摘要
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.
出处
《无机化学学报》
SCIE
CAS
CSCD
北大核心
2008年第1期93-97,共5页
Chinese Journal of Inorganic Chemistry
基金
国家重点基础研究发展计划(973计划)(No.2003CB615801)
国家自然科学基金(No.20573059)
国家自然科学基金(No.20603019)
云南省院省校合作基金(No.2005YX39)资助项目
关键词
环糊精
超分子壳
钛酸钡
纳米晶
cyclodextrin
supramolecular shell
barium titanate
nanocrystal