43 results about "Gold salts" patented technology

The invention discloses a preparation method and application of composite nanoparticles with a gold-silver core-shell structure, and aims to solve the problems that silver halide precipitates are generated on the surface of a silver core and the silver core is etched in the prior art. The thiourea solution is used for replacing a halogen-containing reagent, uniform epitaxial growth of gold on the surface of the silver core is mildly achieved, the gold-shell silver-core nanoparticles which are evenly wrapped and stable in structure are prepared, and the gold-shell silver-core nanoparticles are suitable for the fields of immunodetection and the like and are good in color development effect and low in cost. The method comprises the steps of preparing a gold salt solution, preparing gold nano-seeds, preparing silver nano-cores and generating gold-shell silver-core nano-particles through a chemical reduction reaction, and the problem that a core-shell structure grows unevenly is solved. When the method is applied to immunodetection, the material cost can be remarkably reduced, and a better color development effect can be achieved.

The invention provides electroplating liquid, an electroplating method, an alloy bump and a preparation method of the alloy bump. The electroplating solution comprises the following components with mass concentration: 5-20 g / L of water-soluble cyanogen-containing gold salt, 1-15 g / L of water-soluble silver-containing salt, 0.5-5 g / L of cobalt citrate, 1-10 g / L of a refiner, 20-100 g / L of conductive salt, 10-90 g / L of a compound complexing agent and the balance of deionized water. The refining agent is selected from one or more of sodium lignin sulfonate, 5-nitroguaiacol sodium salt, sodium carboxymethyl cellulose and sodium alginate. Cobalt citrate and a specific substance are selected as refiners, so that the prepared gold-silver alloy bump is high in hardness and low in surface roughness; and through matching of the complexing agent, the antioxidant and the stabilizer, the oxidation resistance and the stability of the electroplating liquid are greatly improved, and the service life is prolonged.

The present invention provides a homocysteine ​​electrochemical sensor, and its preparation method and application. The preparation method of the homocysteine ​​electrochemical sensor of the present invention comprises the following steps: adding a dispersion containing carbon nanomaterials to the surface of a glassy carbon electrode, baking and drying, to obtain a carbon nanomaterial-modified electrode; then placing the carbon nanomaterial-modified electrode in a gold salt aqueous solution, and using an electroplating method to deposit nanogold on the surface of the carbon nanomaterial-modified electrode, to obtain a homocysteine ​​electrochemical sensor; the high conductivity of gold nanoparticles is of great significance for improving the electrocatalytic performance of the composite material for homocysteine. The homocysteine ​​electrochemical sensor prepared by the present application has low cost, low detection limit, and good stability. In addition, the spiked recovery rate of homocysteine ​​in serum samples is good, which provides potential application value for the reliable determination of homocysteine ​​in biological systems and the study of homocysteine-related diseases.

The present invention provides a gold plating method, a gold plating composition, and a plating solution that realize soft gold plating. The gold plating method is carried out using a plating solution that contains gold sulfite and at least one of thiosulfate ions and trithionate ions.

The invention relates to preparation and application of a nano material for targeting and enhancing nervous tumor ferroptosis, and belongs to the field of medicines. The nano-scale polypeptide-gold complex cluster NG formed by gold and sulfydryl-containing targeting polypeptide is characterized in that NG molecules form AuxPy, x is equal to 1-35, y is equal to 1-30, and P is corresponding nervous system tumor targeting polypeptide, preferably Au17P7. The preparation method comprises the following steps: mixing a gold salt solution with nervous system tumor targeting polypeptide to form a mixed solution, and adding a reducing agent under certain temperature and pH conditions, so that Au interacts with a sulfydryl phase of the polypeptide to form the complex cluster NG. The compound is used for preparing a targeted drug for improving the tumor treatment effect of the ferroptosis inducer, and has a specific synergistic treatment effect on nervous system tumors when being used together with the ferroptosis inducer.

The invention relates to the technical field of electroplating, and particularly discloses a cyanide-free gold electroplating solution as well as a preparation method and application thereof. The cyanide-free electrogilding plating solution comprises soluble gold salt, a first complexing agent, a second complexing agent, a buffering agent, a brightening agent, a wetting agent, a titanium ion chelating agent, an antioxidant, conducting salt and the balance deionized water. The first complexing agent is ethylene diamine tetraacetic acid disodium salt; the preparation raw materials of the second complexing agent comprise an aza-macrocyclic complex and sodium hydroxide, and the mass ratio of the aza-macrocyclic complex to the sodium hydroxide is 1: (1-2). The stability of the plating solution can be improved, and a plating layer with fine crystal nucleus and a compact structure can be formed, so that the protection performance and the appearance of the plating layer are improved.

