42 results about "Titanium dioxide thin film" patented technology

A preparation method of a high-quality titanium dioxide film with a controllable refractive index comprises the following steps that (1) a pulse laser light path is adjusted, and uniform scanning of a laser beam on the surface of a target material is achieved through a two-dimensional light beam scanning galvanometer; (2) preparing a titanium dioxide film: placing the substrate and the target material in a deposition cavity of vacuum deposition equipment, adjusting the distance between the target material and the substrate, setting the rotating speed of the target material and the heating temperature of the substrate, setting pulse laser parameters, bombarding the target material through collinear pulse string laser, and depositing generated plasma plume on the substrate to form the titanium dioxide film; and (3) annealing treatment of the titanium dioxide film: carrying out high-temperature oxygen introduction annealing treatment on the deposited titanium dioxide film. According to the method, the roughness of the titanium dioxide film is greatly improved in a collinear pulse string laser output mode, so that the high-quality titanium dioxide film with a smoother surface is obtained; the refractive index of the titanium dioxide film is flexibly regulated and controlled by changing the annealing temperature and time of high-temperature oxygen introduction.

The invention discloses a preparation method of a three-dimensional titanium dioxide micro-nano structure, which belongs to the technical field of micro-nano structure preparation, and comprises the following steps: evaporating a titanium dioxide film on a clean glass substrate; spin-coating positive photoresist on the titanium dioxide thin film; carrying out electron beam exposure on the photoresist, customizing a pattern, and carrying out developing and fixing treatment on the photoresist; evaporating a chromium (Cr) film on the developed and fixed sample; stripping the residual photoresist, and obtaining a patterned chromium hard mask on the titanium dioxide thin film; performing reactive ion beam etching on the titanium dioxide film; and removing the chromium hard mask from the etched sample to obtain the three-dimensional titanium dioxide nano-column array micro-nano structure. The titanium dioxide micro-nano structure prepared by the method has high degree of freedom, and regular regulation and control of nano structure unit parameters can be realized by changing reactive ion beam etching process parameters.

The invention relates to a titanium dioxide film as well as a preparation method and application thereof. The preparation method comprises the following steps: providing a substrate; an electron beam evaporation deposition method is adopted to enable the evaporation source material to form a deposition film on the surface of the substrate; wherein in the electron beam evaporation deposition method, reaction gas comprises oxygen, and the flow of the oxygen is 40 sccm to 80 sccm; carrying out annealing treatment on the deposited film to prepare a titanium dioxide film; titanium dioxide in the titanium dioxide film preferentially grows along a (004) crystal face; the evaporation source material comprises trititanium pentoxide. The electron beam evaporation deposition method is adopted, oxygen is introduced in the vacuum environment, trititanium pentoxide is converted into titanium dioxide, the titanium dioxide preferentially and directionally grows on the surface of the substrate along the crystal face (004), and preferential growth of the titanium dioxide material in the film is regulated and controlled.

The present invention provides a titanium oxide film with excellent anti-reflective properties and manufacturing efficiency, as well as a method for producing the same. [Solution] The titanium oxide film 1 contains a crystal in which a group of Ti2O3 diffraction spots appear in the electron diffraction pattern observed with a transmission electron microscope, and the refractive index when light with a wavelength of 550 nm is incident on it is greater than 2.50 and less than or equal to 2.80.

The present invention belongs to the technical field of capacitors and specifically relates to a photosensitive capacitor and a preparation method thereof. The photosensitive capacitor includes an upper plate, an upper electrode, a CuWO4-TiO2 dielectric layer, a lower electrode, a lower plate and a conductive wire, wherein the lower plate is arranged below the lower electrode, the upper plate is arranged above the upper electrode, the CuWO4-TiO2 dielectric layer is located between the upper electrode and the lower electrode, two conductive wires are provided, respectively connecting the upper electrode and the lower electrode, the CuWO4-TiO2 dielectric layer is obtained by sintering CuWO4 on both sides of a titanium dioxide film, and the present invention modifies and composites rutile titanium dioxide with CuWO4 as a dielectric layer, forms a stable crystal interface between CuWO4 and rutile titanium dioxide, and photons of visible light incident on the CuWO4 can excite holes generated by electrons, inducing the rutile titanium dioxide to generate small polarons, thereby maintaining a relatively high dielectric constant, so that the photosensitive capacitor can effectively utilize sunlight to regulate capacitance.

