Size and shape control for water-soluble magnetic cobalt nanoparticles using polymer ligands
writer：Lu, Le Trong; Tung, Le Duc; Robinson, Ian; Ung, Diane; Tan, Bien; Long, James; Cooper, Andrew Ian; F
keywords：Nanoparticles
source：期刊
specific source：Journal of Materials Chemistry (2008), 18(21), 2453-2458.
Issue time：2008年
We report a synthesis of monodisperse water-sol. magnetic Co nanoparticles using a facile redn. method in aq. media in the presence of alkyl thioether end-functionalized poly(methacrylic acid) (PMAA-DDT) ligands. The size and shape of the nanoparticles are both tunable by varying synthesis conditions. The size of the spherical nanoparticles can be tuned between 2-7.5 nm by changing the concn. of the polymer. Our synthesis approach also provides a route for producing much larger spherical nanoparticles of 80 nm as well as anisotropic nanorods of 15 36 nm. The spherical nanoparticles are superparamagnetic at room temp. The nanoparticles can be stable in water for up to eight weeks when 0.12 mM PMAA-DTT with mol. wt. of 13500 g mol-1 is used as ligand.