The disclosed subject matter relates to gold particles, and methods of making and use thereof. For example, disclosed herein are one-step ligand exchange methods. The methods comprise contacting a gold particle capped with a toxic ligand with a less-toxic ligand in a solution, wherein the concentration of the less-toxic ligand and / or the pH is sufficient to cause the toxic ligand to be replaced by the less-toxic ligand. In some examples, the methods comprise contacting a gold particle capped with a toxic ligand with a gold salt and a less-toxic ligand in a solution, wherein the less-toxic ligand is a reducing agent for the gold salt, such that the gold salt is reduced and deposited as a thin layer of gold onto the gold particle, wherein the concentration of the less-toxic ligand is sufficient to cause the toxic ligand to be replaced by the less-toxic

The invention discloses a synthesis method and a use method of large-particle gold-silver core-shell structure composite nanoparticles. According to the method, an acetic acid-chlorine-gold compound solution is prepared through the steps of dissolving, concentrating, crystallizing, washing and the like, and a pure gold salt solution without halogen is obtained, so that halogenated precipitates are prevented from being generated on the surface of a silver core. Meanwhile, ascorbic acid is adopted as a reducing agent to control the reaction to be mild, and the gold-shell silver-core nanoparticles which are stable in structure and uniform in coating are obtained. According to the method, the composite nanoparticles which are high in purity and firm in wrapping are provided, the method is suitable for the fields of immunodetection, surface enhanced Raman scattering and the like, the material cost is effectively reduced, and the detection effect is improved.

The invention discloses preparation and application of a gold cluster compound for targeted therapy of acute kidney injury diseases, and relates to the field of nephropathy treatment medicines. The molecular composition (Au) is x (S) y, x is equal to 3-144, y is equal to 1-140, and S is a sulfydryl-containing renal injury target protein binding peptide or a sulfydryl-modified renal injury target protein binding peptide. The method comprises the following steps: mixing a gold salt solution with a sulfydryl-containing ligand to form a mixed solution; under the conditions of certain temperature and pH, the mixed solution system is subjected to a reduction reaction, high-valence Au ions in the gold salt are reduced into Au atoms or monovalent Au ions, and Au forms a gold cluster compound through physical or chemical interaction; the cluster compound disclosed by the invention has remarkable treatment activity in a cis-platinum induced acute kidney injury model, and the acute kidney injury is treated in a targeted manner by inhibiting over transcription and expression of pro-inflammatory cytokines and removing reactive oxygen species (ROS).

The invention discloses a cyanide-free Au-Sn electroplating solution and application, and belongs to the technical field of electroplating, the electroplating solution is composed of a gold source, a tin source, a gold complexing agent, a tin complexing agent, an additive and a pH buffering agent; the gold source is gold mercaptosulfonate; the tin complexing agent is mercaptoacetic acid and salt thereof; and the pH value of the cyanide-free Au-Sn electroplating solution is 3 to 11. The electroplating liquid provided by the invention does not contain extremely toxic substances, has relatively high storage stability and electroplating stability, and still keeps a clear and transparent state even under high and low temperature change, illumination, long-time storage or long-time electroplating, and an Au-Sn alloy plated part with uniform and stable components and high reproducibility is obtained in long-time storage or long-time electroplating; therefore, the performance of an Au-Sn alloy plating piece obtained through electroplating is effectively guaranteed, the performance of the electroplating solution is excellent, and application to the packaging technology of microelectronic or optoelectronic devices is facilitated.

The invention relates to the technical field of surface treatment, and discloses a gold plating solution, a preparation method thereof and an electroplating process. According to the total volume of the gold plating solution, the gold plating solution comprises the following components by concentration: 1-20 g / L of gold salt; 100 to 230 g / L of citrate; 20 to 50g / L of oxalate; 0.5-5 g / L of a transition metal additive; 4-10 g / L of an antioxidant; 1-5 g / L of a surfactant; wherein the pH value of the gold plating solution is 4-4.8, and the specific gravity of the gold plating solution is 10-15; the citrate comprises potassium citrate and citric acid; the transition metal additive is selected from at least one of cobalt salt, nickel salt and ferric salt. The preparation method is simple, and the prepared gold plating solution is used for the steps of base material pretreatment, electroplating treatment and aftertreatment in the electroplating process, so that the prepared gold plating product has excellent binding force, wear resistance, corrosion resistance and the like.