The application belongs to the technical field of solar cell preparation, and relates to a levodopa molecule modified titanium dioxide film, a preparation method thereof and application thereof in a perovskite solar cell. The levodopa molecule is used to introduce a molecular interface layer in the perovskite and the titanium dioxide, passivate defects in the perovskite and the titanium dioxide, improve photoelectric conversion efficiency, and strengthen working stability and storage stability. The levodopa molecule modified titanium dioxide film prepared by the application can also be applied in the preparation of a perovskite solar cell. The perovskite solar cell is made of a conductive substrate, an electron transport layer, a perovskite layer, a hole transport layer and a metal electrode layer arranged from bottom to top, wherein the electron transport layer is the levodopa molecule modified titanium dioxide film.

The present invention discloses a method for preparing a titanium dioxide hole blocking layer for a large-area perovskite solar cell. The method uses n-butyl titanate as a titanium source, and generates an N- and F-co-doped titanium dioxide film by a mixed hydrolysis method with nitric acid and 3-fluoropropanol. The titanium dioxide hole blocking layer surface is interface-modified using 3-mercaptopropionic acid or mercaptoacetic acid to form the titanium dioxide hole blocking layer of the perovskite solar cell. The method generates the N- and F-co-doped titanium dioxide film by a mixed hydrolysis method with nitric acid and 3-fluoropropanol, thereby ensuring that the large-area hole blocking layer film does not have holes and maintaining high photovoltaic performance of the solar cell.

The invention relates to the technical field of building energy-saving windows, in particular to a spectral reflection type energy-saving window with air gap response. The energy-saving window comprises a window frame and a plurality of layers of high-transmittance glass, and an air interlayer is arranged between every two adjacent layers of high-transmittance glass. In two pieces of glass forming the air interlayer in the high-transmittance glass, one piece of glass is sequentially provided with a deformation layer and a titanium dioxide film coating from inside to outside, and the other piece of glass is coated with a titanium dioxide film coating. A plurality of electromagnet sheets are arranged on the high-transmittance glass and used for controlling the thickness of the air interlayer. The air interlayer gap is changed by adjusting the power-on state of the electromagnet, the sunlight transmissivity is dynamically controlled according to the total reflection principle of light, and high-temperature heat insulation in summer and low-temperature heat preservation in winter are achieved. The dynamic temperature control energy-saving window is simple in structure and low in cost, the problems that an existing dynamic temperature control energy-saving window is complex in structure and high in cost are solved, and the winter and summer differential temperature control requirement is met.

The present invention provides a titanium dioxide thin film optical waveguide layer and a preparation method thereof, belonging to the technical field of optoelectronic conversion. In the present invention, titanium butoxide, triethanolamine, water and ethanol are used as raw materials to prepare a sol. By soaking and dipping, the sol is adhered to the structural surface of the substrate material, and the shape of the sol can be the same as that of the structural surface of the substrate material. Then, through pressure heat treatment, a chemical reaction occurs in the sol to generate titanium dioxide, thereby forming various heterogeneous structure titanium dioxide thin film optical waveguide layers required on the structural surface of the substrate material; the preparation process of this method is simple, the production efficiency is high, the manufacturing cost is low, which is conducive to large-scale production and meets the device application requirements. The results of the examples show that the thickness of the titanium dioxide thin film optical waveguide layer prepared by the preparation method provided by the present invention is 100-1200 nm, and the refractive index of the titanium dioxide thin film can be adjusted by controlling the temperature and pressure during heat treatment.

