论文部分内容阅读
通过分层镀膜的方式制备Ag和SiO2的分层结构,经过快速热退火后,Ag颗粒扩散到复合薄膜的表面附近.通过改变Ag颗粒扩散的距离(SiO2的膜厚),可很好地控制Ag颗粒在复合薄膜表面附近的大小,浓度和形貌,进而对共振吸收特性产生影响.在实验中,根据Ag颗粒扩散的长度来调节退火的时间.发现经过足够长的时间(17.5min)后,Ag颗粒会形成平行于衬底的平面团簇.由于Ag原子在平面团簇之间容易扩散,使得Ag颗粒的粒径平均值变小并趋于某一特定的半径,且粒径分布范围变小,导致吸收谱发生蓝移,吸收带变窄,且强度增加.
The layered structure of Ag and SiO2 was prepared by layered coating, and after rapid thermal annealing, the Ag particles diffused to the vicinity of the surface of the composite film. By changing the diffusion distance of Ag particles (the film thickness of SiO2), the Ag The size, concentration and morphology of Ag particles in the vicinity of the surface of the composite film have an impact on the resonance absorption characteristics.In the experiment, the annealing time was adjusted according to the diffusion length of Ag particles, and it was found that after a sufficient period of time (17.5 minutes) , The Ag particles will form planar clusters parallel to the substrate.As the Ag atoms are easily diffused between the planar clusters, the average particle size of Ag particles becomes smaller and tends to a certain radius, and the particle size distribution range Becomes smaller, resulting in a blue shift of the absorption spectrum, the absorption band becomes narrower, and the intensity increases.