Memesa Mine, Lenz Sebastian, Emmerling Sebastian G J, Nett Sebastian, Perlich Jan, Müller-Buschbaum Peter, Gutmann Jochen S
Colloid Polym Sci. 2011 Jun;289(8):943-953. doi: 10.1007/s00396-011-2421-0. Epub 2011 Apr 2.
Titania nanoparticles are prepared by sol-gel chemistry with a poly(ethylene oxide) methyl ether methacrylate-block-poly(dimethylsiloxane)-block-poly(ethylene oxide) methyl ether methacrylate triblock copolymer acting as the templating agent. The sol-gel components-hydrochloric acid, titanium tetraisopropoxide, and triblock copolymer-are varied to investigate their effect on the resulting titania morphology. An increased titania precursor or polymer content yields smaller primary titania structures. Microbeam grazing incidence small-angle X-ray scattering measurements, which are analyzed with a unified fit model, reveal information about the titania structure sizes. These small structures could not be observed via the used microscopy techniques. The interplay among the sol-gel components via our triblock copolymer results in different sized titania nanoparticles with higher packing densities. Smaller sized titania particles, (∼13-20 nm in diameter) in the range of exciton diffusion length, are formed by 2% by weight polymer and show good crystallinity with less surface defects and high oxygen vacancies.
二氧化钛纳米颗粒通过溶胶 - 凝胶化学法制备，以聚（环氧乙烷）甲基醚甲基丙烯酸酯 - 嵌段 - 聚（二甲基硅氧烷） - 嵌段 - 聚（环氧乙烷）甲基醚甲基丙烯酸酯三嵌段共聚物作为模板剂。改变溶胶 - 凝胶组分——盐酸、四异丙醇钛和三嵌段共聚物——以研究它们对所得二氧化钛形态的影响。二氧化钛前驱体或聚合物含量的增加会产生更小的初级二氧化钛结构。用统一拟合模型分析的微束掠入射小角X射线散射测量揭示了有关二氧化钛结构尺寸的信息。通过所使用的显微镜技术无法观察到这些小结构。通过我们的三嵌段共聚物，溶胶 - 凝胶组分之间的相互作用产生了具有更高堆积密度的不同尺寸的二氧化钛纳米颗粒。由2％重量的聚合物形成的直径约为13 - 20纳米的较小尺寸的二氧化钛颗粒，处于激子扩散长度范围内，具有良好的结晶度，表面缺陷较少且氧空位较高。
