153 results about "Carbon quantum dots" patented technology

The application relates to a composite type corrosion and scale inhibition water treatment agent, which is obtained by in-situ copolymerization of phosphono carboxylic acid copolymer after modification of nitrogen-doped carbon quantum dots on the surface of attapulgite as a carrier. The application has the beneficial effects that: the attapulgite is used as the carrier, can be used as a grafting bridge to load the carbon quantum dots on the surface and in-situ generate the phosphono carboxylic acid copolymer, and has a synergistic effect; the nitrogen-doped carbon quantum dots have rich amino, carboxyl and hydroxyl functional groups on the surface, make it difficult for calcium carbonate microcrystals to gather or interfere with the normal growth of the crystals to inhibit scale crystal generation, have high stability, are coated with zinc ions, improve the antibacterial property of the material, are modified on the surface of the attapulgite, have excellent adsorption performance, and can effectively remove organic matters, heavy metals and the like in water; the phosphono carboxylic acid copolymer is in-situ generated on the surface of the attapulgite, has a good compounding effect, has a good effect on corrosion inhibition, and has good corrosion inhibition performance.

The invention discloses a sulfur-nitrogen co-doped carbon quantum dot modified polyaspartic acid derivative as well as a preparation method and application thereof. The derivative is prepared by taking citric acid and L-cysteine as precursors, synthesizing sulfur-nitrogen co-doped carbon quantum dots (SN-CDs) with rich functional groups on the surface by adopting a hydrothermal method, and introducing the sulfur-nitrogen co-doped carbon quantum dots into a side chain of polyaspartic acid (PASP) through graft copolymerization. The derivative not only retains the complexing ability of polyaspartic acid with metal ions such as calcium and magnesium, but also has excellent scale and corrosion inhibition performance; the optical characteristics of the carbon quantum dots are inherited, and stable fluorescence can be emitted under the excitation of specific wavelength, so that in-situ and real-time concentration monitoring in an industrial circulating cooling water system by utilizing a fluorescence spectrum technology is supported. The product does not contain phosphorus, is environment-friendly, conforms to the development trend of a green water treatment technology, and provides an innovative material solution for intelligent monitoring and fine management of a circulating water system while improving the comprehensive performance of scale and corrosion inhibition.

This invention discloses a self-cleaning radiative cooling coating based on biomass carbon quantum dots, its preparation method, and its application. The coating comprises a polymer film-forming resin, carbon quantum dots, and hollow glass microspheres; wherein the mass ratio of the polymer film-forming resin to the filler is 1:(0.1-0.5), and the mass ratio of the hollow glass microspheres to the carbon quantum dots is 1:(0.05-0.2). This invention synergistically enhances solar reflectivity through the photoluminescence properties of carbon quantum dots and the scattering properties of hollow glass microspheres, while simultaneously utilizing the synergistic effect of fluorinated resin and modified hollow glass microspheres to endow the coating with superhydrophobic self-cleaning function. A single layer of this coating can achieve a solar reflectivity >92%, mid-infrared emissivity >94%, and contact angle >150°, possessing both efficient daytime radiative cooling and long-lasting self-cleaning performance. It is particularly suitable for passive heat dissipation of outdoor equipment such as new energy vehicle charging piles, and features simple process, environmental friendliness, and excellent performance.

This invention belongs to the field of heavy metal ion detection technology, specifically relating to a method for detecting Co based on microwave-synthesized histidine carbon quantum dots from yam. 2+ The method involves adding ground yam powder and histidine to deionized water, stirring, and then microwaving. After centrifugation, the supernatant is filtered through a filter membrane, and the filtrate is the yam-doped histidine carbon quantum dot (F-CDs) mother liquor. Different concentration gradients of Co are added to the F-CDs mother liquor. 2+ Subsequently, the fluorescence intensity of the F-CDs mother liquor increased with Co. 2+ The quenching efficiency F / F0 and Co gradually decrease with increasing concentration. 2+ In 1×10 ‑6 ~9×10 ‑6 The method exhibits good linearity within the mol / L concentration range and demonstrates good selectivity, indicating that it is effective for Co. 2+ The detection is characterized by its sensitivity, speed, and high selectivity.