The invention relates to a water photovoltaic thin film device based on titanium dioxide and a preparation method and application thereof, and the preparation method comprises the following steps: transversely coating two conductive carbon pastes on a flexible substrate through a blade coating method, and drying to form two parallel wires to obtain a substrate with a wire layer; longitudinally coating a layer of titanium dioxide slurry on the substrate with the wire layer, wherein the titanium dioxide slurry is formed by mixing titanium dioxide nano powder, a binder and an organic solvent; and drying to form a titanium dioxide film, thereby obtaining the water photovoltaic film device based on titanium dioxide. The water photovoltaic thin film device based on titanium dioxide can generate continuous water photovoltaic electric energy through water evaporation driving, a self-driving signal source is provided for the device, so that dependence on an external power supply is avoided, meanwhile, as an N-type semiconductor, the conductivity of the device is highly sensitive to the environmental oxygen concentration, and by measuring an electric signal spontaneously generated by the device, the oxygen concentration of the environment can be accurately measured. The oxygen concentration of the environment can be indirectly sensed with high sensitivity without an external power supply.

This invention discloses an electromagnetic field localization enhancement structure based on a double-layer film and side-polished perovskite optical fiber, comprising: a side-polished single-crystal organometallic perovskite optical fiber, a single-layer graphene film, an alumina film, and a titanium dioxide film; the single-layer graphene film, alumina film, and titanium dioxide film are sequentially disposed above the polished surface of the side-polished single-crystal organometallic perovskite optical fiber; the interaction between the fiber mode and the single-layer graphene in the side-polished single-crystal organometallic perovskite optical fiber is achieved based on the double-layer film structure composed of the alumina film and titanium dioxide film with successively increasing refractive indices, thereby realizing the localization enhancement of the electromagnetic field at the graphene; the localization enhancement effect of the electromagnetic field at the graphene is modulated by controlling the thickness of the double-layer film of alumina film and titanium dioxide film deposited on the side-polished single-crystal organometallic perovskite optical fiber with transferred single-layer graphene. This invention enables efficient interaction between the transmitted optical field in the fiber core and two-dimensional materials, providing a framework for integrating high-performance photodetectors, sensors, and nonlinear devices on perovskite optical fibers.

The invention relates to a medicine film coating, in particular to a titanium dioxide-free white film coating formula. In the formula of the titanium dioxide-free white film coating, the dry powder formula of the white film coating comprises the following components in percentage by weight: 20-70% of a film material, 1-30% of a plasticizer, 20-50% of an opacifying agent, 0-50% of an anti-sticking agent and 0-10% of a common auxiliary agent for improving the coating effect. According to the white film coating formula disclosed by the invention, the components with specific requirements are mixed according to a certain proportion, so that the whiteness of the obtained white film coating is the color and luster shown after the components in the formula interact; in the formula, the film-forming polymer can form a crystal region interface beneficial to light scattering, and the calcium carbonate with specific morphology and particle size is combined, so that the transmission of light can be greatly reduced, and finally a product of which the whiteness is basically equivalent to that of the titanium dioxide-containing film coating is obtained, so that the product can meet the ever-increasing health requirements of people and improve the brand competitiveness.

The invention discloses a method for regulating and controlling crystallization of a perovskite thin film based on a potassium nitrate modified buried interface. The method comprises the following steps: dissolving potassium nitrate in DMSO; coating a DMSO solution of potassium nitrate on the titanium dioxide film by adopting a spin-coating method, and annealing to obtain a potassium nitrate buried interface modification layer; and preparing a perovskite layer on the potassium nitrate buried interface modification layer to obtain the potassium nitrate modified perovskite thin film. The prepared potassium nitrate modified perovskite thin film can be further used for preparing a perovskite photovoltaic device. According to the invention, potassium nitrate is used as a bottom-buried interface modification layer, in the annealing crystallization process of the perovskite film, perovskite crystallization can be delayed, a glossy perovskite film with a large grain size is formed, defects at the grain boundary of the perovskite film and in the crystal are passivated, the transmission capability of charges at the bottom-buried interface is improved, and the performance of a photovoltaic device is improved. The method is low in cost and suitable for large-scale perovskite solar photovoltaic devices, especially for preparation of perovskite cells.

