50 results about "Carbon nanodots" patented technology

The invention discloses a preparation method of an environment-friendly degradable single-sided perspective sticker, and belongs to the technical field of modified nano materials. The method comprises the following steps: (1) preparation of a multi-layer composite structure: mixing polylactic acid and poly (butylene succinate), adding nano-montmorillonite and a surface modifier, and carrying out melt blending to form a first-layer melt; stirring poly (butylene adipate-co-terephthalate) and fluorescent carbon nanodots to form a second layer of melt; the first layer, the pressure-sensitive adhesive layer and the second layer are co-extruded and compounded to form a film blank. And (2) construction of the nano-film: biaxially stretching the film blank, imprinting a micropore array, dipping in the silver nanoparticle suspension, and drying to obtain the nano-film. And (3) coating functionalization treatment: immersing into a fluorine-containing nano coating solution, and curing. And (4) post-treatment: carrying out secondary curing. The obtained single-sided perspective sticker is suitable for the fields of buildings, vehicle privacy films and the like, and solves the problems of serious pollution and slow degradation of a traditional sticker.

The invention belongs to the field of battery materials, and discloses a porous carbon material prepared through in-situ crosslinking-curvature induction and a method and application thereof, and the preparation method specifically comprises the following steps: mixing biomass powder with a solution containing acrylate groups, carrying out a hydrothermal reaction to obtain a carbon nanodot suspension, and carrying out rotary evaporation to obtain carbon nanodot powder; performing ultraviolet irradiation on the carbon nanodot powder; dispersing the irradiated carbon nanodot powder in a solvent to form a suspension, placing the suspension in an external field device for curvature induction, and separating, cleaning and drying the induced carbon nanodots to obtain a porous carbon precursor; calcining the porous carbon precursor, and then pickling and drying to obtain the porous carbon material. The porous carbon material has a snake-like squamous structure, the unique structure provides a buffer space for volume expansion of silicon particles in the charging process, stress can be effectively dispersed, mechanical damage caused by volume expansion is reduced, and the cycling stability of the material is improved.

The application relates to a silicon-carbon negative electrode material and a preparation method and application thereof. The preparation method comprises the following steps: obtaining soft carbon microspheres by using a first carbon source for thermal polymerization; performing spray coating of the soft carbon microspheres, a second carbon source, graphite carbon nanodots and an activating agent, cooling and solidifying, first heating and activating, then neutralizing with an acid and washing to obtain a porous carbon sphere precursor; under an inert atmosphere, feeding a silicon source into the porous carbon sphere precursor and performing second heating, so that the silicon source is cracked and elemental silicon is deposited and adsorbed inside the porous carbon sphere to obtain a porous silicon-carbon sphere; heating and warming the porous silicon-carbon sphere and feeding an organic gas to form a carbon layer on the surface of the porous silicon-carbon sphere, and finally obtaining the silicon-carbon negative electrode material. The obtained silicon-carbon negative electrode material can avoid separation of the porous carbon sphere and the homogeneous porous carbon layer after external force roller pressing, can prevent particle breakage, can improve the structural strength of the silicon-carbon negative electrode material, and can further improve the capacity of a battery system and the cycle life.

The invention discloses application of selaginella tamariscina carbon nanodots with anti-inflammatory, anti-dermatitis and skin-care functions, and relates to the field of carbon dots. The preparation method of the selaginella tamariscina extract carbon nanodots comprises the following steps: mixing a selaginella tamariscina extract with deionized water to obtain a selaginella tamariscina aqueous solution; putting the mixture into an autoclave with a polytetrafluoroethylene lining, keeping for 5-7 hours at the temperature of 160-180 DEG C, cooling, centrifuging and filtering to obtain the selaginella tamariscina extract carbon nanodots. The carbon nanodots are used for preparing medicines for resisting inflammation and atopic dermatitis and preparing skin care products.

The invention discloses a carbon nanodot as well as a preparation method and application thereof, and relates to the technical field of carbon nanomaterials. The carbon nanodots are prepared from raw materials including nicotinamide, urea and citric acid or a derivative thereof through solvent heat treatment, and the derivative of the citric acid is selected from citrate, a citric acid hydrate or a hydrate of the citrate. According to the invention, nicotinamide is used as a precursor to synthesize the carbon nanodot under solvent heat treatment, so that the carbon nanodot integrates intrinsic biological activity, efficient photothermal conversion capability and red fluorescence imaging function at the same time, and the limitation of a single therapy is overcome through multifunctional synergistic therapy. In addition, the carbon nanodot provided by the invention has extremely high biological safety.

