43 results about "Oleodaphnoic acid" patented technology

The invention discloses a rare earth perovskite quantum dot and a preparation method and application thereof in a solar cell, and belongs to the technical field of perovskite solar cells, and the preparation method comprises the following steps: mixing and stirring erbium salt and ammonium chloride in a solvent in a nitrogen atmosphere, after primary heating and heat preservation heating, adding an oleylamine solution, and continuing heat preservation heating to obtain a rare earth perovskite quantum dot solution; and adding a cesium oleate precursor after secondary temperature rise and heating to a specified temperature, immediately putting into an ice-water bath for cooling, centrifuging and washing the obtained product, and dissolving in chlorobenzene to obtain the rare earth perovskite quantum dot. The rare earth perovskite quantum dot provided by the invention is simple to prepare, is suitable for preparing various cell perovskite layers, and has good universality. Meanwhile, the solar cell provided by the invention has good stability and excellent commercial prospects.

The invention provides a metabolic marker for auxiliary diagnosis of schizophrenia, a construction method and application. Wherein the metabolic marker comprises lysophosphatidylcholine (LPC) (17: 0 / 0: 0), oleamide, lysophosphatidyl ethanolamine LysoPE (18: 0 / 0: 0), palmitamide, lysophosphatidyl ethanolamine LysoPE (0: 0 / 20: 4), lysophosphatidyl ethanolamine LysoPE (22: 6 / 0: 0), p-methylphenol sulfate, lactic acid, 3-hydroxybutyric acid, lysophosphatidyl ethanolamine LysoPE (18: 2 / 0: 0), lysophosphatidyl ethanolamine LysoPE (16: 0 / 0: 0) and sphingosine 1-phosphate. By utilizing the metabolic marker, auxiliary diagnosis of schizophrenia can be rapidly and accurately completed in the early stage of disease attack.

The invention discloses a preparation method of a copper-palladium alloy loaded nano titanium dioxide semiconductor material as a catalyst for a carbon dioxide reduction reaction. Firstly, alloy nanoparticles are generated through a sol-gel method, the morphology of the nanoparticles is controlled and agglomeration is prevented through oleylamine and oleic acid, and borane-tert-butylamine is added at the temperature of 170 DEG C to regulate and control the sizes of the generated alloy nanoparticles. A series of characterizations prove that the catalyst has a very good particle loading condition, uniform particle distribution and increased reaction active sites, and shows excellent activity when being applied to a carbon dioxide reduction reaction, when the loading capacities of copper and palladium are respectively 1%, the activity of the obtained catalyst is the highest, the methane generation rate can reach 20.23 mol / g / h, and the methane generation rate can reach 20.23 mol / g / h. The selectivity of methane reaches 100%.

The invention discloses an ultraviolet-assisted silicon-coated perovskite quantum dot and a preparation method thereof, and belongs to the technical field of nano materials, and the ultraviolet-assisted silicon-coated perovskite quantum dot is prepared from lead bromide, octadecene, oleic acid, oleylamine, silane and a cesium source through a series of operation steps. According to the ultraviolet-assisted silicon-coated perovskite quantum dot and the preparation method thereof, the required raw materials are simple, the reaction condition is mild, the reaction is rapid, the product generation efficiency is high, the prepared perovskite quantum dot is small in size, silicon coating is complete, the crystallinity is excellent, the fluorescence performance is excellent, and the stability is improved.

The invention belongs to the technical field of medical experimental animal models, and particularly relates to a construction method of a rabbit ear acne model for studying acne pathogenesis and drug curative effect. A healthy New Zealand large-ear white rabbit is selected, a testosterone solution is subcutaneously injected to induce endocrine disorder, oleic acid is smeared at an opening of an external auditory canal on the inner side of an ear, dermatobacterium acnes suspension is subcutaneously injected, and whether acne-like lesions such as erythema, papule and comedo appear on the skin of the ear or not is observed. The method is easy and convenient to operate, low in cost, good in repeatability, capable of simulating the pathological process of human acne and suitable for acne pathogenesis research and drug screening.

