CN112233702B - Preparation method and application of hydrogel-modified high-stability carbon-based holographic optical disk - Google Patents
Preparation method and application of hydrogel-modified high-stability carbon-based holographic optical disk Download PDFInfo
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- CN112233702B CN112233702B CN202011153886.5A CN202011153886A CN112233702B CN 112233702 B CN112233702 B CN 112233702B CN 202011153886 A CN202011153886 A CN 202011153886A CN 112233702 B CN112233702 B CN 112233702B
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
- G11B7/0065—Recording, reproducing or erasing by using optical interference patterns, e.g. holograms
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
- G11B7/083—Disposition or mounting of heads or light sources relatively to record carriers relative to record carriers storing information in the form of optical interference patterns, e.g. holograms
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
- G11B7/1353—Diffractive elements, e.g. holograms or gratings
Abstract
A hydrogel modified high-stability carbon-based holographic optical disk preparation method and application relate to the technical field of information storage, and solve the problem that a preparation method of a storage medium with high information storage stability and high diffraction efficiency is needed, and the preparation method comprises the steps of preparing a porous titanium dioxide film on an optical disk type glass substrate; soaking the porous titanium dioxide film in a carbon quantum dot solution to load carbon quantum dots on the porous titanium dioxide film to obtain a carbon quantum dot/titanium dioxide composite film; soaking in silver nitrate solution and preparing a silver/carbon quantum dot/titanium dioxide composite film by adopting ultraviolet lamp irradiation; and attaching a layer of hydrogel by adopting a pulling and dipping method. The preparation method is convenient and reliable, has low cost and is suitable for commercial mass production, and the prepared optical disc has the performance advantages of high stability, high efficiency and high uniformity of information storage, so that holographic optical storage is possible in the future data storage field, and the method can be well applied to the holographic data storage field.
Description
Technical Field
The invention relates to the field of big data era information storage, in particular to the technical field of holographic optical storage, and specifically relates to a preparation method and application of a hydrogel-modified high-stability carbon-based holographic optical disk.
Background
With the advent of the big data age, the position of data has become more prominent, and the united states refers to data as "future new oil". In such a huge amount of data, 80% of the data is cold data that is not frequently used by people, and thus storage of a large amount of cold data is particularly important. Conventional data storage methods including magnetic storage and optical disc storage are facing many challenges such as power consumption challenge, security challenge, and storage capacity challenge, which makes holographic optical storage meet new development opportunities. Holographic optical storage is used for storing information by storing coherent optical fields of object light and reference light in a photosensitive medium, and a special storage mode has remarkable advantages in the aspects of high density, low energy consumption, long-term safety and the like. How to commercialize holographic optical storage further, that is, how to make a holographic optical disc more practical, still faces some problems, such as convenience and maturity of holographic optical disc preparation conditions, lower cost, stability of optical disc, etc. The key point for solving the problems lies in exploring a photosensitive medium which has high stability, can be prepared in a large area and has higher cost performance.
For a system which is researched more before and combines metal silver nanoparticles and titanium dioxide semiconductor oxide, when the silver nanoparticles and the titanium dioxide are compounded, plasmon resonance absorption of the silver nanoparticles is widened, and stronger absorption is realized from a visible region to a near infrared region, so that Ag/TiO2The composite film may be responsive to light at multiple wavelengths. In addition, due to the adjustability of the morphology and the size of the silver nanoparticles in the growth process, the silver nanoparticles have higher sensitivity to light in different polarization states. Therefore, wavelength multiplexing and polarization multiplexing are well realized in previous researches, and storage density is further improved, but in the system, reading light is destructive to writing of information due to too wide absorption spectrum, and information storage stability is poor.