The present invention relates to the technical field of biomedical materials, and in particular to an experimental method for analyzing the assembly mechanism of carbon nanodots. The present invention discloses an experimental method for analyzing the assembly mechanism of carbon nanodots, comprising the steps of: (1) adding carbon nanodot assemblies to buffer systems of different pH values, molecular structures, and ionic strengths; (2) observing and recording the color change of the carbon nanodot assemblies, the position shift of the characteristic absorption peak of the ultraviolet-visible spectroscopic spectrum, and the change in the absorbance value of the characteristic absorption peak of the ultraviolet-visible spectroscopic spectrum; (3) analyzing the dissociation state of acidic functional groups and basic functional groups in different buffer systems using a pH calculation formula; (4) analyzing the depolymerization process of the carbon nanodot assemblies in combination with step (2) and step (3), and analyzing the assembly mechanism. The experimental and analytical methods designed by the present invention can be used to clarify the assembly mechanism of carbon nanodot assemblies constructed based on hydrogen bonds.

The present invention relates to the use of carbon nanodots to treat wastewater. Specifically, the invention relates to the use of carbon nanodots for improving the efficiency of microorganism-mediate

The application provides a carbon nanodot-based temperature sensor and a preparation method thereof. The carbon nanodot-based temperature sensor comprises, from bottom to top, a substrate layer, an interdigital electrode layer and a sensing layer. The sensing layer comprises hydrophilic carbon nanodot particles and an ionic salt. The sensing layer is formed by drop coating of a mixed aqueous solution of the hydrophilic carbon nanodot particles and the ionic salt. The preparation method is simple and easy to implement, and has low cost. The prepared temperature sensor has high sensitivity, high precision and high stability. The sensitivity of the temperature sensor reaches 345951.8%℃ ‑1 .

The present invention discloses a method for detecting thiourea using carbon nanodots and gold nanoparticles as fluorescent probes, which belongs to the field of analytical detection. The technical solution of the present invention is: fluorescent carbon nanodots are mixed with gold nanoparticles in advance, and the fluorescence of the carbon nanodots will be quenched based on the fluorescence resonance energy transfer effect; then, if thiourea is present in the sample to be tested mixed with the probe, the thiourea will trigger the aggregation of gold nanoparticles through coordination and decombinate the carbon nanodots from the gold nanoparticles, and finally restore the quenched fluorescence of the carbon nanodots. Under the optimized detection conditions, the relative fluorescence intensity of the carbon nanodot-gold nanoparticle probe shows a good linear relationship with the thiourea concentration in the range of 0.05-1μM, and the detection limit (S / N=3) is 0.0362μM. The detection method established by the present invention is not only convenient, but also has excellent selectivity and sensitivity, and can be effectively applied to the detection of thiourea in tap water, lake water and fruit and vegetable juice.

This invention discloses a type of N-doped carbon nanodots and their application in the detection of tinidazole, belonging to the field of analytical detection. The preparation method of the N-doped carbon nanodots in this invention is as follows: L-lysine, ethylenediamine, and water are mixed to form a mixture, which is then heated to react. After the reaction, the N-doped carbon nanodots are purified. This invention is the first to use L-lysine and ethylenediamine as precursors to prepare carbon nanodots and achieve quantitative detection of tinidazole. It is low-cost, highly sensitive, and suitable for rapid on-site detection, possessing high practical value and promising prospects for widespread application.

The invention relates to the technical field of explosive detection, and discloses a carbon nanodot fluorescent waveguide and a preparation method and application thereof. The method comprises the following steps: (1) activating the waveguide; (2) treating the waveguide obtained in the step (1) with amino silane to obtain an amino-modified waveguide; (3) treating the amino-modified waveguide with acyl chloride to obtain an acyl chloride-modified waveguide; and (4) carrying out pretreatment on carbon nanodots, and loading the pretreated carbon nanodots onto the acyl chloride modified waveguide to obtain the carbon nanodot fluorescent waveguide. According to the carbon nanodot fluorescent waveguide prepared by the method disclosed by the invention, the carbon nanodots can be stably attached to the waveguide, and accurate detection of nitro explosives is realized.