The present application relates to the technical field of detection, and relates to a preparation method of an oxygen-rich vacancy Mn3O4 nanoscale enzyme, and the method comprises the following steps: step one: adding KMnO4 into deionized water according to a ratio of 0.5-1.5 g:500 ml, and completely dissolving to obtain a mixed solution; step two: adding oleic acid according to a volume ratio of 1:50, and continuously stirring at 25-35 DEG C for 4-6 hours; step three: collecting the precipitate, washing with deionized water and ethanol alternately for 4-6 times, drying at 70-90 DEG C for 8-12 hours, and calcining at 180-220 DEG C for 4-6 hours, so as to obtain an oxygen-rich vacancy Mn3O4 nanoscale enzyme with oxidase activity; and the oxygen-rich vacancy Mn3O4 nanoscale enzyme can detect nitrite rapidly, sensitively and specifically.

The invention belongs to the field of X-ray long-afterglow luminescent materials. The technical problems that traditional Pr < 3 + > doped fluoride is insufficient in afterglow performance, X-ray imaging depends on continuous irradiation, and color scattering noisy points exist are solved. The NaLuF4: Mg / Cs / Pr fluoride material is prepared by adopting a Cs < + >-Mg < 2 + > co-doping regulation strategy, the material is synthesized by an oleic acid-octadecene liquid phase method, and the X-ray excitation afterglow intensity of Pr < 3 + > is improved by about 110 times by utilizing the synergistic effect that Cs < + > enhances X-ray absorption and Mg < 2 + > optimizes a carrier shallow-deep trap level; the material is prepared into the high-light-transmittance rare earth nano flexible scintillation screen with the resolution ratio of 20.01 lp / mm. According to the invention, zero-noisy-point time-delay imaging after low-dose X-ray transient irradiation is realized, continuous irradiation is not needed, the radiation dose is lower, and the method is mainly applied to the field of X-ray time-delay imaging of low-dose medical diagnosis and industrial nondestructive testing. The method does not need continuous X-ray irradiation, and has important application value in the fields of medical diagnosis, industrial nondestructive testing and the like.

This invention discloses a method for large-scale synthesis of pure red CsPbI3 quantum dots in air. Two strong ligands with phosphorus and oxygen functional groups replace the dynamically weakly bound oleic acid ligand as a protective layer for the quantum dots. The strong binding between the phosphorus and oxygen functional groups and lead ions reduces surface defects and water-oxygen erosion channels in the quantum dots, enabling quantum dot synthesis in air. Simultaneously, triphenylphosphine oxide with high steric hindrance is introduced to regulate the ripening process of the quantum dots to ensure high color purity. Furthermore, air synthesis allows for rapid mixing of large quantities of precursors, avoiding the numerous defects and performance degradation caused by uneven temperature and asynchronous nucleation and growth in large-scale synthesis. Through the dual-ligand strategy, gram-scale pure red quantum dots with a hundredfold scale-up retain more than 80% of the optical and electrical properties of small-scale synthesis, achieving a PLQY of 80.2% and a corresponding LED device efficiency of 13.29%, realizing the synthesis of high-performance large-scale quantum dots suitable for electroluminescence.

The present invention provides oligonucleotide and / or oligonucleotide analogue molecules which are antagonists of microRNAs, preferably of human microRNAs hsa-miR-23b-3p and hsa-miR-218-5p, which comprise a mixture of phosphorothioate and phosphodiester linkages, and which are conjugated to at least one oleic acid molecule. Inhibition of these microRNAs can increase the endogenous levels of the corresponding proteins MBNL1 and / or MBNL2. The present invention further provides compositions comprising said oligonucleotide and / or oligonucleotide analogue molecules and their use for the treatment and prevention of diabetes in a subject in need thereof.

The invention provides oligonucleotide and / or oligonucleotide analogue molecules that are antagonists of a microRNA, preferably antagonists of human microRNAs hsa-miR-23b-3p and hsa-miR-218-5p, that comprise a mixture of phosphorothioate and phosphodiester linkages, and that are conjugated to at least one oleic acid molecule. Inhibiting these microRNAs allows to increase the endogenous levels of the corresponding proteins MBNL1 and / or MBNL2. The present invention further provides compositions comprising said oligonucleotides and / or oligonucleotide analogue molecules and their uses for the treatment and prevention of DM in a subject in need thereof.

