Preparation method of quintuple twin crystal gold nanoparticles

Abstract

The invention discloses a preparation method of quintuple twin-crystal gold nanoparticles, and belongs to the technical field of quintuple twin-crystal gold nanoparticles, and the preparation method comprises the following steps: step 1, respectively preparing a solution for dissolving a metal salt, a solution for dissolving an organic ligand and a solution for dissolving a surfactant; 2, uniformly mixing and stirring the three solutions obtained in the step 1 to obtain a metal organic framework growth solution; step 3, adding a precursor solution of gold into the metal organic framework growth solution, uniformly stirring, transferring into a reaction kettle, and reacting at the temperature of 80-180 DEG C for 0.5-72 hours; and 4, centrifugally washing the product by using a polar solvent, and drying to obtain the quintuple twin crystal gold nanoparticles. A precursor of gold is added into a metal organic framework growth solution, metal ions, organic ligands and a surfactant contained in the metal organic framework growth solution are used for adsorbing specific crystal faces of the gold nanoparticles in the nucleation and crystallization process, and the quintuple twin crystal gold nanoparticles are finally obtained through solvothermal reaction.

Description

Technical Field

[0001] The invention belongs to the technical field of quintuple twinned gold nanoparticles, and particularly relates to a method for preparing quintuple twinned gold nanoparticles. Background Art

[0002] Gold nanoparticles are an intermediate between metal blocks and atoms, showing special chemical, electronic and physical properties, and have good stability, small size effect, surface effect, optical effect and special bioaffinity, and have very important application value in the fields of catalysis, biosensing, etc. In addition, gold nanoparticles are also a photothermal conversion material. Under the irradiation of sunlight, the electron density waves generated by the interaction between the free vibrating electrons on the metal surface and photons resonate, that is, surface plasma resonance, which can convert light heat into heat energy generated by vibration.

[0003] Gold nanoparticles have also attracted in-depth research in other fields due to their excellent surface plasmon resonance properties, such as photothermal method for targeted attack on tumor cells, medical imaging, photochemical synthesis, single-particle molecular sensors, surface-enhanced Raman spectroscopy, LSPR sensors, photonic devices, etc. At present, gold nanoparticles with various structures such as gold nanospheres, gold nanosheets, gold nanorods, and gold nanopolyhedrons can be prepared by reducing agent reduction, photoreduction, electrochemical reduction, and ultrasonic reduction.

[0004] The extraordinary performance of nanomaterials is often attributed to their unique structural characteristics. The pentatwinned structure has become a research focus in the materials science community due to its complex structure at the nanoscale. The structure is characterized by five identical crystal units arranged symmetrically around a shared center point, showing a unique five-fold rotational symmetry aesthetic. Pentatwinned structures are seen in both nature and artificial systems, such as nanomaterials such as gold, palladium, and platinum, where they give these materials excellent mechanical strength, catalytic efficiency, and optical effects. However, their preparation methods often require purification or secondary treatment to increase the yield. In order to fully explore and utilize the optical properties of these nanostructures that are closely related to morphology and size, it is particularly important to develop a simple, safe, and universal preparation method.

[0005] In view of this, the inventor conducted in-depth research on this demand, which resulted in this case. Summary of the invention

[0006] In order to overcome the problem that the preparation method in the prior art often requires purification or secondary treatment to improve the yield, the present invention provides a method for preparing quintuple twinned gold nanoparticles, comprising the following steps:

[0007] Step 1, respectively preparing a solution for dissolving a metal salt, a solution for dissolving an organic ligand, and a solution for dissolving a surfactant;

[0008] Step 2: Mix and stir the three solutions obtained in step 1 to obtain a metal organic framework growth solution;

[0009] Step 3: Add the gold precursor solution to the metal organic framework growth solution, stir evenly and transfer to a reaction kettle, the reaction temperature is 80-180° C., and the reaction time is 0.5-72 hours;

[0010] Step 4: The product obtained in step 3 is centrifugally washed with a polar solvent and dried to obtain quintuple twinned gold nanoparticles.

[0011] Furthermore, in the step 2, the concentration of the metal salt in the metal organic framework growth solution is 0.1-10 mol / L, the molar ratio of the organic ligand to the metal salt is 1-160:1, and the concentration of the surfactant is 0.1-20 g / mL.