The carbon quantum dot has the characteristics of easy synthesis, low manufacturing cost, no toxicity, high biocompatibility, high stability and the like, excellent optical properties of up-conversion photoluminescence and photoinduced electron/charge transfer and plasma surface enhanced electrical properties, and the advantages enable the carbon quantum dot to be applied in a plurality of fields. In recent research, the carbon quantum dot/titanium dioxide composite film not only has bidirectional photochromic characteristics, but also can improve the stability of information storage, but the current carbon quantum dot/titanium dioxide composite film also has the problems of low information storage speed and low diffraction efficiency. Therefore, a method for preparing a storage medium with low preparation cost is urgently needed to prepare a storage medium with high information storage stability and high diffraction efficiency, so that the holographic optical disc storage is more practical.
Disclosure of Invention
In order to solve the problems, the invention provides a preparation method and application of a hydrogel-modified high-stability carbon-based holographic optical disk.
The technical scheme adopted by the invention for solving the technical problem is as follows:
a preparation method of hydrogel-modified high-stability carbon-based holographic optical disk comprises the following steps:
s1, preparing a titanium dioxide film on the surface of the optical disk type glass substrate by adopting a screen printing technology, curing the titanium dioxide film, and then carrying out high-temperature annealing treatment to obtain a porous titanium dioxide film;
s2, soaking the porous titanium dioxide film in the carbon quantum dot solution to enable the porous titanium dioxide film to load carbon quantum dots, and obtaining a carbon quantum dot/titanium dioxide composite film;
s3, soaking the carbon quantum dot/titanium dioxide composite film in a silver nitrate solution, irradiating the carbon quantum dot/titanium dioxide composite film by using an ultraviolet lamp, and depositing silver nano particles on the carbon quantum dot/titanium dioxide composite film to obtain a silver/carbon quantum dot/titanium dioxide composite film;
and S4, attaching a layer of hydrogel on the surface of the silver/carbon quantum dot/titanium dioxide composite film by adopting a pulling and dipping method, and finishing the preparation of the hydrogel-modified high-stability carbon-based holographic optical disk.
A hydrogel-modified high-stability carbon-based holographic optical disk prepared by the preparation method of the hydrogel-modified high-stability carbon-based holographic optical disk.
Hydrogel-modified high-stability carbon-based holographic optical disk, which is applied to holographic optical storage.
The invention has the beneficial effects that:
the preparation method of the hydrogel-modified high-stability carbon-based holographic optical disk is convenient and reliable, is suitable for commercial mass production, and is low in preparation cost and free of environmental pollution. The prepared carbon-based holographic optical disk has the performance advantages of high stability, high efficiency and high uniformity of information storage, so that holographic optical storage is possible in the future data storage field, and the method can be well applied to the holographic data storage field.
Drawings
FIG. 1 is a flow chart of a method for preparing a hydrogel-modified high-stability carbon-based holographic optical disc according to the present invention.
Fig. 2 is a scanning electron microscope image of the surface of the porous titanium dioxide thin film of the present invention.
FIG. 3 is a scanning electron microscope image of a cross section of a porous titanium dioxide film of the present invention.
FIG. 4 shows pure TiO2Thin films, CQDs/TiO2Composite film, Ag/CQDs/TiO2Absorption spectrum of the composite film.
FIG. 5 is Ag/CQDs/TiO2Differential absorption spectrum of the composite film under the excitation of 405nm laser.
FIG. 6 shows Ag/TiO2Composite film and Ag/CQDs/TiO2Holographic grating growth dynamics curve of the composite film under 405nm wavelength laser writing and 671nm reading light.
FIG. 7 is CQDs/TiO2Composite film and Ag/CQDs/TiO2Holographic grating growth dynamics curve of the composite film under 405nm wavelength laser writing and 671nm reading light.
FIG. 8 shows Ag/TiO2Composite film and Ag/CQDs/TiO2Holographic grating growth dynamics curve of the composite film under the laser writing of 405nm wavelength and the readout of 721nm wavelength.
FIG. 9 is CQDs/TiO2Composite film and Ag/CQDs/TiO2Holographic grating growth dynamics curve of the composite film under the laser writing of 405nm wavelength and the readout of 721nm wavelength.