The invention relates to the technical field of composite materials, in particular to a method for preparing a glass fiber membrane loaded black titanium dioxide composite membrane. The method comprises the following steps: uniformly mixing TiO2 powder with a PVA (Polyvinyl Alcohol) solution A, granulating and drying to obtain TiO2 particles; a graphite powder layer A, a TiO2 particle layer and a graphite powder layer B are sequentially laid in the graphite crucible from bottom to top; carrying out in-furnace calcination, sample preparation and ball milling on the graphite crucible to obtain black titanium dioxide nano powder; dispersing black titanium dioxide nano powder with a PVA solution B to obtain black titanium dioxide slurry; and carrying out suction filtration on the black titanium dioxide slurry by adopting a glass fiber filter membrane to prepare the glass fiber membrane loaded black titanium dioxide composite membrane. The method provided by the invention not only overcomes the technical barrier of the black titanium dioxide thin film process, but also retains the performance index of the black titanium dioxide, simplifies the process flow, reduces the production cost, and is beneficial to reflecting the high-value application of the black titanium dioxide.

The invention discloses a refractive index reversible regulation and control method of a nano titanium dioxide film. The method specifically comprises the following steps: step 1, modifying titanium dioxide with acrylic acid; step 2, preparing a polymer with a reversible structure; step 3, preparing titanium dioxide with a reversible refractive index according to products obtained in the step 1 and the step 2; and 4, preparing the titanium dioxide film with the reversible refractive index according to the product obtained in the step 3. The titanium dioxide-based thin film material with high refractive index is obtained by constructing valence bond compounding of conjugated sulfur macromolecules and nano titanium dioxide, and reversible regulation and control of the refractive index of the thin film are realized by utilizing reversible change of an anthracene structure.

The application discloses a kind of high-performance micro-nano composite material and preparation method thereof, it is related to the field of nano composite material.The application is first carbon source and silicon source are mixed, add pore forming agent to form porous preform, then use high-power microwave heating, prepare network-like silicon carbide fiber.The application is first used grid-like silicon carbide fiber, silicon carbide powder, mixed and dissolved to form preform, use nano zirconium dioxide as modified material, then add titanium dioxide gel, titanium dioxide gel enters pore, solidification and crystallization will occur to titanium dioxide when sintering, simultaneously form a layer of titanium dioxide film in sintering process, increase bonding strength, improve material performance.The micro-nano porous composite ceramic prepared by the application uses network-like silicon carbide fiber as skeleton, connects silicon carbide powder and nano zirconium oxide, and forms double-layer ceramic structure by compounding titanium dioxide, with high carrier strength, strong toughness, and three-dimensional communication, internal structure is stable under high impact, and performance is superior.

The invention discloses a titanium oxide nanosheet photoelectric film material and a preparation method thereof, and belongs to the technical field of functional films. According to the preparation method, the oxygen content controllable pulse radio frequency temperature control reactive sputtering technology is adopted, self-organization growth and amorphous stable regulation and control of the titanium oxide nanosheets are achieved at the temperature of 50-100 DEG C, and therefore the titanium oxide thin film material of the amorphous porous layered nanosheet island-shaped structure is obtained. The titanium oxide nanosheet photoelectric thin film material prepared by the invention has an amorphous porous layered nanosheet island-shaped tissue structure, and the thin film material is endowed with excellent optical modulation performance and electrochemical energy storage performance, so that the thin film material can synchronously realize storage and release of electric quantity in an electrochromic process; and the energy storage state can be visually represented through color change, and the method is suitable for the fields of photoelectric multifunctional devices, intelligent dimming energy storage devices and other related advanced energy devices.