[0012] Furthermore, the metal salt in step one includes at least one of zinc nitrate, zinc acetate, zinc chloride, cobalt nitrate, cobalt acetate, cobalt chloride, nickel nitrate, nickel acetate, nickel chloride, copper nitrate, copper acetate, copper chloride, ferric nitrate, ferric acetate, ferric chloride, manganese nitrate, manganese acetate, manganese chloride, zirconium nitrate, zirconium acetate and zirconium chloride.

[0013] Furthermore, the organic ligand in step one includes at least one of 2-methylimidazole, 1-methylimidazole, 2-nitroimidazole, benzimidazole, 5-nitrobenzimidazole, terephthalic acid, 2-aminoterephthalic acid, 2,4-diaminoterephthalic acid, biphenyl dicarboxylic acid, trimesic acid, and 2-aminotrimesic acid.

[0014] Furthermore, the surfactant in step 1 includes at least one of stearic acid, oleic acid, lauric acid, sodium dodecyl sulfate, sodium hexadecyl sulfate, sodium octadecyl sulfate, hexadecyltrimethylammonium bromide, lecithin, polysorbate, polyoxyethylene-polyoxypropylene copolymer and polyvinylpyrrolidone.

[0015] Furthermore, the concentration of the gold precursor solution is 0.1-10 mol / L.

[0016] Furthermore, the gold precursor solution in step three includes at least one of chloroauric acid, sodium chloroaurate, potassium chloroaurate, bromoauric acid, sodium bromoaurate, potassium bromoaurate, gold chloride, gold bromide, potassium gold cyanide, sodium gold cyanide, gold oxide, and gold hydroxide.

[0017] Furthermore, the solvents in steps one to four include at least one of N,N-dimethylformamide, N,N-dimethylacetamide, formamide, acetamide, methanol, ethanol, ethylene glycol, propanol, glycerol, chloroform, chloroform, dichloromethane, monochloromethane, and deionized water.

[0018] The present invention also provides a quintuple twinned gold nanoparticle, wherein the quintuple twinned gold nanoparticle is obtained by the preparation method of the quintuple twinned gold nanoparticle according to claims 1-8.

[0019] The beneficial effects produced by the technical solution of the present invention are as follows:

[0020] (1) The present invention discloses a method for preparing quintuple twinned gold nanoparticles, wherein the method comprises adding a gold precursor to a metal organic framework growth solution, utilizing the metal ions, organic ligands and surfactants contained in the metal organic framework growth solution to adsorb specific crystal faces of the gold nanoparticles during the nucleation and crystallization process, and finally obtaining quintuple twinned gold nanoparticles through a solvothermal reaction. The gold precursor is added to the MOF growth solution, and the quintuple twinned gold nanoparticles finally obtained have a thin MOF protective layer on the surface, and do not need to add seed crystals. The synthesis is achieved by utilizing the adsorption of specific gold crystal faces by organic ligands in the MOF growth solution.

[0021] (2) The method provided by the present invention is simple, easy to operate, has mild conditions and high safety. Metal ions, organic ligands and surfactants are dissolved in the metal organic framework growth solution, which are used to adsorb specific crystal faces during the nucleation and crystallization of gold nanoparticles. After a solvothermal reaction, quintuple twinned gold nanoparticles are finally obtained. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 is a scanning electron microscope image of quintuple twinned gold nanoparticles prepared in Example 1 of the present invention;

[0024] Figure 2 is a transmission electron microscope image of five-fold twinned gold nanoparticles prepared in Example 1 of the present invention;

[0025] Figure 3 is a high-resolution transmission electron microscopy image of quintuple twinned gold nanoparticles prepared in Example 1 of the present invention;

[0026] Figure 4This is the X-ray diffraction pattern of the five-fold twinned gold nanoparticles prepared in Example 1 of the present invention. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0028] This embodiment adopts the method of adding a gold precursor to a metal organic framework growth solution, utilizing the metal ions, organic ligands and surfactants contained in the metal organic framework growth solution to adsorb specific crystal faces of gold nanoparticles during the nucleation and crystallization process, and finally obtaining five-fold twinned gold nanoparticles through a solvothermal reaction. The specific embodiments are as follows:

[0029] A method for preparing quintuple twinned gold nanoparticles comprises the following steps:

[0030] Step 1, respectively preparing a solution for dissolving a metal salt, a solution for dissolving an organic ligand, and a solution for dissolving a surfactant;

[0031] Step 2: Mix and stir the three solutions obtained in step 1 to obtain a metal organic framework growth solution;

[0032] Step 3: Add the gold precursor solution to the metal organic framework growth solution, stir evenly and transfer to a reaction kettle, the reaction temperature is 80-180° C., and the reaction time is 0.5-72 hours;

[0033] Step 4: The product obtained in step 3 is centrifugally washed with a polar solvent and dried to obtain quintuple twinned gold nanoparticles.

