Direct coprecipitation route to monodisperse dual-functionalized magnetic iron oxide nanocrystals without size selection
writer：Li, Zhen; Tan, Bien; Allix, Mathieu; Cooper, Andrew I.; Rosseinsky, Matthew J.
keywords：Nanoparticles
source：期刊
specific source：Small (2008), 4(2), 231-239.
Issue time：2008年
Water-sol. monodisperse superparamagnetic Fe3O4 nanocrystals decorated with two distinct functional groups are prepd. in a single-step procedure by injecting iron precursors into a refluxing aq. soln. of a polymer ligand, trithiol-terminated poly(methacrylic acid) (PMAA-PTTM), bearing both carboxylate and thiol functionalities. The ratio of carboxylic acid groups in the polymer-protecting ligand to the iron precursors plays a key role in detg. the particle size and particle size distribution. The surface functionalities of the ligands allow post-synthesis modification of the materials to produce water-sol. fluorescent magnetic nanocrystals.