Multifunctional composite (MFC) di-ureasil hybrid synthesized by sol gel method containing phosphotungstic acid (PWA) and Eu3+ ions have been successfully incorporated into mesoporous silica (SBA-15) by post-synthesis method. MFC were characterized by Fourier transform-infrared spectroscopy (FTIR), small angle X-ray scattering (SAXS), nitrogen adsorption–desorption (NAI), thermogravimetric and differential thermal analysis, transmission electron microscopy (TEM) and also photoluminescence. FTIR showed that both di-ureasil and PWA were incorporated into the mesoporous silica. NAI, TEM and SAXS confirmed the incorporation of the PWA and di-ureasil into the mesoporous of SBA-15. Composites are thermal stable at about 240 °C and photoluminescence has demonstrated that Eu3+ ions were successfully entrapped and occupies local environment with low symmetry.
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The authors acknowledge the financial support from Brazilian agencies: Grants 2012/02708-8, São Paulo Research Foundation (FAPESP). CAPES (Education Ministry) (23038.000776/201754) via the projects of the National Institute for Science and Technology on Organic Electronics (INEO). Authors also would like to thank Chemistry Institute, São Paulo State University – UNESP, Araraquara – SP for photoluminescent measurements. The authors also would thank Ms. A.C.F. Silveira and Prof. M.C.A. Fantini from Instituto de Física (USP) for SAXS analysis, C.M. Fukumoto, R.M. da Silva, R. Rodrigues and S. Pinheiro from CIPE-UNIFESP (Centro de Instrumentação de Pesquisa e Ensino-UNIFESP) for NAI analysis, and Sylvia Carneiro of Institute Butantan, São Paulo for TEM measurements.
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Cavalcante, C.T., Molina, C. & Martins, T.S. Synthesis and characterization of ordered mesoporous silica containing di-ureasil hybrid/phosphotungstic acid and Eu3+. J Mater Sci: Mater Electron 30, 16903–16909 (2019). https://doi.org/10.1007/s10854-019-01626-0