The utility model relates to the field of sewage treatment equipment, in particular to a rural sewage treatment device which comprises a base, a purification assembly is arranged on the surface of the top of the base, and a limiting assembly is arranged on the surface of the purification assembly. After rural sewage is collected by the water storage tank, the annular column on the surface of the first trapezoidal plate and the water bottle form a lower siphon auxiliary device, the water bottle is communicated with the water storage tank through the guide pipe, and hydrostatic pressure difference is formed by the height difference between the water storage tank and the first filter tank; high-position water generates a siphonic effect through a U-shaped pipe structure, unpowered self-circulation water guiding is achieved, meanwhile, common earthworm feces and carbon are mixed through the second filtering box and the filtering tank to serve as a filtering material, the filtering effect is improved, a titanium dioxide film deeply removes bacteria through photocatalysis under the condition of ultraviolet light illumination, and the water quality is improved. A ferroferric oxide particle layer assists activated carbon to adsorb heavy metal ions, and the angle of the rotating frame is conveniently adjusted through a connecting cylinder and a second convex column.

The invention discloses a thin film device for enhancing photocatalytic performance based on a water photovoltaic effect and a hydrogen production method thereof. The thin film device comprises a PVC substrate layer; the plurality of carbon paste wires are arranged at intervals and cover the PVC substrate layer; and the titanium dioxide film is arranged in a continuous area on the PVC substrate layer and covers all the PVC substrate layer and the at least two carbon paste wires in the continuous area. The PVC is used as the substrate layer, the carbon paste wire is formed on the substrate layer, then the titanium dioxide thin film is communicated with the carbon paste wire to form the thin film device for enhancing the photocatalytic performance based on the hydro-voltaic effect, and the device can achieve in-situ coupling of the hydro-voltaic effect and the photocatalytic process under the evaporation and illumination conditions, so that the hydrogen production efficiency is improved.

To provide a technique for forming a film of rutile-type titanium oxide on the surface of a synthetic resin material without deforming or dissolving the synthetic resin material. The method for forming a rutile titanium oxide film is a method for forming a thin film of rutile titanium oxide on a target surface of an object, and includes a power supply step of supplying power at a predetermined frequency N to a target T containing Ti, wherein the instantaneous power density of the power in the power supply step is 1.1 kW / cm. 2 The average power density is 5.8 W / cm 2 The following is the result.

The invention relates to the technical field of PSU plastic machines, and in particular to a high-toughness PSU plastic and a preparation method thereof. The high-toughness PSU plastic is composed of the following raw materials: 60-80 parts of PSU resin, 5-20 parts of toughening agent, 0.3-1 part of lubricant, 0.1-0.5 part of antioxidant, 0.1-0.5 part of light stabilizer, and 5-12 parts of compatibilizer. In the invention, the mechanical properties of the PSU plastic can be effectively improved by the fibrous toughening agent, the toughness of the PSU plastic can be improved, and the application occasions of the PSU plastic can be expanded. In the invention, uniformly distributed micropores exist on the titanium dioxide film outside the cellulose, so that when the toughening agent is mixed with the PSU resin, the cellulose can still contact with the organic component, the compatibility of the toughening agent and the PSU resin is improved, the toughening agents are not easy to agglomerate, and the modification effect is good.

The invention discloses a noble metal modified epitaxial titanium dioxide single crystal film, a gas sensor and a preparation method of the noble metal modified epitaxial titanium dioxide single crystal film. According to the preparation method of the titanium dioxide single crystal thin film, sputtering is carried out in a vacuum cavity through a direct-current reaction magnetron sputtering method, Ti ions are obtained through a Ti target, meanwhile, oxygen is introduced for reaction, and the deposited titanium dioxide single crystal thin film is obtained. Through an electron beam evaporation method, precious metal is evaporated on the surface of the titanium dioxide film for modification. The titanium dioxide single crystal thin film prepared by the method has a relatively large specific surface area and a large number of active gas adsorption sites; precious metal modification is beneficial for improving the gas-sensitive performance. The sensor has the gas sensitive performance of high sensitivity and selectivity, low detection limit, quick response, good long-term stability and moisture resistance, and is very suitable for low-concentration hydrogen detection and lithium ion battery thermal runaway early safety early warning.