FIG. 10 shows Ag/CQDs/TiO2Composite film and Ag/TiO2Differential bar curve of sample uniformity of composite film under same test condition
FIG. 11 is a diagram of Ag/CQDs/TiO2Composite film and CQDs/TiO2Differential bar curve of sample uniformity for composite films under the same test conditions.
FIG. 12 is Ag/CQDs/TiO2The holographic grating growth dynamics curve of the composite film under 671nm wavelength reading and 405nm wavelength laser writing under different conditions of no hydrogel modification.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
A method for preparing hydrogel-modified high-stability carbon-based holographic optical disk, as shown in FIG. 1, comprises the following steps:
s1, preparing a titanium dioxide film on the surface of the optical disk type glass substrate by adopting a screen printing technology, curing the titanium dioxide film, and carrying out high-temperature annealing treatment on the cured titanium dioxide film to obtain the porous titanium dioxide film.
The specific process of S1 is as follows: taking a disc-shaped glass substrate which is circular, has the size of 80mm in outer diameter and 21mm in inner diameter, preparing commercial titanium dioxide slurry for purchase, wiping a template and a scraper of a screen printer by alcohol cotton, drying the template and the scraper by using an air gun, placing the disc-shaped glass substrate on the screen printer, coating the titanium dioxide slurry on the foremost end of the template, starting the screen printer for blade coating, and preparing a layer of titanium dioxide film on the front surface of the disc-shaped glass substrate. The titanium dioxide film prepared by the automatic screen printer is uniform and has good film forming property. Placing the optical disk type glass substrate with the titanium dioxide film on a hot plate, heating the titanium dioxide film by the hot plate to solidify the titanium dioxide film, specifically, maintaining the temperature at 130 ℃ for 20 minutes, taking down the optical disk type glass substrate when the temperature of the hot plate is reduced to room temperature, placing the optical disk type glass substrate into a muffle furnace to carry out high-temperature annealing treatment, and annealing at 500 ℃ for 1 hour to obtain the porous titanium dioxide film. The porous titanium dioxide film comprises a disc-shaped glass substrate and a titanium dioxide thin layer positioned on the disc-shaped glass substrate, wherein the titanium dioxide thin layer is a porous titanium dioxide thin layer.
S2, soaking the porous titanium dioxide film in the carbon quantum dot solution to enable the porous titanium dioxide film to load the carbon quantum dots, and obtaining the carbon quantum dot/titanium dioxide composite film.
The specific process of S2 is as follows: preparing a carbon quantum dot solution, weighing equal mass of urea and p-phenylenediamine by using an electronic balance, mixing according to a weight ratio of 1:1, wherein 0.2g of each of the equal mass of urea and the equal mass of the p-phenylenediamine is respectively weighed, weighing 50ml of pure water (or ultrapure water) by using a measuring cylinder, sequentially putting the urea, the p-phenylenediamine and the pure water into a high-temperature high-pressure reaction kettle, sealing the high-temperature high-pressure reaction kettle, carrying out ultrasonic treatment for 20min, then putting the reaction kettle into an oven for heating, maintaining the temperature of the oven at 180 ℃ for 8 hours, and taking out the solution after the reaction kettle is completely cooled to room temperature, thus obtaining the carbon quantum dot solution. Finding out the position with the best levelness (the most levelness) on a laboratory bench by using a level meter, placing a culture dish at the position, then placing a porous titanium dioxide film, finally pouring a carbon quantum dot solution until the titanium dioxide film is completely immersed in the porous titanium dioxide film, sealing the culture dish, soaking at room temperature for 2 hours, and taking out the culture dish to obtain the porous titanium dioxide film loaded with the carbon quantum dots, namely a carbon quantum dot/titanium dioxide composite film (CQDs/TiO/CQOS)2A composite film). And taking the carbon quantum dot/titanium dioxide composite film out of the carbon quantum dot solution, washing the carbon quantum dot/titanium dioxide composite film with purified water, and blowing the carbon quantum dot/titanium dioxide composite film to dry by using an air gun. CQDs/TiO2The composite film exhibited a light pink color.
