This paper describes the formation of magnetic and fluorescent nanocomposite particles which consist of superparamagnetic Fe3O4 core, SiO2 shell and organic dye （FITC） coating layer on their surface. The obtained nanocomposites possess typical superparamagnetism and exhibit clear green fluorescence image. And their fluorescence emission is pH-dependent, which would be applied to pH sensing. ？2009 Yu Zhang. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All fights reserved.
Yu ZhangShang Wen Yan GongLu JinShuang Man LiZhong Ping ChenMing MaNing Gu
We described a simple one-step process for the synthesis of oleic acid-capped magnetite nanoparticles using the dimethyl sulfoxide(DMSO) to oxidize the precursor Fe^(2+) at 140℃.By adjusting the alkalinity of the reaction system,magnetite nanoparticles with two sizes of 4 and 7 nm could be easily achieved.And the magnetite nanoparticles coated by oleate were well-monodispersed in organic solvent.
Wang, Chun YuHong, Jian MingChen, GongZhang, YuGu, Ning