This application relates to the field of bio-agricultural technology, specifically disclosing an agricultural composition and its application based on carbon quantum dots to enhance crop photosynthesis. It is made from raw materials comprising the following parts by weight: 3-8 parts nitrogen-doped carbon quantum dots; 8-25 parts biostimulant; 1-4 parts wetting and dispersing agent; and 200-800 parts water. The nitrogen-doped carbon quantum dots are prepared by reacting aniline derivatives and biochar under a nitrogen atmosphere, followed by cooling to room temperature. Its application involves: S1, diluting the agricultural composition with water to the effective concentrations of carbon quantum dots and biostimulant; S2, applying the diluted agricultural composition to crop growth stages via foliar spraying or drip irrigation. The agricultural composition of this application can promote crop growth, increase biomass and yield, and has the advantages of ensuring uniform and stable dispersion of nitrogen-doped carbon quantum dots in solution and synergistically enhancing photosynthetic performance with biostimulant.

The application belongs to the technical field of hydrogen production catalysts for electrolysis of water, and particularly relates to a preparation method of a nitrogen-doped carbon quantum dot loaded ruthenium-based hydrogen evolution electrocatalyst, which comprises the following steps: (1) taking alkali lignin and urea, adding them into deionized water, mixing uniformly, then adding ruthenium trichloride, mixing uniformly, and performing hydrothermal reaction to obtain a precursor; (2) after the precursor is reduced to room temperature, freeze-drying and annealing are performed to obtain the nitrogen-doped carbon quantum dot loaded ruthenium-based hydrogen evolution electrocatalyst. The electrocatalyst prepared by the method has high catalytic activity and stability, and can particularly exhibit excellent catalytic performance in a full pH range (including acid, neutral and alkaline conditions, i.e. 0-14 pH values).

The application provides a preparation method of a ratio fluorescent aptamer sensor for detecting streptomycin in milk, and belongs to the field of food safety detection. The application comprises screening of streptomycin (STR) specific aptamer and construction of a ratio fluorescent sensor. The STR aptamer (Apt) is obtained by using a magnetic graphene oxide screening technology for the first time, the binding site is analyzed according to the secondary structure and molecular docking analysis, and the Apt52 with the best affinity to the target is obtained by truncation. The carbon quantum dots (CQDs) modified by the Apt52 are used as a reference signal, the AgNCs-SMP@ZIF-8 is used as a response signal to construct a fluorescent sensing method for judging whether the streptomycin is contained in the sample to be detected. The specific binding of the aptamer to the target causes the AgNCs-SMP@ZIF-8 to expose and quickly adsorb a large amount of Cu 2+ The fluorescence signal of the AgNCs-SMP@ZIF-8 is quenched, and the fluorescence signal of the CQDs always remains stable, and the streptomycin residue is detected by the fluorescence signal ratio change of the AgNCs-SMP@ZIF-8 and the CQDs. The detection limit of the sensor for the STR is 0.978 nM, and the sensor has satisfactory specificity and sensitivity.

This invention relates to the field of shape memory material preparation technology, specifically to a bio-based shape memory Eucommia ulmoides gum composite material and its preparation method. All components of the composite material are of entirely bio-based origin, using natural Eucommia ulmoides gum as the matrix. Nano-hybrid seed crystals composed of cellulose nanocrystals and carbon quantum dots are introduced. The cellulose nanocrystals act as nucleating agents, guiding and accelerating the cooling crystallization of the Eucommia ulmoides gum, while the carbon quantum dots form the shell, improving heat transfer efficiency. In the preparation process, this application uses triacylglycerol lipase as a biocatalyst, which can initiate an in-situ esterification reaction between the filler and the matrix at a low temperature of 65-75℃. This not only reduces energy consumption but also avoids the thermal degradation and damage to the Eucommia ulmoides gum macromolecular chains caused by high-temperature strong shear, achieving high performance and batch-to-batch stability of the material.

