Xu Huifang, Wei Wei, Zhang Chengliang, Ding Shujiang, Qu Xiaozhong, Liu Jiguang, Lu Yunfeng, Yang Zhenzhong
State Key Laboratory of Polymer Physics and Chemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China.
Chem Asian J. 2007 Jul 2;2(7):828-36. doi: 10.1002/asia.200700017.
This report presents a facile approach for the low-temperature synthesis of crystalline inorganic-oxide composite hollow spheres by employing the bulk controlled synthesis of inorganic-oxide nanocrystals with polymer spheres as templates. The sulfonated polystyrene gel layer can adsorb the target precursor and induce inorganic nanocrystals to grow on the template in situ. The crystalline phase and morphology of the composite shell is tunable. By simply adjusting the acidity of the titania sol, crystalline titania composite hollow spheres with tunable crystalline phases of anatase, rutile, or a mixture of both were achieved. The approach is general and has been extended to synthesize the representative perovskite oxide (barium and strontium titanate) composite hollow spheres. The traditional thermal treatment for crystallite transformation is not required, thus intact shells can be guaranteed. The combination of oxide properties such as high refractive index, high dielectric constant, and catalytic ability with the cavity of the hollow spheres is promising for applications such as opacifiers, photonic crystals, high-kappa-gate dielectrics, and photocatalysis.
本报告介绍了一种简便的方法，通过以聚合物球为模板对无机氧化物纳米晶体进行本体控制合成，来低温合成结晶无机氧化物复合空心球。磺化聚苯乙烯凝胶层可吸附目标前驱体，并诱导无机纳米晶体在模板上原位生长。复合壳的晶相和形态是可调的。通过简单地调节二氧化钛溶胶的酸度，可获得具有锐钛矿、金红石或两者混合的可调晶相的结晶二氧化钛复合空心球。该方法具有通用性，已扩展到合成代表性的钙钛矿氧化物（钛酸钡和钛酸锶）复合空心球。不需要传统的用于微晶转变的热处理，因此可以保证壳的完整性。氧化物的高折射率、高介电常数和催化能力等性质与空心球的空腔相结合，在遮光剂、光子晶体、高κ栅介质和光催化等应用方面具有广阔前景。