A cancer therapeutic agent includes a caffeic acid or cadambine phytochemicals cocktail on surfaces of gold nanoparticles. The agent can include a caffeic acid and cadambine phytochemicals cocktail on the surfaces of the gold nanoparticles. The surfaces are preferably stabilized with gum Arabic. The surfaces can consist of caffeic acid stabilized with gum Arabic, cadambine stabilized with gum Arabic, or caffeic acid and cadambine stabilized with gum Arabic. A method of forming the agents uses electrons of caffeic acid and / or cadambine to reduce gold salt(s) to gold nanoparticles without the use of any external toxic chemical reducing agents.

The present invention provides a method for preparing a palladium-gold solid solution, comprising the following steps: S1) Mixing a palladium salt and a gold salt in water to obtain a first mixed solution; mixing an organic monomer and water to obtain a second mixed solution; S2) Adding an organic buffer to the first mixed solution, adjusting the pH value to alkaline, then adding the second mixed solution, and continuously stirring to obtain a precursor; S3) Annealing the precursor in a protective atmosphere to obtain a palladium-gold solid solution. Compared with the prior art, the present invention uses an organic monomer to polymerize and coat palladium-gold ion clusters under alkaline conditions, and a palladium-gold solid solution can be obtained after annealing treatment, providing the uniformity of the gold phase structure distribution in the solid solution. As a catalyst, it has high electrocatalytic oxygen reduction activity, and this preparation method is safe and easy to implement, without generating additional toxic by-products, and the required equipment is simple. It is a method for large-scale preparation of palladium-gold solid solution catalysts.

A process for preparing a catalyst for the oxidative esterification of methacrolein to methyl methacrylate includes providing a support selected from an oxide of silicon, a carbide of silicon, a metal oxide, and a metal carbide. Particles of at least one oxide of a metal are provided on the support. The support is contacted with a gold salt and heated at a temperature ranging from 50°C to 600°C for a time ranging from at least 0.1 hours to 48 hours to convert the gold salt into gold nanoparticles having an average diameter of less than 12 nm and a standard deviation of + / - 4 nm, with at least 75% by number of the gold nanoparticles located within 20 nm of the metal oxide particle.

The present application relates to a preparation method of gold-plated nickel powder, which provides a fourth mixed solution formed by mixing a gold salt, a weak acid solution and a volatile prevention additive or formed by mixing a cyanide-free gold salt and a weak acid solution, and adds the fourth nickel powder after oil removal by an alkaline solution, pickling and surface activation treatment into the fourth mixed solution to form a fifth mixed solution; the fifth mixed solution is subjected to warming and ultrasonic stirring, and the fifth mixed solution after warming and ultrasonic stirring is subjected to filtration separation to obtain the fifth nickel powder containing gold on the surface; the fifth nickel powder containing gold on the surface is subjected to cleaning and drying to obtain the gold-plated nickel powder. The present application adopts the method of adding a volatile prevention additive or using a cyanide-free gold salt for gold plating, which can effectively inhibit the volatilization of cyanide and is environmentally friendly and safe.

This invention discloses a composite stabilizer for stabilizing volatile heavy metals in the digestion of excess activated sludge and its application method, belonging to the field of environmental monitoring and chemical analysis technology. Addressing the problem that excess sludge from metallurgical wastewater treatment is complex in composition and subject to severe interference, especially the easy loss of volatile elements such as mercury, arsenic, selenium, and antimony during traditional digestion and pretreatment processes, leading to low detection results, this invention provides a solution for stabilizing volatile heavy metals in the digestion of excess activated sludge, enabling accurate detection of these elements. The composite stabilizer efficiently complexes and stabilizes multiple volatile heavy metal elements, overcoming the problems of narrow stability range and high cost associated with single stabilizers (such as gold salts). The combination of L-cysteine ​​and trace amounts of gold salt reduces costs and improves stabilization effect. The use of a low-concentration nitric acid medium avoids interference from chloride ions in hydrochloric acid on arsenic, facilitating accurate detection by mass spectrometry.