[0034] As a preferred embodiment, in the step 2, the concentration of the metal salt in the metal organic framework growth solution is 0.1-10 mol / L, the molar ratio of the organic ligand to the metal salt is 1-160:1, and the concentration of the surfactant is 0.1-20 g / mL.

[0035] As a preferred embodiment, the metal salt in step one includes at least one of zinc nitrate, zinc acetate, zinc chloride, cobalt nitrate, cobalt acetate, cobalt chloride, nickel nitrate, nickel acetate, nickel chloride, copper nitrate, copper acetate, copper chloride, ferric nitrate, ferric acetate, ferric chloride, manganese nitrate, manganese acetate, manganese chloride, zirconium nitrate, zirconium acetate and zirconium chloride.

[0036] As a preferred embodiment, the organic ligand in step one includes at least one of 2-methylimidazole, 1-methylimidazole, 2-nitroimidazole, benzimidazole, 5-nitrobenzimidazole, terephthalic acid, 2-aminoterephthalic acid, 2,4-diaminoterephthalic acid, biphenyl dicarboxylic acid, trimesic acid, and 2-aminotrimesic acid.

[0037] As a preferred embodiment, the surfactant in step one includes at least one of stearic acid, oleic acid, lauric acid, sodium dodecyl sulfate, sodium hexadecyl sulfate, sodium octadecyl sulfate, hexadecyltrimethylammonium bromide, lecithin, polysorbate, polyoxyethylene-polyoxypropylene copolymer and polyvinyl pyrrolidone.

[0038] As a preferred embodiment, the concentration of the gold precursor solution is 0.1-10 mol / L.

[0039] As a preferred embodiment, the gold precursor solution in step three includes at least one of chloroauric acid, sodium chloroaurate, potassium chloroaurate, bromoauric acid, sodium bromoaurate, potassium bromoaurate, gold chloride, gold bromide, potassium gold cyanide, sodium gold cyanide, gold oxide, and gold hydroxide.

[0040] As a preferred embodiment, the solvents in steps 1 to 4 include at least one of N,N-dimethylformamide, N,N-dimethylacetamide, formamide, acetamide, methanol, ethanol, ethylene glycol, propanol, glycerol, chloroform, chloroform, dichloromethane, monochloromethane, and deionized water.

[0041] This embodiment also provides a quintuple twinned gold nanoparticle, which is obtained by the above-mentioned method for preparing quintuple twinned gold nanoparticles.

[0042] Example 1

[0043] A method for preparing quintuple twinned gold nanoparticles comprises the following steps:

[0044] Step 1, weigh 113.8 mg of zirconium chloride, 30 mg of terephthalic acid and 10.9 g of polyvinyl pyrrolidone respectively; measure 5 mL of N, N-dimethylformamide and 3 mL of ethanol mixed solution to prepare a solution for dissolving metal salt, a solution for organic ligand and a solution for surfactant respectively;

[0045] Step 2: Mix and stir the three solutions obtained in step 1 to obtain a metal organic framework growth solution, wherein the concentration of the metal salt is 5 mol / L, the molar ratio of the organic ligand to the metal salt is 50:1, and the concentration of polyvinyl pyrrolidone in the surfactant solution is 10 g / mL;

[0046] Step 3: After the metal organic framework growth solution is stirred and dissolved, a chloroauric acid solution is added, wherein the concentration of the chloroauric acid solution is 10 mol / L, and then the mixture is stirred evenly and transferred to a reactor. The reaction temperature is 140° C. and the reaction time is 3 hours.

[0047] Step 4: Wash the product obtained in step 3 with N,N-dimethylformamide and ethanol three times respectively, and then dry it in an oven at 60°C to obtain quintuple twinned gold nanoparticles.

