Luminescent europium complexes encapsulated in cage-like cubic ordered mesoporous silica

被引:31
作者
da Silva, L. C. Cides
Martins, T. S.
Filho, M. Santos
Teotonio, E. E. S.
Isolani, P. C.
Brito, H. F.
Tabacniks, M. H.
Fantini, M. C. A.
Matos, J. R. [1 ]
机构
[1] Univ Sao Paulo, Inst Quim, Dept Quim Fundamental, BR-26077 Sao Paulo, Brazil
[2] Univ Sao Paulo, Inst Fis, Dept Fis Aplicada, BR-66318 Sao Paulo, Brazil
[3] Ctr Aerosp Technol, Inst Tecnol Aeronaut, Dept Quim, BR-12228900 Sao Jose Dos Campos, SP, Brazil
基金
巴西圣保罗研究基金会;
关键词
FDU-1; silica; Europium complex; luminescence; cage-like highly ordered mesoporous cubic structures;
D O I
10.1016/j.micromeso.2005.08.037
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
FDU-1 is a highly ordered, large-pore silica with a cage-like mesoporous cubic structure. FDU-1 was synthesized from tetraethyl orthosilicate (TEOS) in the presence of poly(ethylene oxide)-poly(butyle oxide) poly(ethylene oxide) triblock copolymer (PEO-PBO-PEO) template in strongly acid media, using a microwave oven as heating source. Rare earth complexes were encapsulated in ordered mesoporous silica in order to improve their thermal stability, necessary for applications. Eu(dbm)(3) center dot TPPO (dbm = dibenzoylmethane and TPPO = triphenylphosphine oxide) and Eu(pic)(3) center dot 2Leu center dot 5H(2)O (pic = picrate and Leu = L-leucine) were encapsulated into FDU-1 silica and modified FDU-1 silica by 3-aminopropyltriethoxysilane (APTES). Thermogravimetry/derivative thermogravimetry (TG/DTG) showed that the decomposition temperature increased after encapsulation of the complex. Small angle X-ray diffraction (SAXRD) results showed that the mesoporous silica remains ordered after the encapsulation of the europium complexes. Rutherford back-scattering spectrometry (RBS) revealed a much higher Eu encapsulation for the dibenzoylmethane complex compared to picrate and, with a weight percent similar to the nominal concentration of Eu set at the synthesis process. All infrared spectra are similar and present the profile of amorphous silica. The complexes in FDU-1 silica still present luminescence. (c) 2005 Elsevier Inc. All rights reserved.
引用
收藏
页码:94 / 100
页数:7
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