Abstract
Monodispersed SiO2@Eu(MABA-Si)·(phen) core-shell microspheres were synthesized by silane coupling agent method. The core-shell microspheres was used the europium complex Eu(MABA-Si)·(phen)2·(ClO4)3·2H2O as shell and SiO2 as the inorganic core. The europium complex shell has grafted to silica surface through forming a Si-O-Si bond. The europium complex was synthesized by HOOCC6H4N- (CONH(CH2)3Si(OCH2CH3)3)2 (denoted as MABA-Si) and phen coordinated europium perchlorate. The europium complex has been characterized by element analysis, molar conductivity, 1HNMR and IR. The TEM and SEM showed that the diameter of SiO2 core was about 400 nm and the thickness of the europium complex shell was about 20 nm. Fluorescence spectra illustrated that the core-shell microspheres have stronger fluorescence intensity than the europium complex which was 1.87 times.
Highlights
Core-shell nanometer microspheres are a kind of nanomaterial with a core-shell structure that can be widely applied in making functional fluorescent materials, magnetic materials, electronics, medicine, and so on
The monodispersed SiO2@Eu(MABA-Si)·(phen) core-shell microspheres synthesized by the europium complex grafting to silica surface through forming a Si-O-Si bond
The peak located at 1700, 1417, and 1314 cm-1 were belonged to the νC=O, νC-OH and δO-H of carbonyl, which prove the presence of MABA-Si
Summary
Core-shell nanometer microspheres are a kind of nanomaterial with a core-shell structure that can be widely applied in making functional fluorescent materials, magnetic materials, electronics, medicine, and so on. By coating a layer of organic alkoxysilane complexes, the luminescence properties of core-shell materials can be changed including luminescence intensity, fluorescence quantum efficiency, stability and fluorescence lifetime [1,2,3]. Silane coupling agent is used to prepare the coating structure nanomaterials that was generally described as Y(CH2)nSiX3. We have controlled prepared ternary europium complex Eu(MABA-Si)·(phen)2·(ClO4)3·2H2O. The MABA-Si is a kind of silane coupling agent, which can be coordinated with Eu3+ ions through the carboxyl oxygen atoms of MABA-Si groups, and the second ligand phen can be coordinated with Eu3+. The monodispersed SiO2@Eu(MABA-Si)·(phen) core-shell microspheres synthesized by the europium complex grafting to silica surface through forming a Si-O-Si bond. The luminescent properties of europium complex and core-shell microspheres SiO2@Eu(MABA-Si)·(phen) was discussed in detail
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