[0048] Example 2

[0049] A method for preparing quintuple twinned gold nanoparticles comprises the following steps:

[0050] Step 1, weigh 110.2 mg of copper chloride, 30 mg of p-benzimidazole and 10.5 g of sodium dodecyl sulfate respectively; measure 5 mL of N, N-dimethylacetamide and 3 mL of ethanol mixed solution to prepare a solution for dissolving metal salt, a solution for organic ligand and a solution for surfactant respectively;

[0051] Step 2: Mix and stir the three solutions obtained in step 1 to obtain a metal organic framework growth solution, wherein the concentration of the metal salt is 10 mol / L, the molar ratio of the organic ligand to the metal salt is 16:1, and the concentration of sodium dodecyl sulfate in the surfactant solution is 10 g / mL;

[0052] Step 3: After the metal organic framework growth solution is stirred and dissolved, a chloroauric acid solution is added, wherein the concentration of the chloroauric acid solution is 0.1 mol / L, and then the mixture is stirred evenly and transferred to a reaction kettle. The reaction temperature is 140° C. and the reaction time is 5 hours.

[0053] Step 4: Wash the product obtained in step 3 with N,N-dimethylformamide and ethanol three times respectively, and then dry it in an oven at 60°C to obtain quintuple twinned gold nanoparticles.

[0054] Example 3

[0055] A method for preparing quintuple twinned gold nanoparticles comprises the following steps:

[0056] Step 1, weigh 110 mg of ferric acetate, 30 mg of diphenyl dicarboxylic acid and 10 g of lauric acid respectively; measure 5 mL of N, N-dimethylacetamide and 3 mL of ethanol mixed solution to prepare a solution for dissolving a metal salt, a solution for dissolving an organic ligand and a solution for dissolving a surfactant respectively;

[0057] Step 2: Mix and stir the three solutions obtained in step 1 to obtain a metal organic framework growth solution, wherein the concentration of the metal salt is 5 mol / L, the molar ratio of the organic ligand to the metal salt is 15:1, and the concentration of lauric acid in the surfactant solution is 2 g / mL;

[0058] Step 3: After the metal organic framework growth solution is stirred and dissolved, a gold bromide solution is added, wherein the concentration of the gold bromide solution is 1 mol / L, and then the mixture is stirred evenly and transferred to a reaction kettle. The reaction temperature is 130° C. and the reaction time is 5 hours.

[0059] Step 4: Wash the product obtained in step 3 three times with N,N-dimethylformamide and deionized water respectively, and then dry it in an oven at 60° C. to obtain quintuple twinned gold nanoparticles.

[0060] Example 4

[0061] A method for preparing quintuple twinned gold nanoparticles comprises the following steps:

[0062] Step 1, weigh 113.8 mg of zirconium chloride, 30 mg of terephthalic acid and 10.9 g of polyvinyl pyrrolidone respectively; measure 5 mL of N, N-dimethylformamide and 3 mL of ethanol mixed solution to prepare a solution for dissolving metal salt, a solution for organic ligand and a solution for surfactant respectively;

[0063] Step 2: Mix and stir the three solutions obtained in step 1 to obtain a metal organic framework growth solution, wherein the concentration of the metal salt is 5 mol / L, the molar ratio of the organic ligand to the metal salt is 160:1, and the concentration of polyvinyl pyrrolidone in the surfactant solution is 10 g / mL;

[0064] Step 3: After the metal organic framework growth solution is stirred and dissolved, potassium chloroaurate solution is added, where the concentration of the chloroauric acid solution is 10 mol / L, and then the mixture is stirred evenly and transferred to a reactor. The reaction temperature is 140° C. and the reaction time is 3 hours.

[0065] Step 4: Wash the product obtained in step 3 with N,N-dimethylformamide and ethanol three times respectively, and then dry it in an oven at 60°C to obtain quintuple twinned gold nanoparticles.