S3, soaking the carbon quantum dot/titanium dioxide composite film in a silver nitrate solution, irradiating the carbon quantum dot/titanium dioxide composite film by using ultraviolet lamp light, and depositing silver nano particles on the carbon quantum dot/titanium dioxide composite film to obtain the silver/carbon quantum dot/titanium dioxide composite film.
The specific process of S3 is as follows: 1.7g of silver nitrate solid particles are weighed and dissolved in 98ml of pure waterStirring for 30min by using a magnetic stirrer, adding 2ml of ethanol, and continuing stirring for 20min to obtain a silver nitrate solution. Horizontally placing the carbon quantum dot/titanium dioxide film into a culture dish, pouring a silver nitrate solution into the culture dish to completely immerse the carbon quantum dot/titanium dioxide film, and irradiating the silver nitrate solution and the carbon quantum dot/titanium dioxide film immersed in the silver nitrate solution by using an ultraviolet lamp tube, wherein the ultraviolet power density is 1mw/cm2After the ultraviolet light is radiated for 15 minutes, silver nano particles are generated and deposited in the carbon quantum dot/titanium dioxide composite film, the silver nano particles are positioned in the multiple holes of the carbon quantum dot/titanium dioxide composite film and also positioned on the surface of the carbon quantum dot/titanium dioxide composite film, and the silver/carbon quantum dot/titanium dioxide composite film is obtained. Under the excitation of ultraviolet light, the titanium dioxide and the carbon quantum dots jointly release electrons to lead Ag in silver nitrate solution+Reducing the silver into silver nano particles (AgNPs), changing the corresponding film into dark brown, and reducing the silver/carbon quantum dots/titanium dioxide composite film (Ag/CQDs/TiO) after the ultraviolet light reduces the silver2Composite film), the silver/carbon quantum dot/titanium dioxide composite film is taken out from the silver nitrate solution, the silver/carbon quantum dot/titanium dioxide composite film is washed by pure water, and the washed silver/carbon quantum dot/titanium dioxide composite film is dried by an air gun.
And S4, attaching a layer of hydrogel on the surface of the silver/carbon quantum dot/titanium dioxide composite film by adopting a pulling and dipping method, and finishing the preparation of the hydrogel-modified high-stability carbon-based holographic optical disk.
The specific process of S4 is as follows: 0.5g of agarose particles and 50ml of pure water are weighed and sequentially put into a 100ml beaker, and stirred for 30min at a constant temperature of 190 ℃ by using a temperature-adjustable magnetic stirrer until the mixed solution is boiled and is in a clear solution state. Fixing a disc-shaped glass substrate of a silver/carbon quantum dot/titanium dioxide composite film on a film lifting machine through a sucker, sucking the sucker on the reverse side (surface without titanium dioxide) of the disc-shaped glass substrate, enabling the front side of the disc-shaped glass substrate to be horizontal downwards, placing a culture dish filled with a hydrogel solution with the temperature of 80 ℃ below the disc-shaped glass substrate, preparing a hydrogel layer through a lifting and dipping method, enabling the speed of lifting and descending the disc-shaped glass substrate to be 4.5mm/s in the lifting and dipping process, dipping time in the hydrogel solution to be 4s, enabling the surface of the silver/carbon quantum dot/titanium dioxide composite film to be provided with a layer of hydrogel after the lifting and dipping are completed, enabling the disc-shaped glass substrate to stand and hang for 5 minutes, then taking off the disc-shaped glass substrate, irradiating the hydrogel layer with an infrared lamp for 5 minutes at room temperature, and curing the hydrogel layer to obtain the hydrogel-modified high-stability carbon-based holographic optical disk.