The application discloses molybdenum-doped nano zinc oxide with high visible light photocatalytic performance and a preparation method and application thereof. The molybdenum-doped nano zinc oxide is prepared from 1-octadecene, 1-dodecanol, oleic acid, a zinc source and a molybdenum source through vacuum degassing treatment, uniform stirring under a nitrogen atmosphere, heating to 100-140 DEG C, keeping warm until solid particles are dissolved, heating to 220-250 DEG C, keeping warm for 0.5-1 h of reaction, and cooling, washing and drying. The molybdenum-doped nano zinc oxide produces a local surface plasmon resonance absorption peak in the range of 600-700 nm through molybdenum ion doping, and the nano powder has a diameter of 5-20 nm; and the visible light photocatalytic performance of the zinc oxide material is greatly improved under the condition of visible light.

The invention provides a preparation method of thermally activated delayed fluorescence type ionic liquid and application of the thermally activated delayed fluorescence type ionic liquid in surface defect passivation of perovskite quantum dots, and the material is a novel material synthesized from a quaternized long alkyl chain material and TADF, and can be used for passivating the surface defects of the perovskite quantum dots. Perovskite quantum dots have become one of the most promising photoelectric materials. However, the oleic acid / oleylamine ligand is obviously separated from the surfaces of the PQDs due to reversible protonation and deprotonation processes, which mainly affects the photoelectric properties of the PQDs. The TADF material is a novel ionic TADF material, cesium and bromide ion vacancies can be passivated, so that the surface defect density is reduced, the stability is improved, and meanwhile, the luminescent brightness and the external quantum efficiency of perovskite can be improved. The invention provides an important thought for further optimizing the photoelectric property and application of the perovskite quantum dots.

The invention discloses a skin-sourced streptococcus infantis CCSM002 capable of improving skin health and a metagen of the streptococcus infantis CCSM002, and belongs to the field of microbial technologies and medicines. The streptococcus infantis CCSM002 provided by the invention has the capability of generating oleamide, D-erythrodisphingosine and (2-oxo-2, 3-dihydro-1H-indole-3-yl)-acetic acid, and the strain has a good effect of repairing a barrier function in the aspect of external use and a good application prospect, specifically, the activity of damaged HaCaT cells is improved in vitro, the activity of the damaged HaCaT cells is improved, the activity of the damaged HaCaT cells is improved, and the activity of the damaged HaCaT cells is improved. The expression of tissue kininolase is reduced, and the gene level expression of FLG, IVL, AQP3, ZO-1 and Occludin can be improved at the same time in the aspect of improving functional protein and structural protein after damage. Therefore, the streptococcus infantis CCSM002 has a huge application prospect in preparation of external daily chemical products or medicines for repairing the skin barrier.

The invention discloses a method for large-scale synthesis of pure red CsPbI3 quantum dots in air. Two strong ligands with phosphorus and oxygen functional groups are used for replacing dynamically and weakly combined oleic acid ligands to serve as a quantum dot protection layer, surface defects and water and oxygen erosion channels of quantum dots are reduced through strong combination between the phosphorus and oxygen functional groups and lead ions, and quantum dot synthesis in air is achieved; meanwhile, triphenylphosphine oxide with high chain steric hindrance is introduced to regulate and control the curing process of the quantum dots so as to ensure high color purity. In addition, a large number of precursors can be rapidly mixed during synthesis in the air, and a large number of defects and performance reduction caused by uneven temperature and different nucleation growth in large-scale synthesis are avoided. The gram-level pure red quantum dots amplified by hundreds of times can be obtained through a double-ligand strategy, optical and electrical properties of over 80% small-scale synthesis are reserved, the PLQY is 80.2%, the corresponding LED device efficiency is 13.29%, and synthesis of high-performance large-scale quantum dots for electroluminescence is achieved.

The application discloses a synthesis method of quantum dot photoresist, which adopts long-chain ligands of oleic acid and oleylamine, takes a polar solvent as a reaction solvent, adds lead halide and a cesium source as precursor substances, generates high-quality perovskite quantum dots in one step, then removes surface ligands of the perovskite quantum dots through reagents to form surface defects, makes the perovskite quantum dots have electronegativity, and then adds halide ligands capped with ammonium to combine with defects on the surface of the quantum dots to prepare the photoresist. The application not only improves the stability of the quantum dot photoresist, but also enhances the force between the quantum dots and the photosensitive ligands, thereby realizing controllable preparation of a high-precision quantum dot display array device, facilitating mass production, solving the complex process of multi-color conversion of a small display screen, and having a simpler process, higher stability, higher color purity and larger display color gamut compared with other existing products, and being helpful to promote Mini LED / Micro LED colorization application.