The present application relates to the technical field of optical resin lens preparation, in particular to a kind of polyurethane lens based on carbon quantum dots and preparation method thereof.The present application uses 174 high refractive index sulfur-containing polyurethane as base material, constructs high refractive index carbon quantum dots by heavy atom doping, high conjugated fused ring and surface high refractive group grafting, adopts bulk doping composite surface coating process, realizes the small amplitude increase of 0.002~0.01 of lens refractive index on the basis of maintaining lens 1.74 high refractive index, and simultaneously gives full-waveband ultraviolet blocking, precise harmful blue light filtering, high-efficiency antibacterial and high wear resistance, solves the technical problems that traditional polyurethane lens is prone to yellowing, single function, poor wear resistance and antibacterial property, and refractive index is difficult to further improve.The refractive index of the lens prepared by the present application is stable at 1.74-1.75, the visible light transmittance is greater than or equal to 95%, the ultraviolet blocking rate is greater than or equal to 99%, the antibacterial rate is greater than or equal to 99.9%, the pencil hardness is more than 2H, there is no haze and no yellowing, and it is suitable for high-end myopia correction, medical eye protection, children wearing and other scenes, and the process can be mass-produced.

The application provides a thioglycolic acid modified carbon quantum dot, which is prepared by the following method: (1) preparing a carbon quantum dot solution by using Dicranopteris dichotoma leaves and / or Ricinus communis leaves as raw materials; (2) adding thioglycolic acid into the carbon quantum dot solution obtained in the step (1) so that the concentration of the thioglycolic acid is 0.5mmol-5mmol; after being sufficiently dissolved and mixed, the reaction is carried out at 100-140 DEG C for 1-6 hours to obtain the thioglycolic acid modified carbon quantum dot. The application finds that under suitable conditions, the inhibition effect of the thioglycolic acid modified carbon quantum dot on Ralstonia solanacearum is significantly enhanced, and the minimum inhibitory concentration and the bactericidal concentration are obviously reduced.

This invention provides a method for preparing carbon quantum dots, their application in the detection of 4-nitrophenol and curcumin, a concentration detection method, and a visualization detection method. The method involves mixing tris(hydroxymethyl)aminomethane and phloroglucinol in a solvent, followed by heating in a reaction vessel to obtain the carbon quantum dots. This invention provides a simple and low-cost method for preparing carbon quantum dots, enabling rapid and low-cost detection of 4-NP and curcumin, thus meeting the detection needs for both.

The application provides an inner light source coupling micro-nano carbon supply reinforced microalgae plastic removal and carbon fixation system and method, which comprises a light reinforcement module, a micro-nano gas oscillation carbon supply module, a photobioreactor main body and an algae plastic collection and resource utilization module; the light reinforcement module, the micro-nano gas oscillation carbon supply module and the algae plastic collection and resource utilization module are connected with the photobioreactor main body respectively; the light reinforcement module adds carbon quantum dots and plant hormone IAA into the photobioreactor main body, and realizes composite illumination in cooperation with illumination; the micro-nano gas oscillation carbon supply module transports micro-nano dispersed CO2 into the photobioreactor main body, and makes the deagglomeration of microplastics in water; the algae plastic collection and resource utilization module collects, processes and realizes resource utilization of the microalgae mixture adsorbing microplastics in the photobioreactor main body. The application aims to realize efficient removal of microplastics, efficient fixation of CO2 and resource utilization of biomass.

This invention belongs to the technical field of high-performance concrete protective materials, specifically relating to a photothermal nanomonomer fluid, its preparation method, and its application in polymer-impregnated concrete. The fluid consists of component A and component B, with a mass ratio of component A to component B of 1:(0.01–0.05). Component A mainly consists of the following raw materials in parts by mass: 80–100 parts of acrylate monomers, 0.1–10 parts of photothermal nanomaterials, 0–5 parts of organosilicon monomers, and 0–10 parts of crosslinking monomers. Component B is an initiator. The photothermal nanomaterials are at least one of carbon nanotubes, graphene, graphene oxide, and carbon quantum dots. The fluid can be applied to polymer-impregnated concrete, utilizing the localized thermal effect of the photothermal nanomaterials to initiate in-situ polymerization of monomers. This invention is highly efficient and energy-saving, avoiding damage from overall heating. The resulting concrete has densely filled pores, significantly improving mechanical strength and durability, making it suitable for high-performance engineering protection.

The application belongs to the technical field of graphene materials, and particularly relates to a high-thermal-conductivity graphene composite film for electronic components and a preparation method thereof. The high-thermal-conductivity graphene composite film for electronic components comprises the following raw materials in mass fractions: 80-90 parts of a thermoplastic polyurethane elastomer, 510 parts of expanded graphite, 12 parts of carbon quantum dots, 0.3-0.8 parts of carbon nanotubes, 150-300 parts of a solvent and 0.1-0.3 parts of a dispersing agent; the expanded graphite is prepared by a chemical oxidation method. The graphene composite film prepared by the application has high in-plane and vertical thermal conductivity coefficients and excellent mechanical properties, and is particularly suitable for preparing insulated gate bipolar transistors.