The invention relates to a cyanide-free chemical displacement gold plating solution and a gold plating method, which are particularly suitable for deposition of an ultrathin gold layer (less than or equal to 0.1 mu m) on the surface of a nickel base material. The gold plating solution comprises a buffering agent, gold salt and a double-complexing-agent system composed of L-glutamine and 2-furancarboxylic acid. Amido and amino of L-glutamine synergistically act on the surface of nickel, so that mild activation is realized; furan epoxy atoms in 2-furancarboxylic acid and carboxyl form a steric-hindrance effect, so that gold ion release kinetics is regulated and controlled, and excessive substitution reaction is inhibited. The two synergistically solve the problems of unstable gold plating liquid, uneven coverage and the like in replacement gold plating on the nickel layer, and the obtained gold layer is compact and non-porous, and the gold plating liquid is stable. The process is environment-friendly and is suitable for high-reliability gold plating of the microelectronic packaging nickel substrate.

This invention relates to the field of electroplating technology, and discloses an electroplating gold solution, its preparation method, and its application. The electroplating gold solution, by concentration, comprises the following components: 3-15 g / L gold salt, 30-100 mg / L accelerator, 10-20 g / L complexing agent, 15-50 mg / L stabilizer, 10-50 mg / L inhibitor, 30-70 mg / L dispersant, and 10-20 g / L conductive salt; the solvent of the electroplating gold solution is water; the accelerator includes 3-amino-6-methylpyridazine. The electroplating gold solution provided by this invention, using 3-amino-6-methylpyridazine as an accelerator, can promote gold ion precipitation and improve electroplating efficiency; the electroplating gold solution does not use cyanide-containing raw materials, thus having good environmental friendliness; the electroplating gold solution has good stability and a low scrap rate, which helps to save costs; the composition and working parameters of the electroplating gold solution are reasonable, and it can form a uniform, bright coating without plating cracks, and can be applied to the electroplating gold surface treatment of ceramic substrates.

The application discloses a kind of for methanol and methyl methacrolein oxidation esterification catalyst and its preparation method and application, belong to catalytic synthesis technical field.The application first prepares silicon-titanium molecular sieve TS-1 carrier, then loads gold nanoparticles, and gold-based catalyst is prepared, TS-1 carrier can not only stabilize gold salt, Ti-O-Au bond can be formed between titanium species in TS-1 carrier and gold nanoparticles, improve the interaction between gold metal and carrier, more effectively limit the size of gold particle, form smaller size nano gold particle and good dispersity, improve the specific surface area of catalyst, to improve catalyst activity and stability.Mass concentration is 45-80% methanol and methyl methacrolein mixed solution and the obtained catalyst are mixed sufficiently, oxygen is input, and oxidation esterification reaction occurs under 70-160 DEG C, 0.5-2MPa, to prepare methyl methacrylate.The gold-based catalyst prepared by the application significantly improves the conversion rate of methyl methacrolein and the selectivity of methyl methacrylate.

The utility model provides a kind of gold salt recovery pollution prevention and control device, comprising: rack, lifting frame, gas injection module, PCB workpiece and gold sink tank;The lifting frame is located in the inside upper side of the rack, the PCB workpiece is located at the bottom of the lifting frame, the gold sink tank is located directly below the PCB workpiece;The gas injection module is fixedly arranged in the inside of rack by the mounting bracket of its two sides, the gas injection module is located between the lifting frame and PCB workpiece, and is located directly above the PCB workpiece;Further comprising a blower, the blower is located in the outside of the rack, the blower is connected with the gas injection module by air supply hose;The utility model solves the problem of waste and pollution caused by gold water spatter to the outside, and the problem of gold salt concentration control disorder caused by the water of spray.

This invention discloses a gold nanoparticle, its preparation method, and its application, relating to the field of biomaterials technology. The gold nanoparticle is prepared by a method comprising the following steps: preparing a first mixed solution containing a gold salt, a ligand, and a stabilizer; performing a first reaction to obtain a reaction solution; preparing a second mixed solution containing a reducing agent and the reaction solution; and performing a second reaction to obtain the gold nanoparticle. The ligand has the structure shown in the following general formula: R1 is selected from Cl, Br, C1-C4 alkane groups or hydroxyl groups; R2 is selected from Cl, Br, C1-C4 alkane groups or hydroxyl groups. The prepared gold nanoparticle exhibits good biocompatibility and antibacterial properties, demonstrating significant social, economic, and technological benefits, as well as high practical application value and promising prospects for wider application.

