Synthesis of TiO2鈥揚oly(3-hexylthiophene) Hybrid Particles through Surface-Initiated Kumada Catalyst-Transfer Polycondensation

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• 作者：Florian Boon ; David Moerman ; Danielle Laurencin ; S茅bastien Richeter ; Yannick Guari ; Ahmad Mehdi ; Philippe Dubois ; Roberto Lazzaroni ; S茅bastien Cl茅ment
• 刊名：Langmuir
• 出版年：2014
• 出版时间：September 30, 2014
• 年：2014
• 卷：30
• 期：38
• 页码：11340-11347
• 全文大小：444K
• ISSN：1520-5827

文摘

TiO₂/conjugated polymers are promising materials in solar energy conversion where efficient photoinduced charge transfers are required. Here, a 鈥済rafting-from鈥?approach for the synthesis of TiO₂ nanoparticles supported with conjugated polymer brushes is presented. Poly(3-hexylthiophene) (P3HT), a benchmark material for organic electronics, was selectively grown from TiO₂ nanoparticles by surface-initiated Kumada catalyst-transfer polycondensation. The grafting of the polymer onto the surface of the TiO₂ nanoparticles by this method was demonstrated by ¹H and ¹³C solid-state NMR, X-ray photoelectron spectrometry, thermogravimetric analysis, transmission electron microscopy, and UV鈥搗isible spectroscopy. Sedimentation tests in tetrahydrofuran revealed improved dispersion stability for the TiO₂@P3HT hybrid material. Films were produced by solvent casting, and the quality of the dispersion of the modified TiO₂ nanoparticles was evaluated by atomic force microscopy. The dispersion of the P3HT-coated TiO₂ NPs in the P3HT matrix was found to be homogeneous, and the fibrillar structure of the P3HT matrix was maintained which is favorable for charge transport. Fluorescence quenching measurements on these hybrid materials in CHCl₃ indicated improved photoinduced electron-transfer efficiency. All in all, better physicochemical properties for P3HT/TiO₂ hybrid material were reached via the surface-initiated 鈥済rafted-from鈥?approach compared to the 鈥済rafting-onto鈥?approach.