According to the SPR refractive index sensor based on the double-C-type microstructure optical fiber and preparation of the SPR refractive index sensor, the sensor is of a cylinder structure, the cross section of the cylinder is of a double-C-type quasi-circular structure, and the SPR refractive index sensor comprises a silicon dioxide substrate, air circular holes, a gold thin film layer and a titanium dioxide thin film layer; the silicon dioxide substrate is of a double-C-shaped quasi-circular structure, the double-C-shaped quasi-circular structure is formed by polishing and grinding a section of C-shaped notch on each of two opposite side surfaces of the silicon dioxide substrate, four air circular holes are formed in the silicon dioxide substrate and are uniformly distributed in the double-C-shaped quasi-circular structure in a square shape, the metal thin film layer is attached to the outer side of the C-shaped notch, and the titanium dioxide thin film layer is attached to the outer side of the metal thin film layer. During preparation, the sensor is formed by drawing, drilling, stacking and assembling, stretching and polishing deposition in sequence, and the prepared sensor has good sensing application performance. The preparation method is simple in process flow, provides an important theoretical basis for the design of the microstructure optical fiber sensor, and has a good application prospect in the fields of biomedical detection, chemistry and chemical engineering analysis and the like.

This invention provides an antimony-based solar cell and its fabrication method, belonging to the field of solar cell technology. The fabrication method of the antimony-based solar cell includes: after forming an electron transport layer on a conductive substrate and before forming an antimony-based light-absorbing layer on the electron transport layer, performing a surface modification treatment on the electron transport layer, wherein the electron transport layer comprises a titanium dioxide thin film; the surface modification treatment includes: coating the surface of the electron transport layer with a thiamine solution, wherein the thiamine solution comprises a solution formed by dissolving a sulfur source in an amine solvent; and annealing the electron transport layer coated with the thiamine solution in air to obtain the surface-modified electron transport layer. This invention, through the synergistic effect of the sulfur source and amine molecules, reduces the oxygen vacancy defect density on the surface of the titanium dioxide thin film, enabling the fabrication of a highly crystalline, low-defect-concentration antimony-based thin film on the surface-modified electron transport layer, thereby improving the photoelectric performance of the antimony-based solar cell.

The application provides an antimony-based solar cell and a preparation method thereof, and belongs to the technical field of solar cells. The preparation method of the antimony-based solar cell comprises the following steps: after forming an electron transport layer on a conductive substrate and before forming an antimony-based light absorption layer on the electron transport layer, performing surface modification treatment on the electron transport layer, wherein the electron transport layer comprises a titanium dioxide film; the surface modification treatment comprises the following steps: coating a thiamine solution on the surface of the electron transport layer, wherein the thiamine solution comprises a solution formed by dissolving a sulfur source in an amine solvent; and performing annealing treatment on the electron transport layer coated with the thiamine solution in an air environment to obtain the surface-modified electron transport layer. Through the synergistic effect of the sulfur source and the amine molecules, the surface oxygen vacancy defect density of the titanium dioxide film is reduced, the antimony-based film with high crystallinity and low defect concentration can be prepared on the surface-modified electron transport layer, and the photoelectric performance of the antimony-based solar cell is improved.

The present application relates to a modified titanium-tantalum alloy material and a surface modification method and application. The modified titanium-tantalum alloy material comprises a titanium-tantalum alloy substrate, and a titanium dioxide film is attached to the surface of the titanium-tantalum alloy substrate. The present application also provides a surface modification method of the modified titanium-tantalum alloy material, comprising the following steps: placing a titanium-tantalum alloy substrate in a mixed solution containing ammonium fluoride, hydrogen peroxide, isopropyl alcohol and water, and performing a hydrothermal reaction; placing the titanium-tantalum alloy substrate after the hydrothermal reaction in an alkaline solution for soaking, so as to perform fluorine ion replacement, and cleaning to obtain an intermediate product; and performing low-temperature plasma treatment on the intermediate product in a mixed atmosphere of argon and oxygen, to obtain a titanium-tantalum alloy with a biologically active titanium dioxide film attached to the surface. The present application provides the application of the modified titanium-tantalum alloy material as a biomedical material. The present application solves the problem that the existing titanium-tantalum alloy material has low biological activity as a biomedical material.