Fig. 2 and 3 are scanning electron microscope images of the porous titanium dioxide film, and it can be observed from fig. 2 that the pore size distribution of the upper surface of the porous titanium dioxide film is wide, the pore size distribution is from 10nm to 100nm, and the thickness of the titanium dioxide thin layer of the porous titanium dioxide film is 2.467 μm, so that the porous titanium dioxide thin layer with the thickness of about 2.4 μm is beneficial to anchoring Carbon Quantum Dots (CQDs) in the inner part and the surface, and simultaneously provides more alternating current and reaction sites for the carbon quantum dots and silver nano particles (Ag _ NPs), thereby promoting the charge transfer.
Taking pure titanium dioxide (TiO)2) Film, carbon quantum dots/titanium dioxide (CQDs/TiO)2) Composite film and silver/carbon quantum dots/titanium dioxide (Ag/CQDs/TiO)2) The absorption spectra of the composite film were measured by UV1900PC UV-visible spectrophotometer, and the results are shown in FIGS. 4 and 5, in which FIG. 4 is pure TiO2Thin films, CQDs/TiO2Composite film, Ag/CQDs/TiO2The absorption curve of the composite film is shown in FIG. 5 as Ag/CQDs/TiO2Differential absorption spectrum of the composite film under the excitation of 405nm laser. As can be seen from the absorption spectrum of FIG. 4, pure TiO2The film has almost no absorption in a visible light wave band, only has band edge absorption around 380nm in an ultraviolet region, and effectively improves the absorbance of the film in the visible light wave band of 400nm-650nm after loading carbon quantum dots and silver nano particles. In FIG. 5, there are 9 differential absorption spectrum curves corresponding to the differential absorption spectrum curves of the film at 10s, 30s, 60s, 120s, 3min, 5min, 7min, 10min and 20min, respectively, and Ag/CQDs/TiO can be observed2The absorbance of the composite film is reduced along with the increase of the optical excitation time under the excitation of 405nm (power of 3mw) laser, and the differential absorption lightThe spectra show spectral hole burning at 400 nm. The process is due to Ag/CQDs/TiO under 405nm laser irradiation2The silver nano particles in the composite film generate surface plasmon resonance effect to generate electron transfer, and Ag NPs are dissolved and converted into Ag+And further forming a spectrum hole burning.
For Ag/TiO2Composite film, CQDs/TiO2Composite film, Ag/CQDs/TiO2The composite films were subjected to information storage stability tests, such as the holographic grating kinetic growth curves of fig. 6-9. The test method comprises the following steps: the laser with 405nn wavelength is used as write-in light, and is divided into two coherent reference lights through a half-reflecting half-transmitting mirror for writing in the holographic grating, the red light with 671nm or 721nm is used as read-out light, the write-in light beam and the read-out light beam irradiate the same point on the film at the same time, and then the first-order diffraction signal of the read-out light is monitored in real time through a photoelectric detector, so that the grating growth curve of holographic dynamics can be obtained. First, when a 405nm laser beam is used as writing light and a 671nm laser beam is used as reading light, Ag/CQDs/TiO in the information writing process can be seen from FIG. 62The diffraction efficiency of the composite film is obviously higher than that of Ag/TiO2The film is compounded, and the grating growth process is stable and continuous. At 1500s, the 405nm writing light is turned off, only the 671nm red light is allowed to continue to detect the diffraction signal of the grating, and Ag/TiO is observed2The diffraction efficiency of the composite film decays exponentially in e, and the following fitting equation of the first-order diffraction efficiency eta and the time (1500s-3000s) is used for fitting:
η＝η0×exp[-(t-t0)/τ]
wherein t is0＝1500s，η0Is t0At a diffraction efficiency of 1500s, τ is the time decay factor, with smaller τ representing faster curve decay. In FIG. 6, Ag/CQDs/TiO2Tau of the composite film is 1609.01s, and Ag/TiO2The composite film has τ of 613s, so that Ag/CQDs/TiO can be seen2The stability of the composite film information storage is obviously higher than that of Ag/TiO2Composite film due to Ag/TiO2The composite film also has relatively high absorbance at a long wavelength, and thus a readout light at 671nm has a large damage to an information writing process. While FIG. 7 shows CQ under the same test conditionsDs/TiO2The curve of the film did not decrease after the writing light was turned off, and it was thus found that the introduction of carbon quantum dots could indeed improve the stability of information storage. Furthermore, we also performed the same test with 721nm red as the readout light, as shown in FIGS. 8 and 9, when Ag/TiO is used2The curve of the composite film is still slightly attenuated after the writing light is turned off, and the Ag/CQDs/TiO2The diffraction efficiency of the composite film is still higher than that of Ag/TiO2The film is laminated and the curve does not decay nor does it grow after the writing light is turned off. CQDs/TiO with similar 721nm red light as the read light2The thin film information storage is still stable.
