Synthesis and characterization of core-shell europium(III)-silica nanoparticles

摘要

Luminescent core-shell europium(III)-silica nanoparticles were prepared using europium(III) chelate core structure and polyvinylpyrrolidone synthesis strategy for silica shell. Europium(III): naphtoyltrifluoroacetone: trioctylphosphineoxide complex was spontaneously agglomerated from organic solvent to water. Polyvinylpyrrolidone was adsorbed onto the core structure and stable silica shell was synthesized using tetraethylorthosilicate. Nanosized particles with a diameter of 71 +/- 5 nm and 11 nm shell thickness were obtained with fluorescence decay rate of 517 mu s and excitation and emission wavelengths of 334 and 614 nm, respectively.