The utility model discloses a high-temperature-resistant narrow-band infrared optical filter. The high-temperature-resistant narrow-band infrared optical filter comprises a glass substrate; the narrow-band infrared filtering layer is arranged on the surface of one side of the glass substrate and comprises a plurality of layers of silicon dioxide films, a plurality of layers of tantalum pentoxide films and at least one layer of titanium dioxide film, and the silicon dioxide films and the tantalum pentoxide films are alternately stacked; and the titanium dioxide film is arranged between at least one group of adjacent silicon dioxide film and tantalum pentoxide film. The narrow-band infrared optical filter can improve the signal-to-noise ratio of infrared light, and has the functions of high temperature resistance and heat insulation.

The invention discloses an electromagnetic field local enhancement structure based on a double-layer film and a side-polished perovskite optical fiber. The electromagnetic field local enhancement structure comprises a side-polished single-crystal organic metal perovskite optical fiber, a single-layer graphene film, an aluminum oxide film and a titanium dioxide film, the single-layer graphene thin film, the aluminum oxide thin film and the titanium dioxide thin film are arranged above the polishing and grinding surface of the side edge polishing and grinding single crystal organic metal perovskite optical fiber layer by layer; based on a double-layer film structure formed by an aluminum oxide thin film and a titanium dioxide thin film of which the refractive indexes are sequentially increased, interaction between an optical fiber mode and single-layer graphene in the side-polishing single-crystal organic metal perovskite optical fiber is completed, and local enhancement of an electromagnetic field at the graphene is realized; the local enhancement effect of the electromagnetic field at the graphene is regulated and controlled by controlling the double-layer film thickness of the aluminum oxide film and the titanium dioxide film deposited on the side-polished single-crystal organic metal perovskite optical fiber transferred with the single-layer graphene. According to the invention, efficient interaction between a transmission light field and a two-dimensional material in the fiber core can be realized, and a thought is provided for integrating a high-performance photoelectric detector, a sensor and a nonlinear device on the perovskite optical fiber.

This invention relates to the field of organic photonics and laser device technology, specifically disclosing a laser based on a mesoporous titanium dioxide substrate and its fabrication method. The laser comprises a transparent substrate, a mesoporous titanium dioxide thin film on the substrate, and an organic conjugated polymer gain medium layer on the titanium dioxide thin film. The mesoporous titanium dioxide layer is fabricated by spraying or spin coating, utilizing its disordered porous structure to provide light scattering feedback. Low-threshold random laser emission can be achieved under optical pumping without the need for a traditional precision resonant cavity. This device features a simple structure, low fabrication cost, good process compatibility, and applicability to polymer gain media with various emission wavelengths, providing a new technical path for realizing low-cost, easily integrated electrically pumped organic lasers.

The invention relates to the technical field of biosensors, and particularly discloses a DNA-modified titanium dioxide film sensor as well as a preparation method and application thereof. The method comprises the following steps: plating gold on a titanium dioxide nanotube prepared by an anodic oxidation method, modifying a DNA probe under the action of a gold sulfhydryl bond, obtaining electrons by taking a platinum electrode as a cathode and losing electrons by taking metal titanium as an anode in an electrolyte in an oxidation process, and oxidizing under external voltage. Due to the existence of the nano pore channels, under the illumination condition, photon-generated carriers can directionally migrate along the surface potential in the direction of the pore channels and drive ions in the pore channels to directionally move; the specific recognition effect of the surface probe and the target causes the change of the surface charge and changes the surface potential, so that a measurable electric signal is generated, and universal target detection and multi-target simultaneous in-situ detection can be realized. The method provided by the invention has great significance in early detection, screening and treatment of prostate cancer.