For the traditional silver/titanium dioxide system, under the irradiation of visible light, the silver nano particles release electrons due to surface plasmon resonance and transfer to titanium dioxide, and the silver nano particles are dissolved. However, titanium dioxide also generates electrons under the irradiation of short-wave writing light of 405nm, and the electrons can flow back to silver nanoparticles, so that the silver nanoparticles are secondarily reduced and restored, and the stability of the information writing process and the information storage process is influenced by the cyclic photochemical process. The problem can be well solved by introducing the carbon quantum dots, electrons can be provided as a reducing agent by the carbon quantum dots, and the electrons can be received and stored, and most of the electrons are received by the carbon quantum dots adsorbed on the surfaces of the carbon quantum dots in the titanium dioxide electron reflux process, so that secondary reduction of silver nanoparticles is prevented, and the stability of information storage is further protected.
FIG. 10 is a graph showing the results for Ag/CQDs/TiO2Composite film and Ag/TiO2FIG. 11 is a graph showing the results of the uniformity test of the composite film, and is a graph of Ag/CQDs/TiO2Composite film and CQDs/TiO2The result graph of the uniformity test of the composite film is shown, and the uniformity test method comprises the following steps: using light with 405nm wavelength as writing light, using red light with 671nm wavelength as reading light, testing 9 points on the same film one by one, comparing 9 kinetic grating growth curves, processing data to calculate corresponding average value and error value, the error value is represented by error bar, the longer the error bar is, the larger the error value is, in this placeThe larger the difference of the kinetic curves is, the larger the error of different points of the same film is, and the uniformity of the film is poor. We performed 6 error bars on a kinetic curve representing sample uniformity, as shown in FIGS. 10 and 11, where Ag/CQDs/TiO can be seen2The 6 error bars on the dynamic curve of the composite film are obviously shorter and uniform in length, which shows that the film has better uniformity; and Ag/TiO2The length of an error bar on a composite film dynamics curve is relatively longest, and the larger the error is along with the increase of information recording time, the worse film uniformity is indicated; CQDs/TiO alike2The error of the composite film was small before recording for a short time of 400s, however, the error became larger and larger as the time for recording information increased, and thus it can be seen that Ag/CQDs/TiO was prepared2The composite film has high stability, high efficiency and high uniformity.
In summary, Ag/CQDs/TiO2Compared with Ag/TiO composite film2Composite film and CQDs/TiO2The composite film has the advantages of high diffraction efficiency and good information storage stability. In addition, the hydrogel is attached to Ag/CQDs/TiO as a functional layer2The surface of the composite film further improves the performance of the optical disk when being coated on Ag/CQDs/TiO2After the composite film is attached with a layer of hydrogel (Ag/CQDs/TiO)2(hydrogel)), laser writing at 405nm, and red light reading at 671nm, as shown in FIG. 12, Ag/CQDs/TiO2The diffraction efficiency of the composite film is enhanced and also remains stable after the writing light is turned off, and τ is 2011.23 s. Introduction of hydrogel enables Ag/CQDs/TiO2The reason why both the diffraction efficiency and the stability of the composite film are improved is that the hydrogel, which generally exhibits excellent biocompatibility, has high water retention property and photosensitivity, is coated as a functional layer on Ag/CQDs/TiO2The surface of the composite film can provide a more favorable humidity generating environment for the redox reaction of the nano particles; second, attachment of the hydrogel to Ag/CQDs/TiO2The Ag nano particles in the composite film are distributed more stably, the problem that the storage stability is influenced due to the self-migration of the Ag nano particles in the information storage process is solved, and high-efficiency and high-stability storage is realized.
