TEMPLATE SYNTHESIS OF NANOTUBULAR AND NANOPOROUS RARE EARTH OXIDE MATERIALS AND THEIR APPLICATIONS

本项目旨在通过模板法合成纳米孔和纳米管稀土氧化物材料，表征其光学性质，并开发用于合成新型纳米结构材料的新型模板方法。主要研究成果如下：1）以十二烷基硫酸盐为模板，合成了铕掺杂的六方纳米结构和纳米管结构氧化钇，以及无表面活性剂的氧化钇体相。所有生长态的无定形或结晶性差的材料的发光带都很弱，而1000℃煅烧产物的发光带强度明显增强。此外，在纳米管系统中的煅烧产物的频带被增强了约2倍，比体系统。2）首次合成了以十二烷基硫酸盐为模板的稀土（Er，Tm，Yb，Lu）氧化物纳米管，并将其转化为中空结构 ...更多信息 纳米管。结合我们以前的研究，进一步揭示了稀土元素可以根据它们的行为分为三组（Er-Lu，Eu-Ho和La-Sm），以形成取决于它们的离子半径和反应时间的层状，六边形-纳米结构和纳米管十二烷基硫酸盐络合物和金属碳酸盐的任何一个或多个相。发现在向反应混合物中添加十二烷醇时，可以以高度分散的形式获得氧化物纳米管。通过将对氨基苯磺酸阴离子引入稀土氧化物骨架中，制备了一种新型的纳米结构光响应材料。3）基于混合表面活性剂胶束组装的策略，发展了一种新的表面活性剂模板法。首次采用溶致混合表面活性剂六方结构液晶模板合成了外径为6 nm的铂、钯纳米管。类似的模板系统也被用于合成表面积高达364 m^2g^2的羟基磷灰石纳米颗粒<-1>。采用单一表面活性剂模板法合成了苯酚-糠醛和葡萄糖胺-甲醛聚合物纳米管及其复合物。少

This project was intended to synthesize nanoporous and nanotubular rare earth oxide materials by a templating method, characterize their optical properties and develop a novel templating approach for synthesizing new nano-structured materials. The research results are summarized af follows :1)Europium(III)-doped hexagonal-nanostructured and nanotubular yttrium oxides templated by dodecylsulfate assemblies were synthesized, as well as surfactant free bulk oxides. All the as grown materials with amorphous or poorly crystalline frameworks gave weak luminescence bands, whereas the bands for their 1000℃-calcined products showed a remarkable increase in intensity. Moreover, the bands for the calcined products in the nanotube system were enhanced by about two times than those for the bulk system. Three Eu^<3+> sites were detected for all the calcined samples.2)Rare earth (Er, Tm, Yb, Lu) oxide nanotubes templated by dodecylsulfate assemblies were first synthesized and converted into a hollow … More nanotube. In connection with our previous studies it was further revealed that the rare earth elements can be classified into three groups (Er-Lu, Eu-Ho and La-Sm) according to their behavior to form any one or more phases of layered, hexagonal-nanostructured and nanotubular dodecylsulfate complexes and metal carbonates depending on both their ionic radius and reaction time. The oxide nanotubes were found to be obtainable in a highly dispersed form on addition of dodecanol to the reaction mixture. A new nanostructured photo-responsive material was prepared by the incorporation of p-aminobenznesulfonate anions into the rare-earth oxide framework.3)A new surfactant templating approach was developed on the basis of a strategy to make use of mixed surfactant micellar assemblies. Platinum and palladium nanotubes of 6-nm outer diameter were first synthesized from lyotropic mixed surfactant hexagonal-structured liquid crystal templates. A similar templating system was also applied to the synthesis of hydroxyapatite nanoparticles with a surface area of as high as 364 m^2g^<-1>. Phenol-furfural and glucosamine-formaldehyde polymer nanotubes or their complexes were synthesized by a single surfactant templating method. Less