This invention provides an antibacterial cotton fiber based on silver-doped carbon quantum dots (Ag-CQDs), its preparation method, and its applications, belonging to the field of functional textile materials technology. This invention employs a microwave method for the rapid synthesis of silver-doped carbon quantum dots (Ag-CQDs). Utilizing the instantaneous high temperature, uniform heating, and electron transfer-promoting properties of microwaves, silver ions rapidly combine with the oxygen- and nitrogen-containing functional groups of the carbon precursor, forming a covalent / coordination composite structure of silver-doped carbon quantum dots. Further chemical modification of the cotton fiber generates numerous active reaction sites on its surface. Finally, Ag-CQDs are firmly loaded onto the cotton fiber surface and surface voids through covalent bonds, coordination bonds, and hydrogen bonds, forming a uniform, continuous, strong, and washable antibacterial coating. The resulting silver-doped carbon quantum dot-based cotton fiber exhibits long-lasting antibacterial properties, along with low toxicity, high stability, and good bonding strength, demonstrating excellent application prospects in the field of long-lasting antibacterial textile materials.

The application provides an electrolyte wide-temperature-range additive, a preparation method thereof, a wide-temperature-range electrolyte and a lithium battery. The electrolyte wide-temperature-range additive comprises carbon quantum dots doped with nitrogen elements, sulfur elements and oxygen elements, wherein the content of carbon elements is 60-75 at%, the content of nitrogen elements is 2-10 at%, the content of sulfur elements is 2-10 at%, and the balance is oxygen elements. The electrolyte wide-temperature-range additive provided by the application utilizes the nitrogen elements, sulfur elements and oxygen elements doped by the carbon quantum dots and the nanometer size effect, effectively promotes the migration and desolvation process of lithium ions at the electrode interface under the condition of a wide temperature range, and can form a stable and ion-conducting interface protection layer on the negative electrode surface, thereby inhibiting the decomposition of the electrolyte and the occurrence of electrode-electrolyte side reactions under extreme temperatures.

The application relates to the field of nanomaterials and ion detection, in particular to nitrogen-sulfur co-doped carbon quantum dots with high quantum yield and a preparation method and application thereof. The preparation method of the nitrogen-sulfur co-doped carbon quantum dots with high fluorescence quantum yield comprises the following steps: S1, citric acid and L-cysteine are dissolved in deionized water, and ultrasonic stirring is carried out until the solution is clear; S2, the solution obtained in step S1 is transferred into a reaction kettle, and hydrothermal reaction is carried out for 4-10 hours; S3, the reaction product of step S2 is cooled to room temperature, the supernatant is collected by centrifugation, and the solution in the dialysis bag is collected by suction filtration and dialysis, so that the nitrogen-sulfur co-doped carbon quantum dots are obtained. The carbon quantum dots prepared by the application have the characteristics of high quantum yield, and Fe 3+ can produce a significant fluorescence quenching effect. The carbon quantum dots exhibit high selectivity, excellent anti-interference ability and high sensitivity, and have important practical application value in the field of metal ion detection. 3+ ​

The invention relates to a flexible rare earth nanocrystalline composite light-emitting film and a preparation process thereof, and belongs to the technical field of rare earth light-emitting display. The composite light-emitting film comprises a flexible polymer matrix, rare earth nanocrystals and modified carbon quantum dots, wherein the rare earth nanocrystals and the modified carbon quantum dots are uniformly dispersed in the flexible polymer matrix; wherein the rare earth nanocrystal is of a core-shell structure, the core is hexagonal phase NaYF4 doped with Yb < 3 + > and Tm < 3 + >, the shell is undoped NaYF4, and the particle size of the rare earth nanocrystal is 5-50 nm; the obtained film has excellent optical transparency, flexibility and luminescence property.

Novel water / gas ratio reducer compounds comprising metal-doped carbon quantum dots, methods of their manufacture, sandstone and limestone gas well compositions containing the water / gas ratio reducer compounds and methods of their use are disclosed. The novel water / gas ratio reducer compounds are useful, inter alia, to decrease Kw / Kg ratio for the reservoir output, reduce the water permeability in the reservoir and / or increase gas permeability in the reservoir use, increase production rate, to increase total output from the reservoir, are more environmentally acceptable, employable at much lower concentrations, are reusable, may be used in a wider range of gas well drilling fluids including, for example, seawater-based drilling fluids and / or more cost-effective in use.

