期刊
BEILSTEIN JOURNAL OF NANOTECHNOLOGY
卷 10, 期 -, 页码 356-362出版社
BEILSTEIN-INSTITUT
DOI: 10.3762/bjnano.10.35
关键词
anatase; mesoporous; nonaqueous sol-gel; phosphonate
资金
- Agence Nationale pour la Recherche [ANR-16-CE08-0015 SYNCOPE]
- University of Montpellier
- CNRS
Mesoporous TiO2-octylphosphonate hybrid materials were prepared in one step by a nonhydrolytic sol-gel method involving the reaction of Ti(OiPr)(4), acetophenone (2 equiv) and diethyl octylphosphonate (from 0 to 0.2 equiv) at 200 degrees C for 12 hours, in toluene. The different samples were characterized by P-31 magic angle spinning nuclear magnetic resonance, Fourier transform infrared spectroscopy, Raman spectroscopy, X-ray diffraction, and nitrogen physisorption. For P/Ti ratios up to 0.1, the hybrid materials can be described as aggregated, roughly spherical, crystalline anatase nanoparticles grafted by octylphosphonate groups via Ti-O-P bonds. The crystallite size decreases with the P/Ti ratio, leading to an increase of the specific surface area and a decrease of the pore size of the hybrid samples. For a P/Ti ratio of 0.2, the volume fraction of organic octyl groups exceeds 50%. The hybrid material becomes nonporous and can be described as amorphous TiO2 clusters modified by octylphosphonate units, where the octyl chains form an organic continuous matrix.
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