| The CD storage technology characterized by high density and long life is an important component of information science and technology. High-density CD has become a key equipment in multimedia era of data storage. Storage medium has always been a technology bottlenecks of high-density optical storage, therefore seeking new high-performance optical recording medium and the development of new high-quality recording membrane preparation methods, has become the main task. Compared with inorganic materials , organic materials have the advantages of high sensitivity, easy processing and facilitate the restructuring, in spite of organic materials for optical storage has a history of 30 years, only a few are practical.Organic materials of optical storage media wide-used include Azo dyes, Cyanine dyes, Phthalo-cyanine dyes in current. Compared to other types of dyes, the Azo dyes has good stability, easy solution, easy preparation, and other characteristics. More important is the maximum absorption peak can be moved to the short-wave zone (blue-green light and blue light) through structural modification, which is expected to be as higher-density optical information storage materials.Started with the maximum absorption peak can be moved to the shortwave area through structural modification, using the method of nano-particles and organic molecules co-doping, we related the thinking of material design, explored the preparation of materials, process and mechanism, and researched material properties in UV irradiation. The main work and conclusions are as follows:1. Using colloid chemical method, sodium borohydride as the reducing agent and 1wt% polyvinyl alcohol (PVA) as stabilizer, the brown silver colloid (BSC) was prepared. The morphologies of nanoparticles were observed by transmission electronic microscope (TEM), and the optical absorption spectra of BSC were measured by ultraviolet-visible spectrometer. The experimental results show that the size distribution and maximum absorption wavelength of silver particles are 10～17 run, 397 nm, respectively. Compared with the results other reports, it was found that the spherical silver nanoparticles with narrower size distribution, more uniform dispersion in space, no aggregation between particles and better optical absorption properties.2. The solvent effect experiments of Azo dye methyl orange (MO) and ethyl orange (EO) have been done, where MO and EO are the organic molecules with the properties of optical storage. It was found that the red-shifts of absorption of the Azo dyes appear with increasing of the polarity of solvents, and the absorption peak of MO is near to the short wavelength region compared with that of EO in the same solvent by the experiments with different polar solvents (ethanol, methanol, water).3. The two technical processes and procedures for realizing the co-doping of metal particles and dye molecules are proposed. The structural models of materials (co-mixing structure and coating structure) were offered. The formation mechanisms of two different structures of materials were discussed in detail. By spin-coating technology, two kinds of co-doped MNPADC composite films (co-mixing MBP film and coating MBP film with supra molecular structure) were prepared. Structure model for coating based on supra molecular structures were given at last.4. The design of measurement and experimental device of samples were provided; UV-Vis spectra and FT-IR spectra of samples were measured, UV-Vis spectra of different component and different structure were analyzed and compared; FT-IR spectra of different component and different structure were analyzed and compared too; UV photolysis properties of co-doping functional composite film was emphasized.It was found by experiment that UV irradiation is different on methyl orange in different structure and different components film. Irradiation in MP film without silver nanoparticles is the most obvious; Irradiation in component film with silver nanoparticles is weak. The role of the nano-effect of silver nanoparticles maybe causes the results, silver nanoparticles is disincentive to UV irradiation on methyl orange; The distinction is more obvious in MBP film with coating structure. We supposed that the formation of supra-molecular structure is inseparable from the reasons for that; FT-IR spectra of the samples were analyzed. The characteristics vibration wave number of groups were identified, infrared spectra of the thin film de-gradated in different light intensity and different time were compared. The role of UV irradiation is proportional to light intensity and the time. |
PDF Full Text Request