纳米金属-偶氮染料共掺杂复合膜的制备与吸收蓝移现象

为了达到高密度存储, 关键而有效的方法是获得更短波长的光存储材料. 报道了具有纳米金属-偶氮染料包覆共掺杂结构复合材料的制备及光吸收蓝移现象. 实验发现, 在这种独特结构的复合膜中, 具有存储功能的偶氮染料甲基橙的最大吸收波长比其单独存在于复合膜中蓝移约23 nm, 复合膜的热稳定性提高. 用TEM, SPM, UV-vis, TGA对样品的物理特性进行了表征. 描述了包覆结构的模型, 分析了波长蓝移的机理. 研究结果表明, 具有这种结构的甲基橙有望成为与蓝紫光半导体激光器(GaN)匹配的新一代光存储材料.

Preparation and Blue-shift Phenomenon of Absorption of the Composite Film Codoped with Nanosized Metal and Azo-dye

High storage capacity is one of the main aims of optical storage technology. To realize high storage density, the key and efficient way is to obtain optical storage materials capable of recording information in high density by means of laser beam with short wavelength. In the present work, the preparation and blue-shift phenomenon of optical absorption of the composite materials coated-codoped with nanosized metal and azo-dye were reported. It was found that, due to the specific structure of the composite film, the absorption maximum of azo-dye methyl orange (MO) shifted about 23 nm towards shorter wavelength region and the heat stability of the composite film was improved compared with that of MO in polyvinyl alcohol film only. The samples were characterized by TEM, SPM, UV-vis and TGA. The structural model for the coating-codoping was described. The mechanism of blue-shift was discussed. These results indicate that, the composite film which absorbed in blue-violet region (400～450 nm), and was capable of matching the laser (GaN) beam, has potential as a new type of optical recording materials.