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Europium(III) Complex-Functionalized SiO2@mTiO2 Nanospheres for Al3+-Modulated Multicolor Emission

Chao Bai,Shi He,Huai-Ming Hu,Hui Zeng,Feng Zou,Ji-Jiang Wang

A europium(III) hybrid material Eu(tta)3bpdc-SiO2@mTiO2(Htta = 2-thenoyltrifluoroacetone, H2bpdc = 2,2′-bipyridine-3,3′-dicarboxylic acid) was successfully designed and synthesized by the covalent grafting complex Eu(tta)3bpdc to SiO2@mTiO2core–shell nanosphere. The FT-IR, PXRD, XPS, TEM, HRTEM, SAED, TGA and PL were performed to characterize these materials. The results indicate that core–shell nanosphere structure and anatase crystallites of SiO2@mTiO2are retained well after grafting the europium complex. Hybrid material Eu(tta)3bpdc-SiO2@mTiO2displays uniform nanosphere structure, bright red color and long lifetime, which can serve as a multicolor emission material modulated by using Al3+ions via the cation exchange approach under a single-wavelength excitation. To the best of our knowledge, this work is the first multicolor emissive sensor for Al3+ions based on the lanthanide hybrid material.Keywords:lanthanide hybrid materials;SiO2@mTiO2core–shell nanosphere;bipyridine derivative;multicolor luminescence