高质量胶体晶体薄膜的快速制备及表征

通过控制温度和湿度，用垂直沉积法（vertical deposition method）快速制备出了可精确控制样品的厚度、在较大范围呈现好的有序性的密排结构的聚苯乙烯（PS）胶体晶体 薄膜.利用透射电子显微镜直观准确地确定了样品为面心（fcc）密排结构.通过控制样品干燥速度和加温处理，胶体颗粒排列更加有序,并且克服了胶体晶体干燥后易碎和在水等溶 剂中容易再分散等缺点，为胶体晶体实际应用创造了条件. 关键词： 胶体晶体薄膜 垂直沉积法 面心密排结构 再分散

Synthesis and optical properties of durable opal photonic crystals with high crystalline quality

Polystyrene (PS) colloidal crystal multilayers with high crystalline quality are fabricated quickly from aqueous colloidal solutions by the vertical deposition method at certain temperature and humidity. Optical properties, which are determined by the photonic band structure, are discussed by means of light transmission and reflection measurements. By scanning electron microscopy (SEM), the morphology of the samples is characterized and the ordered close package of the spherical colloids in planes parallel to the substrate surface is illustrated. Furthermore, face centered cubic (fcc) phase is proved by transmission ele ctron microscope (TEM). To avoid friability and redispersal, the colloidal c rystals multilayers are dried slowed and sintered at 105℃ for 6 hours to enlarg ement of the contact section between nearest neighbor PS spheres. Experiments h ave proved the efficiency and practicability of the method.