This invention discloses the application of turmeric carbon nanodots in the control of wheat scab. The application of turmeric carbon nanodots in the control of wheat scab was carried out under natural light irradiation conditions. The turmeric carbon nanodots were prepared by a method comprising the following steps: 1) taking turmeric powder and drying it for later use; 2) subjecting the system of the turmeric powder and solvent to a hydrothermal reaction, centrifuging after the reaction, and collecting the supernatant; 3) purifying the supernatant and drying it to obtain the turmeric carbon nanodots. This invention uses the naturally occurring herbaceous plant turmeric as a precursor and combines it with carbon nanodot technology to prepare turmeric CDs. Turmeric is widely available and easy to obtain. The prepared turmeric CDs have excellent antibacterial ability against Fusarium graminearum spores and a good control effect on wheat scab, without adversely affecting the growth of wheat seedlings. It is expected to be an ideal agricultural green fungicide with great market application prospects.

This invention discloses carbon nanodots, their preparation method, and their applications, relating to the field of carbon nanomaterials technology. The carbon nanodots are prepared by solvothermal treatment of nicotinamide, urea, and citric acid or its derivatives. The citric acid derivative is selected from citrate, citric acid hydrate, or citrate hydrate. This invention synthesizes carbon nanodots using nicotinamide as a precursor under solvothermal treatment, simultaneously integrating intrinsic bioactivity, efficient photothermal conversion capability, and red fluorescence imaging function. This multifunctional synergistic therapy overcomes the limitations of single-therapy approaches. Furthermore, the carbon nanodots provided by this invention exhibit extremely high biocompatibility.

The application discloses a preparation method of an environment-friendly degradable single-side perspective sticker and belongs to the technical field of modified nanometer materials. The method comprises the following steps: (1) preparation of a multilayer composite structure: mixing polylactic acid and polybutylene succinate, adding nano-montmorillonite and a surface modifier to melt blend to form a first layer melt; stirring polybutylene adipate terephthalate and fluorescent carbon nanodots to form a second layer melt; and forming a film blank by co-extruding the first layer, a pressure-sensitive adhesive layer and the second layer; (2) construction of a nanometer film: biaxially stretching the film blank, pressing a micropore array, immersing in a silver nanoparticle suspension and drying to obtain a nanometer film; (3) functionalization treatment of a coating layer: immersing in a fluorine-containing nanometer coating solution and solidifying; and (4) post-treatment: secondary solidification. The obtained single-side perspective sticker is suitable for fields such as building and vehicle privacy films, and solves the problems of large pollution and slow degradation of traditional stickers.

The present application discloses a method for preparing pulp by dissociating straw fibers catalyzed by iron-manganese oxide cerium / carbon nanodots, the pulp and its application; the pulping method includes: S1: obtaining straw bundles by splitting straw; S2: dispersing iron-manganese oxide cerium / carbon nanodots in ethanol, adding water, then spraying the surface of the straw bundles, impregnating and catalyzing the reaction for 24 to 48 h to obtain dissociated straw products, adding sodium hydroxide, steaming at 120 to 160 °C for 15 to 30 min, and then performing straw homogenization treatment to obtain fibrillated fiber pulp; this method can effectively weaken the rigid strength of straw fiber polymers, enhance the bond breaking and plasticity of the macromolecular chains of straw fibers, reduce the energy consumption of mechanical disk milling and homogenization dissociation pulping of straw fibers, has high environmental safety, and the obtained pulp can be applied to the preparation of straw products such as straw substrate blocks, straw mulch films, straw seedling containers, and straw trays.

The invention provides a water-soluble soldering paste and a preparation method thereof, and belongs to the technical field of soldering pastes.The soldering paste is prepared from, by mass, 70-75% of alloy powder, 9-13% of conductive adhesive, 11-14% of scaling powder and 3-5% of other additives. The preparation method comprises the following steps: firstly, primarily mixing alloy powder and a conductive adhesive for 10 minutes, and then carrying out ball milling for 2.5 hours by using a ball mill at the rotating speed of 200rpm to obtain mixed powder; and the scaling powder and other additives are added into the mixed powder, stirring is conducted for 15 min through a stirring machine, then vacuum stirring is conducted for 20 min at the room temperature, bubbles in the materials are removed, and the water-soluble soldering paste is obtained. By adding the cobalt and the carbon nanodots, the wettability, the continuous printing stability, the welding spot mechanical strength and the thixotropic property of the water-soluble soldering paste are improved.

