沉积法自组装三维有序的Eu(DBM)_3Phen/SiO_2胶体球(英文)

Self-assembly of 3D Ordered Eu(DBM)_3Phen/SiO_2 Colloidal Spheres via Sedimentation

采用修饰的St ber法合成了300 nm的Eu(DBM)3Phen/SiO2胶体杂化球,并通过沉积法将这种胶体杂化球组装成厚度为5 mm,面积为12 cm2的三维有序结构。通过扫描电子显微镜观察发现这些胶体球在垂直于烧杯底面的所有层面中都显示了立方密堆积的结构。元素分析进一步证实了荧光分子被包埋在SiO2胶体球中。在355 nm的激发下,这种三维有序结构具有铕离子的特征发射。

300 nm Eu（ DBM ）3 Phen/SiO2 colloidal hybrid spheres were synthesized by modified Stobor method. The silica spheres were self-assembled＇ into 3D ordered crystal structure with 5 mm thick and over relative large areas （ 12 cm2 ） via sedimentation. The scanning electron microscopy （ SEM ） images indicate that the cubic-close-packed structure extends almost all of the layers along the direction perpendicular to the surface of the bottom of the beaker and the close-packed order extends throughout the colloidal crystal. Furthermore, elemental analysis of silica spheres by EDAX establishes that the fluorescent molecules contained in the SiO2 colloidal spheres. Under 355 nm continuous excitation, the ordered structure exhibits characteristic emission of trivalent europium ions.