The invention provides a preparation method of zinc-doped perovskite quantum dots and application of the zinc-doped perovskite quantum dots in a photovoltaic film. The preparation method of the Zn-PQD comprises the following steps: dissolving cesium bromide, lead bromide and a zinc dopant in N, N-dimethylformamide, adding oleic acid and oleylamine, and stirring until the materials are completely dissolved to obtain a precursor solution; ethyl acetate is added into the precursor solution, and Zn-PQD is formed. The energy band gap of the PQD is regulated and controlled by doping Zn, visible light absorption is increased, the photon transition rate is increased, and the fluorescence efficiency and stability of the PQD are improved. According to the Zn-doped CsPbBr3 quantum dots, Pb is partially replaced by Zn, perovskite crystal lattices are gradually shrunk, a transition energy band is reduced, and the fluorescence efficiency is greatly improved. And the Zn-PQD / EVA film is obtained through compounding with the EVA, so that the stability of the Zn-PQD is improved, the light transmittance of the EVA is improved by improving light absorption, and the photoelectric conversion efficiency of the solar cell is improved.

A negative electrode active material and a preparation method therefore, and a related device are disclosed. The negative electrode active material comprises a negative electrode active substance and a coating layer. The coating layer is coated on the surface of the negative electrode active substance, and the coating layer comprises at least one of polymethyl methacrylate, sodium maleate, and oleic acid diethanolamide borate. The cycle performance and the initial coulombic efficiency of batteries are improved.

The invention discloses a preparation method and application of a RuFeCoNiMn high-entropy alloy nano-catalyst, the addition of CTAC promotes the formation of a nano high-entropy alloy material with a uniform size, and provides more catalytic active sites; the introduction of glucose also plays a key role in controlling the dispersion degree of the constructed RuFeCoNiMn, and meanwhile, the synergistic combination of Ru, Fe, Co, Ni and Mn and oleic acid amine play a key role in forming a uniform multi-component alloy nano-catalyst, and the prepared RuFeCoNiMn high-entropy alloy has a single face-centered cubic crystal structure. The content of each element accords with the entropy driving definition of the high-entropy alloy; alloy particles are uniform and narrow in size distribution, the average particle size is about 6.59 nm, the structural stability of the material can be improved, the electron transmission rate can be increased, oxygen desorption and release can be promoted, and therefore the electrocatalytic activity is effectively enhanced.

The invention discloses a benzisoselenazolone-statin bonding molecule as well as a preparation method and application of the benzisoselenazolone-statin bonding molecule. The bonding molecule is formed by chemically bonding a statin pharmacophore (3, 5-dihydroxyvaleric acid or a lactone structure thereof) and an ebbeselenium pharmacophore (benzisoselenazolone). The invention provides a plurality of synthesis paths including'first connection and then cyclization 'and'first parent nucleus construction and then coupling', and a plurality of specific compounds such as IA-6, IB-6, IIA-7, IIIB-5 and the like are efficiently prepared. In-vitro activity experiments show that the compounds can significantly reduce the content of triglyceride (TG) in hepatic cells induced by oleic acid and palmitic acid at the cellular level, the cytotoxicity is low, and the activity of part of the compounds is equivalent to that of atorvastatin. The invention provides a brand-new lead compound for developing a novel NASH treatment medicine with lipid-lowering and antioxidant / anti-inflammatory dual activities.

This invention discloses a trimetallic PdNiRu ultrathin nanosheet, its preparation method, and its applications. The nanosheet possesses ultrathin nanoscale dimensions, a two-dimensional sheet structure, and a multi-metallic composition. Using palladium(II), ruthenium(III), and nickel(II) acetylacetone as metal precursors, oleylamine and oleic acid as solvents, and carbon monoxide generated from the decomposition of the carbonyl compound Mo(CO)6 as a structure directing agent, the trimetallic PdNiRu nanosheet was synthesized via a one-step solvothermal method at 180°C for 3 hours. The highly curved ultrathin nanosheet structure and the ternary metal effect can synergistically regulate the surface electronic structure, helping to optimize the adsorption intensity of oxygen-containing species. It possesses advantages such as ultrathinness (~3.5 nm), good conductivity, high electrochemical activity, and good electrochemical stability. It can be used as an ethylene glycol oxidation anode catalyst and an oxygen reduction cathode catalyst, exhibiting high catalytic activity and stability in both applications.