This invention discloses a carbon nanodot with H-aggregation properties, its preparation method, and its applications. Citric acid, p-phenylenediamine, and sodium hydroxide are dissolved in deionized water and stirred until fully dissolved to obtain a mixed solution A. Mixed solution A is then placed in a reaction vessel for a hydrothermal reaction to obtain product B. Finally, product B is naturally cooled and dialyzed to obtain carbon nanodots with H-aggregation properties. The carbon nanodots prepared by this invention are non-toxic, harmless, and can be stored for a long time. The fluorescence intensity and carrier lifetime can be controlled by concentration, making them suitable for photocatalysis.

This invention discloses a method for detecting nano-carbon dots, which can be used to detect nano-carbon particles or nano-carbon dots. The method includes: preparing a test solution containing nano-carbon dots and a detection substrate, wherein the substrate contains an active gold sol-gel based on SERS; mixing the test solution with the detection substrate to obtain a test sample; irradiating the detection substrate with a preset excitation light and acquiring the Raman spectrum fed back by the detection substrate to obtain a first control spectrum; and irradiating the test sample with the excitation light and acquiring the Raman spectrum fed back by the test sample to obtain an experimental spectrum; determining the components in the nano-carbon dots based on the first control spectrum and the experimental spectrum. This invention provides an effective and convenient means for detecting the components of nano-carbon dots.

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.

The invention belongs to the technical field of biological breeding, and particularly relates to a vegetable seed seedling cultivation method based on gene editing, which comprises the following steps: constructing a targeting nano delivery carrier loaded with gene editing ribonucleoprotein (RNP), the carrier is composed of surface modified polyethyleneimine and carbon nanodots of stem tip meristem homing peptide (MHP), and the carbon nanodots are uniformly distributed on the surface modified polyethyleneimine and the stem tip meristem homing peptide (MHP). RNP is delivered to stem tip meristem of a vegetable seedling through a micro-droplet in-situ permeation method, so that instantaneous editing of a target gene is realized, and homozygous editing seeds without exogenous gene residues are obtained through sexual reproduction. By means of the scheme, non-transgenic gene editing without genetic transformation and tissue culture is achieved, and the method has the advantages of being easy and convenient to operate, short in period, high in efficiency and wide in applicability and is suitable for character improvement of various vegetables such as tomatoes, spinach and cucumbers.

The invention provides an analysis reagent for quantitative analysis of hydrogen peroxide and preparation and use methods thereof, and the analysis reagent for quantitative analysis of hydrogen peroxide comprises a sludge protein-based carbon nanodot dispersion liquid, a BR buffer solution and a TMB solution, the sludge protein-based carbon nanodot dispersion liquid is prepared by the following steps: performing hydrothermal reaction on sludge-based protein extracted from activated sludge at 160-200 DEG C for at least 4 hours, centrifuging, and taking a product of which the molecular weight is not more than 500 Da from supernate. The analysis reagent provided by the invention takes activated sludge as a main raw material, can effectively promote hydrogen peroxide to generate hydroxyl radicals with high oxidation activity, further oxidizes TMB (Tetramethylbenzidine) to generate a blue product, and can directly, accurately and quantitatively analyze the concentration of hydrogen peroxide by utilizing the color change. Meanwhile, the invention also provides a feasible way for high-value utilization of the sludge protein.