The preparation method of the hydrogel-modified high-stability carbon-based holographic optical disk is convenient, reliable and low in cost, and the holographic optical disk prepared by the method can be commercially produced by the aid of an automatic screen printer; secondly, the carbon quantum in the carbon-based holographic optical disk prepared by the method not only can be used as an electron donor to release electrons together with titanium dioxide when the silver nano particles are reduced by ultraviolet light, but also can be used for Ag+The Ag NPs are reduced into Ag NPs (silver nanoparticles) and can also be used as electron acceptors to receive electrons released by the Ag NPs when the surface plasmon resonance effect is generated due to optical excitation in the information writing process.
The pure titanium dioxide film has almost no absorption in a visible light wave band, and has an absorption band only in an ultraviolet region, but the introduction of the carbon quantum dots and the silver effectively enhances the absorption of the titanium dioxide in the visible light wave band, and can effectively inhibit the separation of photo-generated electron hole pairs, so that the titanium dioxide film sensitized by the carbon quantum dots and the silver together has the advantages of higher information storage efficiency, better information storage stability and better film uniformity compared with silver/titanium dioxide and carbon quantum dots/titanium dioxide films.
And then, under the action of hydrogel, Ag nano particles in the silver/carbon quantum dot/titanium dioxide composite film are distributed more stably, the problem that storage stability is influenced due to self migration of the Ag nano particles in the information storage process is solved, and high-efficiency and high-stability storage is realized.
The feasibility of the preparation method of the hydrogel-modified high-stability carbon-based holographic optical disk and the performance advantages of the optical disk in the aspects of high stability, high efficiency, high uniformity and the like further develop the practicability of the holographic optical disk, and the carbon-based holographic optical disk can be applied to the field of holographic data storage, thereby promoting the commercial application of the holographic optical storage technology in the field of future information storage.
Claims (10)
1. A preparation method of hydrogel-modified high-stability carbon-based holographic optical disk is characterized by comprising the following steps:
s1, preparing a titanium dioxide film on the surface of the optical disk type glass substrate by adopting a screen printing technology, curing the titanium dioxide film, and then carrying out high-temperature annealing treatment to obtain a porous titanium dioxide film;
s2, soaking the porous titanium dioxide film in the carbon quantum dot solution to enable the porous titanium dioxide film to load carbon quantum dots, and obtaining a carbon quantum dot/titanium dioxide composite film;
s3, soaking the carbon quantum dot/titanium dioxide composite film in a silver nitrate solution, irradiating the carbon quantum dot/titanium dioxide composite film by using an ultraviolet lamp, and depositing silver nano particles on the carbon quantum dot/titanium dioxide composite film to obtain a silver/carbon quantum dot/titanium dioxide composite film;
and S4, attaching a layer of hydrogel on the surface of the silver/carbon quantum dot/titanium dioxide composite film by adopting a pulling and dipping method, and finishing the preparation of the hydrogel-modified high-stability carbon-based holographic optical disk.
2. The method for preparing hydrogel-modified highly stable carbon-based holographic optical disc as claimed in claim 1, wherein the specific process of S1 is as follows: preparing a titanium dioxide film on the surface of the optical disk type glass substrate by adopting a screen printing technology, placing the titanium dioxide film on a hot plate, heating to solidify the titanium dioxide film, and carrying out high-temperature annealing treatment on the solidified titanium dioxide film to obtain the porous titanium dioxide film.