[0066] Example 5

[0067] A method for preparing quintuple twinned gold nanoparticles comprises the following steps:

[0068] Step 1, weigh 100 mg of zirconium chloride, 40 mg of terephthalic acid and 15 g of polyvinyl pyrrolidone respectively; measure 5 mL of formamide and 3 mL of ethylene glycol mixed solution to prepare a solution for dissolving metal salts, a solution for organic ligands and a solution for surfactants respectively;

[0069] Step 2: Mix and stir the three solutions obtained in step 1 to obtain a metal organic framework growth solution, wherein the concentration of the metal salt is 5 mol / L, the molar ratio of the organic ligand to the metal salt is 15:1, and the concentration of polyvinyl pyrrolidone in the surfactant solution is 0.1 g / mL;

[0070] Step 3: After the metal organic framework growth solution is stirred and dissolved, sodium bromoaurate solution is added, wherein the concentration of the sodium bromoaurate solution is 1 mol / L, and then the mixture is stirred evenly and transferred to a reactor. The reaction temperature is 140° C. and the reaction time is 3 hours.

[0071] Step 4: Wash the product obtained in step 3 three times with dichloromethane and deionized water, and then dry it in an oven at 60° C. to obtain quintuple twinned gold nanoparticles.

[0072] Example 6

[0073] A method for preparing quintuple twinned gold nanoparticles comprises the following steps:

[0074] Step 1, weigh 110 mg of manganese nitrate, 30 mg of 2,4-diaminoterephthalic acid and 10.9 g of sodium hexadecyl sulfate respectively; measure 5 mL of N,N-dimethylformamide and 3 mL of glycerol mixed solution to prepare a solution for dissolving metal salts, a solution for organic ligands and a solution for surfactants respectively;

[0075] Step 2: Mix and stir the three solutions obtained in step 1 to obtain a metal organic framework growth solution, wherein the concentration of the metal salt is 10 mol / L, the molar ratio of the organic ligand to the metal salt is 16:1, and the concentration of sodium hexadecyl sulfate in the surfactant solution is 10 g / mL;

[0076] Step 3: After the metal organic framework growth solution is stirred and dissolved, a gold oxide solution is added, wherein the concentration of the gold oxide solution is 5 mol / L, and then the solution is stirred evenly and transferred to a reactor. The reaction temperature is 150° C. and the reaction time is 3 hours.

[0077] Step 4: The product obtained in step 3 was washed three times with N,N-dimethylacetamide and chloroform respectively, and then dried in an oven at 60°C to obtain quintuple twinned gold nanoparticles.

[0078] Example 7

[0079] A method for preparing quintuple twinned gold nanoparticles comprises the following steps:

[0080] Step 1, weigh 100 mg of cobalt chloride, 40 mg of 1-methylimidazole and 10 g of polyvinyl pyrrolidone respectively; measure 5 mL of lecithin and 3 mL of ethanol mixed solution to prepare a solution for dissolving metal salts, a solution for organic ligands and a solution for surfactants respectively;

[0081] Step 2: Mix and stir the three solutions obtained in step 1 to obtain a metal organic framework growth solution, wherein the concentration of the metal salt is 5 mol / L, the molar ratio of the organic ligand to the metal salt is 50:1, and the concentration of lecithin in the surfactant solution is 10 g / mL;

[0082] Step 3: After the metal organic framework growth solution is stirred and dissolved, potassium gold cyanide solution is added, where the concentration of potassium gold cyanide solution is 1 mol / L, and then the mixture is stirred evenly and transferred to a reactor. The reaction temperature is 140° C. and the reaction time is 5 hours.

[0083] Step 4: Wash the product obtained in step 3 with chloroform and ethanol three times respectively, and then dry it in an oven at 60°C to obtain quintuple twinned gold nanoparticles.

[0084] Example 8

[0085] A method for preparing quintuple twinned gold nanoparticles comprises the following steps:

[0086] Step 1, weigh 120 mg of ferric chloride, 30 mg of 5-nitrobenzimidazole and 10 g of polysorbate respectively; measure 5 mL of acetamide and 3 mL of deionized water mixed solution to prepare a solution for dissolving metal salts, a solution for organic ligands and a solution for surfactants respectively;

[0087] Step 2: Mix and stir the three solutions obtained in step 1 to obtain a metal organic framework growth solution, wherein the concentration of the metal salt is 1 mol / L, the molar ratio of the organic ligand to the metal salt is 16:1, and the concentration of the polysorbate in the surfactant solution is 10 g / mL;

[0088] Step 3: After the metal organic framework growth solution is stirred and dissolved, a bromoauric acid solution is added, wherein the concentration of the bromoauric acid solution is 10 mol / L, and then the mixture is stirred evenly and transferred to a reaction kettle. The reaction temperature is 160° C. and the reaction time is 5 hours.