The invention provides a preparation method of a two-dimensional perovskite and quantum dot lamination and an electroluminescent diode. The preparation method comprises the following steps: preparing a cesium source precursor by taking cesium stearate, oleic acid and 1-octadecene as raw materials; preparing a lead source precursor by taking lead halide, zinc halide, oleylamine, oleic acid and 1-octadecene as raw materials; thermally injecting the cesium source precursor into the lead source precursor and cooling to obtain a perovskite quantum dot solution; performing anti-solvent purification on the perovskite quantum dot solution to obtain perovskite quantum dots; phenylethyl amine iodide, lead halide and dimethyl sulfoxide are used as raw materials to prepare two-dimensional perovskite; and spin-coating the perovskite quantum dots on the two-dimensional perovskite to form a lamination of the two-dimensional perovskite and the quantum dots.

The utility model relates to the technical field of diethanolamine oleamide storage, in particular to a diethanolamine oleamide production and storage device which comprises a storage tank, a sealing cover, a moisture-proof detection mechanism and a moisture-proof detection mechanism used for detecting the connection moisture-proof performance of the storage tank and the sealing cover. The detection moisture-proof mechanism is arranged between the sealing cover and the storage tank, the detection moisture-proof mechanism comprises a sealing sleeve fixedly installed in the sealing cover, a detection assembly is arranged in the sealing sleeve, and a moisture-proof assembly is arranged at the bottom of the storage tank; when the storage tank is used, the storage tank can be lifted up by a certain distance from the ground through the moisture-proof assembly, the influence of ground moisture on the storage tank is reduced, when the storage tank is used, the sealing state of the sealing cover can be detected through the detection assembly, and when external moisture invades, a worker can be timely displayed and warned to conduct inspection; therefore, the storage loss of the diethanolamine oleamide is reduced.

The invention provides a colloidal atomic layer deposition method for a wurtzite Zn-based nanosheet non-polar surface, and belongs to the technical field of chemical engineering. The zinc oleate ligand exchanges the original oleylamine ligand, the zinc oleate is deposited on a non-polar surface to form a Zn < 2 + >-rich polar surface, and then anion deposition is performed, so that epitaxial growth of a homogeneous or heterogeneous material in the thickness direction of the oil-soluble Zn-based nanosheet is realized, and the thickness of the Zn-based nanosheet is increased or a core-shell structure is constructed. The optical property of the Zn-based nanosheet is regulated and controlled by increasing the thickness and constructing the core-shell structure. According to the method, the problem that epitaxial growth in the thickness direction is difficult to realize on the non-polar surface of the nanosheet in the traditional colloid atomic layer deposition is solved.

The invention discloses a nano material with a depolymerization effect on phosphorylated Tau protein as well as a preparation method and application of the nano material. Rare earth fluoride NaYF4 is used as an inner core, rare earth nanoparticles are synthesized in an oleic acid and octadecene system by adopting a liquid phase epitaxial growth technology, and the rare earth nanoparticles are connected with a photosensitizer through covalent binding after water conversion to form the nano material with a depolymerization effect on phosphorylated Tau protein. The nano material can generate a large amount of ROS under irradiation of near-infrared light 808 nm laser and inhibit Tau protein aggregation on the cellular level, and can be applied to preparation of drugs for degrading inactivated phosphorylated Tau protein.

The application relates to the technical field of nanocrystal materials, and discloses a preparation method and application of Ag8SnSe6 nanocrystals. The preparation method of the Ag8SnSe6 nanocrystals comprises the following steps: Se, oleylamine and dodecanethiol are added into a container one for ultrasonic treatment to obtain a Se precursor; AgNO3, SnCl4.5H2O, Se, oleylamine and oleic acid are added into a container two, vacuum pumping is carried out for primary stirring, then the temperature is increased to 80 DEG C, vacuum pumping is carried out again for secondary stirring, the material structure is low-dimensioned, so that the freedom of decoupling electric heat transport is increased; the quantum confinement effect of the nanomaterials is utilized to increase the state density of the Fermi surface, so that the Seebeck coefficient of the material is significantly enhanced, and a higher power factor is obtained; meanwhile, the nanocrystallization of the material also produces the dimension and size limitation effect and the interface scattering effect on the phonon transmission, so that the thermal conductivity is reduced; therefore, the low-dimensioning of the material structure effectively improves the thermoelectric performance.