This invention relates to copper single-atom carbon dot nanozymes with SOD enzyme activity, their preparation methods, and applications. The copper single-atom carbon dot nanozyme with SOD enzyme activity is obtained by loading copper single atoms onto the surface of nitrogen-doped carbon quantum dots, wherein the copper single atoms are in Cu... 2+ The nitrogen-doped carbon quantum dots are dispersed on the surface of nitrogen-doped carbon quantum dots. In this invention, the surface of the nitrogen-doped carbon quantum dots contains various asymmetric C and N sites, and the presence of N is beneficial for promoting Cu... 2+ Dispersion, reduction of Cu 2+ Reunion, through N and Cu 2+ Coordination to achieve stable Cu 2+ The atomic-level dispersion ensures the high activity, stability, and metal economy of the copper single-atom carbon nanodot nanozyme with SOD enzyme activity of the present invention.

This invention provides a method for preparing carbon quantum dots from petroleum coke, relating to the field of carbon nanomaterials technology. The method includes calcining petroleum coke and then subjecting it to adaptive oxidative pyrolysis with an additive containing phosphotungstic acid, an ionic liquid, and hydrogen peroxide; nitrogen doping; and surface stabilization treatment with a stabilizer composed of sodium hyaluronate, poloxamer 188, and sodium citrate; finally, carbon quantum dots are obtained by pH adjustment flocculation, centrifugation, dialysis, and drying. This method achieves efficient and green conversion of petroleum coke under mild conditions through the synergistic effect of specialized additives and stabilizers. The prepared carbon quantum dots have the advantages of high fluorescence quantum yield, good dispersion stability, and high yield, providing a new approach for the high-value utilization of petroleum coke.

This invention discloses a fluorescence emission-independent excitation carbon quantum dots and its preparation method. The method includes: Step 1, mixing o-phenylenediamine and boric acid at a molar ratio of 4 mmol:(1.2~4 mmol), grinding the mixture, transferring it to a square ceramic boat, and placing it in an oven. Under air atmosphere, the temperature is increased from room temperature to 100~135℃ at a heating rate of 5℃ / min, and the solid-phase reaction is carried out for 4~6 h. The mixture is then naturally cooled to room temperature to obtain a brownish-red solid; Step 2, dissolving the brownish-red solid in deionized water and sonicating it to obtain a yellowish-brown liquid; Step 3, filtering the yellowish-brown liquid to obtain a pure carbon quantum dot aqueous solution; Step 4, freeze-drying the carbon quantum dot aqueous solution to obtain carbon quantum dot powder. This invention simplifies the process flow, reduces energy consumption and post-processing complexity, and provides controllable reaction process. The prepared carbon quantum dots exhibit fluorescence emission-independent characteristics and long-wavelength orange fluorescence.

This invention belongs to the field of fluorescent materials, specifically lemon peel-based multicolor luminescent carbon quantum dots, their preparation, application, and luminescent devices. The preparation method of lemon peel-based multicolor luminescent carbon quantum dots is as follows: lemon peel and formula 1 () are dispersed in a solvent at a weight ratio of 1:0.1~2, followed by a first-stage reaction at 70~100°C, and then solid-liquid separation to obtain a first-stage reaction solution; the first-stage reaction solution is then subjected to a second-stage solvothermal reaction at 160~220°C. By adjusting the weight ratio of lemon peel and formula 1 and the temperature of the second-stage solvothermal reaction, lemon peel-based multicolor luminescent carbon quantum dots are obtained. This invention can efficiently convert waste lemon peel into multicolor carbon quantum dots with tunable fluorescence color and high quantum yield.

