Optically functional nanocomposites with poly(oxyethylene)-based di-ureasils and mesoporous MCM-41

abstract

Di-urea cross-linked poly(oxyethylene) (POE)/siloxane hybrid structure (di-ureasil) was incorporated into the hexagonal array of onedimensional channels of mesoporous silica MCM-41. X-ray diffraction, nitrogen adsorption-desorption, Fourier transform mid-infrared spectroscopy, Si-29 and C-13 nuclear magnetic resonance, transmission electron microscopy and photoluminescence results demonstrate the interaction (covalent grafting and impregnation) between the di-ureasil structure and the silanol groups of the MCM-41 channels, preserving their integrity. The composites are photoluminescent displaying the intrinsic green emission of MCM-41 superposed to the blue and purplish-blue di-ureasil components. Time-resolved spectroscopy provides further support from energy transfer between the mesopourous silica and the di-ureasil matrix. (c) 2006 Elsevier Inc. All rights reserved.

keywords

ORGANIC-INORGANIC NANOCOMPOSITES; LIQUID-CRYSTAL TEMPLATE; MOLECULAR-SIEVES; INFRARED TEMPERATURE; MODIFIED SILICATES; ROOM-TEMPERATURE; LIGHT EMISSION; PHOTOLUMINESCENCE; SURFACE; NMR

subject category

Chemistry; Science & Technology - Other Topics; Materials Science

authors

Fu, LS; Ferreira, RAS; Valente, A; Rocha, J; Carlos, LD

our authors

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