The invention discloses a small molecule peptide, the amino acid sequence of the small molecule peptide is Leu-Met-Pro-Phe (LMPF), the molecular weight of the small molecule peptide is 506.653 Da, the small molecule peptide has Pancreatic lipase PL inhibition activity, the inhibition rate of the small molecule peptide is 66.55%, the accumulation of the content of triglyceride (TG) in oleic acid induced human liver cancer (HepG2) cells can be reduced, and the small molecule peptide can be used for preparing a medicine for treating liver cancer. The small molecule peptide can be applied to preparation of preparations for treating or assisting in treating hyperlipidemia and obese people, and has the characteristics of simplicity in preparation and suitability for industrial production and market popularization and application.

The invention belongs to the technical field of biological catalysis and enzyme engineering, and particularly relates to a preparation method of covalent immobilized lipase based on amino functionalization MOF (Metal Organic Framework) and application of the covalent immobilized lipase in synthesis of diglyceride. The invention discloses a method for cross-linking and immobilizing CALB lipase on a zirconium-based metal organic framework NH2-UiO-66 by adopting glutaraldehyde as a cross-linking agent, the obtained immobilized lipase is defined as CALB-coated GA-NH2-UiO-66, and the immobilized lipase is applied to catalytic esterification synthesis of diglyceride. The oleic acid conversion rate is determined by adopting an acid value, and the composition of a product is analyzed by HPLC-ELSD. The immobilized lipase CALB (at) GA-NH2-UiO-66 disclosed by the invention has the advantages of high stability, reusability, high catalytic efficiency and diglyceride selectivity. The high DAG production significantly mitigates downstream purge burden. A promising solution is provided for industrial production of DAG, and a deep insight is provided for a fixing mechanism of a functionalized metal-organic framework.

The invention belongs to the technical field of traditional Chinese medicines, and provides a pharmaceutical composition for cervical and vaginal lesions as well as a preparation method and application of the pharmaceutical composition. The pharmaceutical composition is prepared from the following components in parts by weight: 0.01 to 1 part of astilbin, 7.5 to 30 parts of radix sophorae flavescentis, 10 to 35 parts of herba houttuyniae, 7.5 to 30 parts of honeycomb, 6 to 24 parts of dysosma versipellis, 8 to 24 parts of fructus cnidii and 2.5 to 5 parts of oleic acid. The pharmaceutical composition disclosed by the invention has a prominent treatment effect on vagina or cervical lesions, especially vaginitis and vagina and cervical squamous intraepithelial neoplasia caused by HPV (Human Papilloma Virus).

The invention relates to the technical field of photoelectric materials, particularly discloses a method for improving the stability of perovskite quantum dots through ligand exchange, realizes direct mixing of the perovskite quantum dots and commercial photoresist AZ5214 and simple and efficient patterning, and overcomes the compatibility problem. According to the method, a new ligand n-dodecanethiol is introduced into the CsPbBrI2 quantum dot, and the mercaptan ligand can be bonded to the surface by forming an S-Pb bond to replace a part of original oleic acid and oleylamine ligands, so that the optical performance and the stability of the CsPbBrI2 quantum dot are remarkably improved. After the CsPbBrI2 quantum dots are directly mixed with photoresist, the CsPbBrI2 quantum dots can be prepared through a photoetching process. The quantum dots still maintain excellent luminescence performance in the coating of the photoresist, and can be applied to a color conversion layer of a display.

The application discloses a preparation method of a perovskite nanocrystal photocatalyst with adjustable surface ligand length, and comprises the following steps: S1, preparing an oleylamine surface ligand and a lead bromide precursor solution; S2, preparing an oleic acid surface ligand and a cesium carbonate precursor solution; S3, rapidly injecting the cesium carbonate precursor solution into the oleylamine surface ligand and the lead bromide precursor solution to react, and cooling in an ice bath; S4, exchanging different length ligands with original ligands to adjust the length of the surface ligand of the catalyst; and S5, repeatedly washing the surface excess ligand through toluene and acetone, and then drying to obtain the photocatalyst. The photocatalytic reduction of carbon dioxide of the CsPbBr3 perovskite nanocrystal photocatalyst with the disclosed surface ligand with a 6-carbon chain length is 5.58 times that of the CsPbBr3 perovskite nanocrystal photocatalyst with the original surface ligand, and the activity of the CsPbBr3 perovskite nanocrystal photocatalyst is greatly improved.