The application provides a kind of near-infrared absorption cerium-doped carbon quantum dots nanoscale enzyme, preparation method and application, it is related to biomedical technology field, wherein the preparation method steps are as follows: S1: take hydrochloric acid dopamine, melamine, cerium nitrate, use anhydrous ethanol to soak thoroughly;S2: the mixture obtained in S1 is transferred to polytetrafluoroethylene lining hydrothermal reactor for reaction;S3: the solution in S2 is reacted with high-speed centrifugation, take supernatant and wash with anhydrous ethanol;After washing, dialysis is carried out with anhydrous ethanol, after dialysis, the solution in dialysis bag is spin-dried in a rotary evaporator, and the CeCDs solid is stored at-20 DEG C.The cerium-doped carbon quantum dots constructed by the application have good biocompatibility, can be applied to anti-parkinson disease, the carbon-based nanoscale enzyme CeCDs has SOD and CAT nanoscale enzyme catalytic activity, is used for the treatment of Parkinson's disease, and can pass through blood-brain barrier, and has good biocompatibility and treatment potential.

This application discloses a method for preparing highly dispersible and stable catalytically active carbon quantum dots and its applications, belonging to the field of quantum dots. The preparation method includes: placing a homogeneous solution containing a carbon quantum dot precursor, water, and an organic solvent in a sealed container and reacting to obtain carbon quantum dots; the carbon quantum dot precursor is selected from at least one of L-ascorbic acid, glucose, cellulose, citric acid monohydrate, citric acid, urea, L-glutamic acid, and m-phenylenediamine. These carbon quantum dots exhibit excellent dispersibility in both aqueous and ethanol solutions, remaining non-agglomerated for several months, and maintaining excellent dispersibility within a pH range of 4–12. Their spectral response extends into the visible light region, enabling highly efficient photocatalytic reactions on their own; therefore, under simulated sunlight irradiation, almost complete decomposition of pollutants can be achieved.

This invention relates to the field of nanomaterials, and discloses a composite nanoparticle, its preparation method, and its application. The preparation method includes: mixing noble metal nanoparticles with an organic synthetic oil and then heating the mixture to react; wherein the organic synthetic oil contains at least one selected from biphenyl compounds, hydrogenated products of biphenyl compounds, biphenyl ether compounds, and alkyl aromatic hydrocarbons. The composite nanoparticle includes a core and a shell covering the core; the core is a noble metal nanoparticle, and the shell is carbon quantum dots; wherein the carbon quantum dots are carbonized products of the organic synthetic oil; and the organic synthetic oil contains at least one selected from biphenyl compounds, hydrogenated products of biphenyl compounds, biphenyl ether compounds, and alkyl aromatic hydrocarbons. This composite nanomaterial exhibits excellent stability and light absorption properties.

This invention discloses a photocatalytic functionalized nylon fabric and its preparation method. The method includes the following steps: (1) mixing carbon quantum dots with nano-titanium dioxide to prepare photocatalytic nanomaterials, and mixing the photocatalytic nanomaterials with a composite emulsion to obtain a composite photocatalytic sizing solution; (2) applying the composite photocatalytic sizing solution to nylon yarn by padding or single-yarn sizing, and drying and curing to obtain nylon sizing yarn with a composite photocatalytic sizing film; (3) weaving the nylon sizing yarn to obtain nylon fabric with a composite photocatalytic sizing film; (4) desizing the nylon fabric, washing and drying it to obtain nylon fabric loaded with a photocatalytic film layer; (5) plasma treating the nylon fabric to form dispersed hydrophilic and hydrophobic regions on the surface of the nylon fabric to obtain the finished product of photocatalytic functionalized nylon fabric. The nylon fabric of this invention has excellent VOC gas degradation efficiency and antibacterial rate.

The application provides a carbon quantum dot and a preparation method and application thereof, a perovskite precursor solution and a preparation method thereof, and a perovskite solar cell and a preparation method thereof, and comprises the following steps: dissolving melamine in a solvent, and then heating and reacting in a reaction kettle to obtain the carbon quantum dot. The carbon quantum dot provided by the application not only has low preparation cost, but also can effectively improve the morphology characteristics of a perovskite layer in the preparation process of the perovskite layer, so that the surface of the final perovskite layer is smoother, the agglomeration of crystal grains is reduced, and thus the defect sites are effectively reduced, and the film forming quality of the perovskite layer is improved. On this basis, the charge recombination in the perovskite solar cell is effectively reduced, the carrier extraction speed and transmission speed are significantly accelerated, and finally the photoelectric conversion efficiency of the battery is obviously improved. In addition, the carbon quantum dot of the application can also improve the stability of the perovskite layer, inhibit the decomposition of the perovskite layer, and thus effectively improve the service life of the perovskite solar cell.