption fine structure study of coated Co nanoclusters in bis(2-ethylhexyl)sulfosuccinate

Chemically stable cobalt nanostructures have been prepared with Co(II) reduction in the confined space of cobalt bis(2-ethylhexyl)sulfosuccinate, Co ( AOT ) 2 , reverse micelles dispersed in n -heptane. The reaction was carried out by adding a solution of sodium borohydride in ethanol (1% weight) to...

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Bibliographic Details
Published in:Journal of applied physics 2009-06, Vol.105 (11), p.114308-114308-7
Main Authors: Longo, A., Giordano, F., Giannici, F., Martorana, A., Portale, G., Ruggirello, A., Turco Liveri, V.
Format: Article
Language:English
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Summary:Chemically stable cobalt nanostructures have been prepared with Co(II) reduction in the confined space of cobalt bis(2-ethylhexyl)sulfosuccinate, Co ( AOT ) 2 , reverse micelles dispersed in n -heptane. The reaction was carried out by adding a solution of sodium borohydride in ethanol (1% weight) to a 0.2 M micellar solution of Co ( AOT ) 2 in n -heptane at a reductant to Co(II) molar ratio of 4. This procedure involves the rapid formation of surfactant-coated Co nanoparticles followed by their slow separation as nanostructures embedded in a sodium bis(2-ethylhexyl)sulfosuccinate matrix. The resulting composites, characterized by extended x-ray absorption fine structure and small-angle x-ray scattering, showed the presence of subnanometer sized cobalt nanoparticles aggregated together to form elongated structures coated by the surfactant molecules.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.3133131