β-环糊精作为超分子壳制备BaTiO_3纳米晶体

Synthesis of c Nanocrystals with β-Cyclodextrin as a Supramolecular Shell

介绍了一种以环境友好的β-环糊精(β-CD)为超分子壳合成纳米钛酸钡的水热方法。经样品X射线衍射(XRD),透射电镜(TEM)和选区电子衍射(ED)表征证实,合成的钛酸钡为纯立方相的纳米单晶,结晶度好;热重(TG)和红外光谱(IR)研究表明,β-CD在水热条件下自组装为超分子壳的配位或空间位阻作用,导致了BaTiO3晶体生长过程中的快速均匀成核和慢生长。β-CD的添加能明显抑制钛酸钡的粒径增长和颗粒团聚,窄化其粒径分布(平均粒径:42±5nm)。

Well-dispersed barium titanate（BaTiO3）nanocrystals were prepared by a hydrothermal method with β-cyclodextrin（β-CD）as a supramolecular shell.The nanocrystals were identified as cubic phase single-crystal by X-ray diffraction（XRD）and Electron diffraction（ED）.The particle size and shape were characterized by transmission electron microscopy（TEM）.Infrared spectroscopy analysis（IR）and thermogravimetric analysis（TG）were used to investigate the growth mechanism.Uniform and well-dispersed barium titanate（BaTiO3）nanocrystals were formed due to rapid and homogeneous nuclei and slow growth of BaTiO3 crystals when β-CD was used during the synthesis process as a supramolecular shell because of its coordination and steric hindrance.