光纤圆柱曲面基底胶体微球的自组装

Self-Assembly of Colloidal Microspheres on the Cylindrical Substrate of Optical Fibers

以标准单模光纤包层的外表面作为基底,通过改进的恒温蒸发对流引导合理控制溶剂蒸发温度和液体表面下降的速度,使用垂直沉积法在其曲面圆柱型基底涂覆三维二氧化硅胶体晶体。单模光纤垂直插入二氧化硅胶体溶液中,处于圆形容器的中心,在毛细力的驱动下胶体微球在光纤外表面形成三维的胶体晶体薄膜。实验所用二氧化硅微球平均粒径为390 nm,晶体生长时间仅为12 h。用扫描电子显微镜(SEM)分析了样品的表明形貌:确定了样品表面面心立方结构的[111]和[100]两种晶向排列,同时发现了[100]晶向之间有规律的[111]晶向排列的交叉图案。对胶体微球不同的晶向排列以及交叉图案进行了定性的分析和讨论。

A standard single-mode silica optical fiber is selected as an ideal cylindrical substrate for the three-dimensional colloidal crystal coated with silica microspheres through isothermal heating evaporation induced self-assembly at certain temperature and liquid surface dropping velocities.The optical fiber is vertically inserted into the silica microspheres colloidal solution at the center of the vial,and three-dimensional nanostructures colloidal crystal film is fabricated by capillary force.The silica spheres used have an average diameter of 390 nm.It takes only 12 h for the sphere particles to completely form crystal film.The photonic crystal cylindrical annulus is characterized by scanning electron microscopy（SEM）.Scanning electron micrographs illustrate the and -oriented regions,and the two zones of regularly intercrossed pattern.Qualitative analysis and discussion are carried out for the the different alignment of crystal orientation of sililca micro-spheres and the cross pattern