| As the time for big data is coming,data is transforming from a simple object to be processed into basic resources to understand the existing world and to support subsequent development. As a result, the demand for its storage density and capacity exerts explosive growth. Traditional optical storage has a unique advantage to meet the needs of long-term, safe and efficient in the era of big data, but it is hard to get rid of the bottleneck of optical diffraction limit. At present, the storage life of common optical disc is no more than one hundred years, as the amount of data, so that the CD manufacturing will cause enormous waste of resources.This paper puts forward a new type of nanoparticle assembly structure of the storage medium, where there is no optical diffraction limit. It is supported by porous alumina film, and then gold nanorods coated with silicon oxide film disorderly dispersed in the hole of the supporting materials to form a kind of inorganic medium.because different wavelength and polarization orientation of laser pulse can selectively ablation gold nanorods, the storage medium increases the two dimentions of laser wavelength and polarization on the basis of the traditional three-dimentional storage space. Thereby it realize multi-dimensional storage of different data stored in the same area,that is to say, it greatly improves the storage capacity and makes important contributions to realize high density storage technology. Prepare gold nanorods which are in diameter of about 15 nm and length to diameter ratio of 3with cetyl trimethyl ammonium bromide(CTAB) as the surfactant through gold-seed method. Then the polyvinylpyrrolidone(PVP) substitutes CTAB as the surfactant and an about 30 nm thick layer of the mesoporous silica(Si O2) coat on the surface of gold nanorods. Afterwards, through the secondary anodic oxidation method, prepared porous aluminum oxide(AAO) template with the depth and aperture of 300 nm. Finally the gold nanorods coated with silica(GNRs@Si O2)disorderly dispersed in AAO membrane aperture by electrophoretic deposition to get the storage medium. In this paper, the gold nanorods and GNRs@Si O2 respectively be observed through transmission electron microscopy(TEM) and scanning electron microscope(SEM), which verify its morphology and size are within the expectedrange. Then measuring the absorption spectrum of gold nanorods before and after coated Si O2 by ultraviolet-visible spectrophotometer, which illustrates that absorption occurs only little redshift. Fortunately, it almost don't have a negative impact on record and read of laser signal. Further, test the electrical characteristics of the gold nanorods and ing GNRs@Si O2 respectively by Zeta potentiometer which made it possible to its use of subsequent electrophoresis operation. Finally let gold nanorods disorderly fill as much as possible to the AAO hole by changing the electrophoresis conditions.Research shows: The disc adopts the pure inorganic material preparation, so its thermodynamic performance is stable and the service life of the plate is expected to reach one thousand, which can greatly reduce the maintenance cost of CD data storage and be of great significance to the development of information society and knowledge economy. |
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