The invention relates to the technical field of waterproof coiled materials, and discloses a carbon nanodot-based antibacterial waterproof coiled material and a preparation method thereof.The waterproof coiled material comprises a waterproof antibacterial functional layer, a bonding layer and a polyester non-woven fabric base material layer which are sequentially arranged from top to bottom; wherein the waterproof antibacterial functional layer is prepared from the following raw materials in parts by mass: 82 to 85 parts of SBS (Styrene Butadiene Styrene) modified asphalt, 1.2 to 1.8 parts of carbon nanodots, 1.0 to 1.5 parts of aminated nano zinc oxide, 2.5 to 3.0 parts of nano silicon dioxide, 0.3 to 0.5 part of silane coupling agent, 0.2 to 0.3 part of antioxidant, 0.3 to 0.5 part of dispersing agent, 0.1 to 0.2 part of mildew preventive and 7.0 to 10 parts of light calcium carbonate. According to the invention, not only can the antibacterial performance of the waterproof roll be improved, but also the good waterproof performance can be maintained, but also the tensile strength and wear resistance of the waterproof roll can be enhanced while the waterproof impermeability is improved.

Disclosed herein is a plurality of doped carbon nanodots, comprising: a plurality of carbon nanodots; and a dopant comprising from one or more of the group consisting of Si, Ce and Se, wherein the weight percentage of the dopant based on the weight of atomic Si, Ce and Se, relative to the total weight of the plurality of carbon nanodots is from 1.5 to 4 wt%. Also disclosed herein are a method of preparing a plurality of carbon nanodots, a method of enhancing plant stress resilience to an abiotic stressor, use of a plurality of doped carbon nanodots, and a fertilizer formulation comprising a plurality of doped carbon nanodots.

The invention discloses a negative ion antibacterial water-based paint for aquaculture and a preparation method thereof, and relates to the technical field of water-based paints.The negative ion antibacterial water-based paint is prepared, six-ring stone is added, and the six-ring stone can release negative ions and can play roles in sterilization and air purification. The quaternary ammonium modified chitosan is loaded on the hexacyclic stone, so that the antibacterial effect of the hexacyclic stone is further enhanced. According to the nitrogen-doped carbon nanodots prepared by the invention, ethylenediamine is used as a nitrogen source, and amino groups and acylamino groups are successfully inoculated to the surfaces of the carbon dots; the nitrogen-doped carbon nanodots are good in biocompatibility and low in toxicity, the nitrogen-doped carbon nanodots are compounded with the sophora flavescens polysaccharides, and the sophora flavescens polysaccharides are negatively charged and can interact with cation nutrient substances absorbed by bacteria, so that absorption of the bacteria to the nutrient substances is reduced, ion transport channel protein can be attacked, cells are dead, and the antibacterial effect is achieved.

The invention discloses a multifunctional nano material fluorescence-colorimetric dual-mode food-borne pathogenic bacterium detection and killing method and a system thereof. According to the method, a metal organic framework material (MIL-53 (Fe)) with nano-enzyme activity is used as a signal switch and a generator, carbon nanodots (CDs) of a fluorescence indication and photo-thermal sterilization unit are combined to form a basic platform, and masking of an aptamer on a nano-enzyme active site and competitive release under triggering of target bacteria are used as a core mechanism. A colorimetric and ratiometric fluorescence double-signal channel is activated to realize self-verification high-precision detection; cDs in the system are used as a photo-thermal element, and in-situ photo-thermal sterilization is realized after detection. The platform design that detection objects can be switched by replacing the aptamers shows good universality and application prospects, and a sensitive and efficient new strategy is provided for detection and elimination of food-borne pathogenic bacteria.

The invention relates to the technical field of nano antibacterial materials. The invention relates to a carbon nanodot, in particular to an all-weather broad-spectrum antibacterial antivirus carbon nanodot and a preparation method and application thereof. The preparation method of the all-weather broad-spectrum antibacterial antivirus carbon nanodots comprises the following steps: 1) adding an auxiliary solution into a high-molecular polymer to obtain a precursor solution; 2) transferring the precursor solution into a reactor, and reacting for 1-24 hours under the condition of 100-500 DEG C; and 3) after the reaction is finished, cooling to room temperature, collecting reaction liquid, and separating and purifying to obtain the carbon nanodots, wherein the high-molecular polymer is selected from a structure shown in the specification. The carbon nanodot can have an efficient killing effect on pathogenic microorganisms including but not limited to escherichia coli, staphylococcus aureus, candida albicans and other bacteria, fungi, influenza viruses and the like in all-weather environments such as sunny days, cloudy days, daytime and night, and meanwhile, the carbon nanodot prepared by the preparation method is high in biological safety and high in cost performance.