The invention belongs to the technical field of biology, and relates to a colorimetric probe for detecting myoglobin and a detection method. The colorimetric probe comprises a reagent A and a reagent B: a solution containing iodide ions; the preparation method of the reagent A comprises the following steps: adding a reducing agent into a solution containing a copper salt and a coordination stabilizer, stirring, adding a water-soluble gold salt or gold acid when the solution turns from red to green, and continuously stirring for 1-100 minutes to obtain a copper-gold nanoparticle solution; the thioacetamide is subjected to a hydrolysis reaction in an acid solution to generate hydrogen sulfide, then the copper-gold nanoparticle solution obtained in the step S1 is added for a reaction, and a hydrogen sulfide modified copper-gold nanoparticle solution is obtained. Through a coupling mechanism of acidic H2S in-situ release-Au-S bond binding-I-etching, nanomole-level, high-selectivity and label-free colorimetric detection of myoglobin is realized, and the method has sensitivity, reliability, economical efficiency and field applicability, and can be widely applied to rapid screening.

The invention discloses application of a gold nanocluster for enhancing breast cancer endoplasmic reticulum stress death, and relates to the field of triple negative breast cancer treatment. A proper gold salt solution and natural peptide / protein are fully stirred according to the explored temperature and pH conditions, at the moment, high-valence Au ions in the gold salt are reduced, and the luminescent characteristic is shown. As a docetaxel enhancer, the nanocluster disclosed by the invention can effectively promote endoplasmic reticulum stress death of breast cancer cells and inhibit tumor cell activity; due to good biological safety and stability, effective treatment of breast cancer can be realized. The compound can be used for treating various breast cancers represented by triple-negative breast cancers.

This invention relates to the preparation of albumin-based gold clusters and their application in the treatment of inflammatory bowel disease (IBD), belonging to the pharmaceutical field. The method uses thiol-containing albumin as a template, mixes it with a trivalent gold salt compound under alkaline conditions, and irradiates it in a microwave reactor at 40–70°C for 1–5 cycles, each cycle lasting 1–10 minutes. This allows for the rapid synthesis of hydrated gold clusters with a particle size less than 20 nm and excellent fluorescence properties without the need for an external reducing agent. This method offers advantages such as rapid reaction speed, high yield, and good batch stability, overcoming the problems of long reaction time, low efficiency, and non-uniform products associated with traditional hydrothermal methods. The obtained albumin-gold clusters exhibit good biocompatibility and targeting properties, effectively accumulating at sites of intestinal inflammation after oral or injectable administration, achieving targeted therapy for IBD and providing a novel drug solution for the clinical treatment of IBD.

The invention discloses a micron-sized spherical gold powder and a preparation method and application thereof, belonging to the technical field of metal powders. The invention adopts a two-step method to synthesize the gold powder. In the first step, a gold salt solution is adjusted to pH 7-9 and 3-5, and the mixture is mixed with a dispersant solution and a reducing agent solution to obtain a precursor solution. In the second step, the precursor solution is mixed with the gold salt solution, the pH is adjusted to 3-5, and the mixture is mixed with a dispersant solution and a reducing agent solution to obtain the micron-sized spherical gold powder. The gold powder has a suitable particle size, a spherical surface morphology, a uniform particle size distribution, a good dispersion, and no agglomeration. The gold powder is applied to the preparation of a conductive slurry, and the performance of the conductive slurry can be effectively improved.

The present invention discloses a cyanide-free Au-Sn electroplating solution and its application, belonging to the field of electroplating technology. The electroplating solution is composed of a gold source, a tin source, a gold complexing agent, a tin complexing agent, an additive, and a pH buffer. The gold source is a gold salt of mercapto sulfonic acid, and the tin complexing agent is mercaptoacetic acid and its salts. The pH of the cyanide-free Au-Sn electroplating solution is 3-11. The electroplating solution provided by the present invention does not contain highly toxic substances, has high storage stability and electroplating stability, and remains clear and transparent even after high and low temperature changes, light exposure, long-term storage, or long-term electroplating. A Au-Sn alloy plating with uniform and stable composition and high reproducibility can be obtained during long-term storage or long-term electroplating, thus effectively ensuring the performance of the Au-Sn alloy plating obtained by electroplating. The electroplating solution has excellent performance and is conducive to application in the packaging technology of microelectronic or optoelectronic devices.

