科研之友
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摘要
Fluorene-di-ammonium-functionalized mesoporous silica (FDMS) was prepared through post synthesis grafting method of SBA-15. The obtained material was characterized by means of small and wide angle X-ray diffraction, nitrogen adsorption-desorption, Fourier transform infrared spectroscopy, Raman spectroscopy, thermo gravimetric analysis and elemental analysis. The results showed that the original structure of SBA-15 is preserved after the post grafting procedure. Surface area, pore size and pore volume decreased by attaching functional groups to the pore surface. The grafted amount of fluorene on the surface of SBA-15 was 0.50 mmol with yield about 40.6%. The emission spectra of FDMS was studied in acid media and discussed in details. Computational studies were performed in order to obtain a detailed electronic description of the mechanism of FDMS fluorescence by H+ as well as studying the structure and bonding in the (FDMS) H+. The structural change between FDMS and protonated form can serve as an effective candidate for pH-indicator, and might be used as acid-dependent molecular-sensor models for advanced applications in optical sensors in the future.
- 出版日期2016-4
