【摘要】 通过制备过程中严格分离晶核的形成和生长两步骤,成功获取了直径一致的单分散ZnO胶体球,并通过控制晶核的数量来调节胶体球大小.利用扫描电子显微镜和X射线衍射仪对其进行了结构和成分表征.通过加热条件下的重力场自组装,把ZnO单分散胶体球的浓缩液滴到140℃下的各种不同的基底上,随着溶剂蒸发。胶体球自组装成光子晶体,最后测量了光子晶体的光透过率,胶体球直径为220、250 nm的光子晶体分别具有对应着中心波长为460、540 nm的光子带隙.更多还原

【Abstract】 Monodispersed ZnO spheres were produced by strictly isolating the formation and growth of crystal nuclear,and the sphere diameters were controlled by varying the amount of the crystal nuclear.Photonic crystals (PCs) were produced from ZnO spheres by using a kind of sedimentation self-assembly process.The concentrated reaction solution was dropped onto a substrate typically at 140℃,and as the solvent evaporated,the particles spontaneously assembled into periodic structures.By measuring the normal-incidence transmission spectra,the photonic band gap (PBG) of our periodic structures was observed,the PCs assembled by monodisperse ZnO spheres with diameters of 220 and 250 nm corresponded to the PBG with the center wavelengths of 460 and 540 nm,respectively.更多还原