The invention provides a gold salt, a purification method of the gold salt, a cyanide-free electroplating solution and a preparation method and a use method of the cyanide-free electroplating solution. The cyanide-free electroplating solution mainly comprises the gold salt purified through the purification method in the embodiment of the invention and conductive salt. According to the purification method in the embodiment of the invention, firstly, sodium gold mercaptosuccinate with the gold content of 35-49.51 w / % is dissolved in hot pure water at the temperature of 60-80 DEG C, and a sodium gold mercaptosuccinate solution is obtained; dropwise adding the gold sodium mercaptosuccinate solution into a water-insoluble weak-polarity organic solvent to obtain a mixed solution; stirring the mixed solution, and purifying the mixed solution after stirring to obtain purified gold salt; the gold content of the gold salt is 55.01-56.9 w / %, the total impurity content is less than 0.01%, and the single impurity content is less than 5PPM. The gold salt obtained through the purification method is high in gold content and low in impurity content, the electroplating liquid prepared by taking the gold salt as the cyanide-free electroplating raw material is high in stability and long in service life, and the obtained gold-plated layer is good in quality.

The application discloses a method for recovering gold from a leaching solution containing a gold thiothiosulfate salt, comprising the following steps: (1) mixing gold-containing raw materials with a leaching solution, and performing solid-liquid separation after uniform mixing to obtain a leaching solution containing a gold thiothiosulfate salt; (2) mixing polyionic liquid with the leaching solution containing the gold thiothiosulfate salt to obtain a mixed solution, and performing solid-liquid separation after sufficient mixing until the polyionic liquid adsorption is completed, so as to obtain polyionic liquid adsorbed with gold; and (3) immersing the polyionic liquid adsorbed with gold into an acidic thiourea solution, and obtaining soluble gold salt after desorption; the structural formula of the polyionic liquid is shown in the following formula (I)-(IV); and the method disclosed by the application uses a plurality of polyionic liquids with special structures as adsorbents, and realizes efficient separation and recovery of gold from a gold thiothiosulfate salt system. (I); (II); (III); (IV).

The invention belongs to the field of chemical plating, and particularly discloses a chemical reduction gold plating solution. The chemical reduction gold plating solution comprises, by mass concentration, 2-6 g / L of gold salt, 0.02-0.08 g / L of a stabilizer, 5-10 g / L of a complexing agent, 2-8 g / L of a reducing agent, 1-4 g / L of a homogenizing agent and 0.06-0.12 g / L of a composite inhibitor. The composite inhibitor is prepared from pentaethylene glycol dimethyl sulfonate and beta-alanine benzyl ester p-toluenesulfonate. The chemical reduction gold plating solution has excellent gold cylinder stability, the solution is still clear and free of sediment after being used for 8 months, and a gold plating layer prepared through the chemical reduction gold plating solution is bright, free of color difference and gold bumps on the surface, compact and flat in surface, free of folding plating cracks and small in thickness range; and the use requirements of gold plating of high-precision electronic devices can be met.

The invention discloses a near-infrared second-region luminous gold-copper nanoprobe and a preparation method and application thereof, and the preparation method comprises the following steps: dissolving gold salt and a phase transfer agent in an organic solvent, stirring and dissolving, and standing in an ice bath; adding a phosphine ligand, rapidly stirring, and adding a reducing agent; adding a selenium ligand, continuously stirring and reacting, separating an organic phase, spin-drying, alternately washing with a good solvent and a poor solvent, and performing centrifugal crystallization and purification to obtain a black crystal precursor I; dissolving a copper salt in an alcohol solvent, adding an organic phosphorus ligand, carrying out a reaction, carrying out centrifugal separation on a precipitate, washing the precipitate with a poor solvent, and drying the washed precipitate to obtain a precursor II; and mixing and dissolving the precursor I and the precursor II in an organic solvent, stirring, centrifuging, taking a supernatant, spin-drying the supernatant, alternately washing with a good solvent and a poor solvent, and performing centrifugal crystallization purification to obtain the black crystal. The NIR-II luminescent imaging-guided tumor precise phototherapy material has precise atomic structure, photo-thermal conversion, NIR-II luminescence and active oxygen generation performance, and can be used for NIR-II luminescent imaging-guided tumor precise phototherapy.