Citation: . PREPARATION AND FLUORESCENT PROPERTIES OF Eu3+-CONTAINING CORE-SHELL NANOPARTICLES*[J]. Chinese Journal of Polymer Science, ;2003, 21(3): 291-296. shu

PREPARATION AND FLUORESCENT PROPERTIES OF Eu3+-CONTAINING CORE-SHELL NANOPARTICLES*

Received Date: 18 March 2002
Revised Date: 28 May 2002

By using a two-stage soapless emulsion polymerization, four kinds of core-shell nanoparticles have been prepared,which are composed of a polystyrene core having an average diameter of 256 nm and a poly(methyl methacrylate-co-acrylicacid) shell. The transmission electron microscopy (TEM) micrographs and the atomic force microscopy (AFM) imagesevidenced the presence of a core-shell structure. In the infrared spectra, the shift of vCOOH to lower wavenumber withincreasing Eu3+ ion content indicates that coordination between the oxygen of the carboxylic group and Eu3+ has occurred.The fluorescence intensity of 5D0-7F2 transition was observed to reach its maximum with a carboxyl group molar percentage of 40% in the shell and an Eu3+/—COO- molar ratio of 1:3.The fluorescence intensity ratio of 5D0-7F2 to 5D0-7F1 transition reached its maximum with an Eu3+/—COO- molar ratio of 1:3 for all the four series.
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