This invention relates to the field of luminescent materials technology, specifically to a method for preparing room-temperature solid-state phosphorescent stable dual-matrix carbon nanodots and their applications. The method uses dextrin, 3-aminopropyltriethoxysilane, and boric acid as raw materials. By simultaneously introducing a silicon matrix and a boron matrix to form a dual-matrix system, the method combines the excellent stability of the silicon matrix with the unique electronic modulation capabilities of boron. Room-temperature solid-state phosphorescent stable dual-matrix carbon nanodots are synthesized via a hydrothermal method. After three cycles of water immersion-drying, the phosphorescence intensity of the obtained dual-matrix carbon nanodots decreases by only 6% to 7%. The carbon nanodots synthesized by this method have broad application prospects in the fields of anti-counterfeiting and information encryption.

The invention belongs to the field of fluorescent carbon nanomaterials, and provides a near-infrared fluorescent carbon nanodot as well as a preparation method and application thereof. The carbon nanodot comprises a carbon-based core (having visible light and near-infrared light absorption and emission characteristics) prepared by taking a perylene compound or a nitrogen-doped perylene compound as a precursor; the carbon-based core is coated with the shell. The preparation method comprises the step of performing solvothermal reaction on the perylene compound or a mixture of the perylene compound and a nitrogen-containing compound. The invention also provides a tumor diagnosis and treatment integrated medicine comprising the carbon nanodot. Under the irradiation of visible light and near-infrared laser, the carbon nanodots can generate a large amount of active oxygen to kill tumor cells and generate a photothermal effect to assist in killing the tumor cells. The nitrogen element is doped, so that the absorption of the carbon nanodots on red light and NIR wave band light is improved, the emission, photo-thermal and photodynamic properties of the carbon nanodots in a near-infrared second region are promoted, and the treatment capacity of deep tumors is improved. And the carbon nanodots can be used for tumor and angiography in organisms.

The invention relates to the technical field of wood-plastic composite materials, and discloses a carbon nanodot antibacterial wood-plastic composite material and a preparation method thereof. The carbon nanodot antibacterial wood-plastic composite material is prepared from the following raw materials in parts by mass: 90 to 110 parts of matrix resin, 50 to 70 parts of wood filler, 30 to 50 parts of wood fiber powder treated by the carbon nanodot antibacterial composite material, 5 to 10 parts of nano zinc oxide, 3 to 6 parts of silver ion loaded mesoporous silica, 0.8 to 1.5 parts of modified graphene quantum dots and 2.5 to 4 parts of coupling agent, 4-7 parts of an interface compatilizer, 1.5-3 parts of a processing aid, 2.5-5 parts of an anti-aging aid and 12-20 parts of talcum powder. The core problems that a traditional wood-plastic composite material is poor in antibacterial property, insufficient in mechanical property, poor in environmental protection property and limited in stability are solved, multi-dimensional balance of long-acting antibacterial property, mechanical quality optimization, environmental protection standard reaching and use durability is achieved, and remarkable technical innovation and wide industrial application prospects are achieved.

The invention relates to the related technical field of wheat disease prevention and control, in particular to a preparation method and application of carbon nanodots for wheat disease prevention and control, semen cassiae is used as a precursor, ethyl alcohol is used as a reaction solvent, the semen cassiae and the ethyl alcohol are mixed according to the mass ratio of 1: 2-1: 10 to obtain a mixed precursor, then the mixed precursor is placed in a reaction kettle to be sealed, and the carbon nanodots are prepared at the heating temperature of 140-180 DEG C for 1-2 h. The preparation method comprises the following steps: adding carbon nanodots into a reaction kettle, reacting for 2-8 hours, filtering the reacted solution to remove reaction residues, reserving the solution, putting the solution into a drying box, drying at 60 DEG C to obtain powder, re-dispersing the dried powder by using deionized water, dialyzing by using a dialysis bag with the molecular weight of 500 for 12 hours, and freeze-drying a sample by using a freeze-drying machine to obtain the carbon nanodot powder capable of being used for preventing and treating wheat diseases. The carbon nanodots can effectively generate active oxygen under excitation of visible light, disease fungi can be killed through a photophysical process, generation of drug resistance can be reduced to the maximum extent, and the disease incidence rate of wheat in the field can be effectively reduced by spraying the carbon nanodot solution to wheat.