3. The method for preparing a hydrogel-modified highly stable carbon-based holographic disk as claimed in claim 1, wherein the high temperature annealing treatment is performed at 500 ℃ for 1 hour.
4. The method for preparing hydrogel-modified highly stable carbon-based holographic optical disk according to claim 1, wherein the specific process of preparing the titanium dioxide thin film on the surface of the optical disk type glass substrate by using the screen printing technology comprises: coating the titanium dioxide slurry on a template of a screen printer, and blade-coating the optical disk type glass substrate by the screen printer to obtain the titanium dioxide film.
5. The method for preparing hydrogel-modified highly stable carbon-based holographic optical disc as claimed in claim 1, wherein the specific process of S2 is as follows: weighing urea and p-phenylenediamine with equal mass, putting pure water, urea and p-phenylenediamine into a reaction kettle, carrying out ultrasonic treatment for 20min, then putting the reaction kettle into an oven, heating the reaction kettle for 8h at 180 ℃, and cooling the reaction kettle to room temperature to obtain a carbon quantum dot solution; immersing the porous titanium dioxide film in the carbon quantum dot solution for 2 hours at room temperature to obtain a carbon quantum dot/titanium dioxide composite film, taking out the carbon quantum dot/titanium dioxide composite film from the carbon quantum dot solution, washing with purified water, and then blowing the carbon quantum dot/titanium dioxide composite film to dry by using an air gun.
6. The method for preparing hydrogel-modified highly stable carbon-based holographic optical disc as claimed in claim 1, wherein the specific process of S3 is as follows: weighing silver nitrate solid particles, dissolving the silver nitrate solid particles in pure water, adding absolute ethyl alcohol after uniformly stirring, and continuously stirring until uniform to obtain a silver nitrate solution; immersing the carbon quantum dot/titanium dioxide composite film in a silver nitrate solution, irradiating the silver nitrate solution and the carbon quantum dot/titanium dioxide film immersed in the silver nitrate solution by using an ultraviolet lamp until silver nano particles are generated and deposited in the carbon quantum dot/titanium dioxide composite film to obtain the silver/carbon quantum dot/titanium dioxide composite film, taking the silver/carbon quantum dot/titanium dioxide composite film out of the silver nitrate solution, washing the silver/carbon quantum dot/titanium dioxide composite film by using pure water, and blowing the silver/carbon quantum dot/titanium dioxide composite film by using an air gun.
7. The method for preparing hydrogel-modified highly stable carbon-based holographic optical disc as claimed in claim 1, wherein the specific process of S4 is as follows: dissolving agarose particles in pure water, and stirring by using a temperature-adjustable magnetic stirrer until the solution is boiled and clear, so that the preparation of the hydrogel solution is finished; preparing a hydrogel layer on the silver/carbon quantum dot/titanium dioxide composite film by taking a hydrogel solution at the temperature of 80 ℃ and utilizing a pulling and dipping method, standing and suspending the optical disc type glass substrate with the hydrogel layer for 5 minutes, taking down the optical disc type glass substrate, irradiating the hydrogel layer by using an infrared lamp at room temperature to cure the hydrogel layer, and curing the hydrogel layer to obtain the hydrogel-modified high-stability carbon-based holographic optical disc.
8. The method for preparing a hydrogel-modified highly stable carbon-based holographic disk as claimed in claim 7, wherein the speed of the dip-lift process is 4.5mm/s, and the dip time of the silver/carbon quantum dot/titanium dioxide composite film in the hydrogel solution is 4 s.
9. The hydrogel-modified highly stable carbon-based holographic disk prepared by the method for preparing the hydrogel-modified highly stable carbon-based holographic disk according to any one of claims 1 to 8.
10. The hydrogel modified highly stable carbon-based holographic disk of claim 9, wherein the hydrogel modified highly stable carbon-based holographic disk is used in holographic optical storage.
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