[0089] Step 4: Wash the product obtained in step 3 with N,N-dimethylformamide and ethanol three times respectively, and then dry it in an oven at 60°C to obtain quintuple twinned gold nanoparticles.

[0090] Example 9

[0091] A method for preparing quintuple twinned gold nanoparticles comprises the following steps:

[0092] Step 1, weigh 120 mg of zinc acetate, 30 mg of 2-methylimidazole and 10 g of hexadecyltrimethylammonium bromide respectively; measure 5 mL of N,N-dimethylformamide and 3 mL of ethanol mixed solution to prepare a solution for dissolving a metal salt, a solution for dissolving an organic ligand and a solution for dissolving a surfactant respectively;

[0093] Step 2: Mix and stir the three solutions obtained in step 1 to obtain a metal organic framework growth solution, wherein the concentration of the metal salt is 5 mol / L, the molar ratio of the organic ligand to the metal salt is 50:1, and the concentration of hexadecyltrimethylammonium bromide in the surfactant solution is 10 g / mL;

[0094] Step 3: After the metal organic framework growth solution is stirred and dissolved, a gold hydroxide solution is added, wherein the concentration of the gold hydroxide solution is 10 mol / L, and then the mixture is stirred evenly and transferred to a reactor. The reaction temperature is 140° C. and the reaction time is 3 hours.

[0095] Step 4: Wash the product obtained in step 3 with N,N-dimethylformamide and ethanol three times respectively, and then dry it in an oven at 60°C to obtain quintuple twinned gold nanoparticles.

[0096] Example 10

[0097] A method for preparing quintuple twinned gold nanoparticles comprises the following steps:

[0098] Step 1, weigh 110 mg of nickel acetate, 30 mg of trimesic acid and 12 g of sodium octadecyl sulfate respectively; measure 5 mL of N,N-dimethylformamide and 3 mL of ethanol mixed solution to prepare a solution for dissolving metal salt, a solution for organic ligand and a solution for surfactant respectively;

[0099] Step 2: Mix and stir the three solutions obtained in step 1 to obtain a metal organic framework growth solution, wherein the concentration of the metal salt is 5 mol / L, the molar ratio of the organic ligand to the metal salt is 50:1, and the concentration of sodium octadecyl sulfate in the surfactant solution is 10 g / mL;

[0100] Step 3: After the metal organic framework growth solution is stirred and dissolved, sodium bromoaurate solution is added, where the concentration of the sodium bromoaurate solution is 10 mol / L, and then the mixture is stirred evenly and transferred to a reactor. The reaction temperature is 140° C. and the reaction time is 3 hours.

[0101] Step 4: Wash the product obtained in step 3 with N,N-dimethylformamide and ethanol three times respectively, and then dry it in an oven at 60°C to obtain quintuple twinned gold nanoparticles.

[0102] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for preparing quintuple twinned gold nanoparticles, characterized in that: The steps include: Step 1, respectively preparing a solution for dissolving a metal salt, a solution for dissolving an organic ligand, and a solution for dissolving a surfactant; Step 2: Mix and stir the three solutions obtained in step 1 to obtain a metal organic framework growth solution; Step 3: Add the gold precursor solution to the metal organic framework growth solution, stir evenly and transfer to a reaction kettle, the reaction temperature is 80-180° C., and the reaction time is 0.5-72 hours; Step 4: The product obtained in step 3 is centrifugally washed with a polar solvent and dried to obtain quintuple twinned gold nanoparticles.

2. The method for preparing quintuple twinned gold nanoparticles according to claim 1, characterized in that: In the step 2, the concentration of the metal salt in the metal organic framework growth solution is 0.1-10 mol / L, the molar ratio of the organic ligand to the metal salt is 1-160:1, and the concentration of the surfactant is 0.1-20 g / mL.

3. The method for preparing quintuple twinned gold nanoparticles according to claim 1, characterized in that: The metal salt in step one includes at least one of zinc nitrate, zinc acetate, zinc chloride, cobalt nitrate, cobalt acetate, cobalt chloride, nickel nitrate, nickel acetate, nickel chloride, copper nitrate, copper acetate, copper chloride, ferric nitrate, ferric acetate, ferric chloride, manganese nitrate, manganese acetate, manganese chloride, zirconium nitrate, zirconium acetate and zirconium chloride.

4. The method for preparing quintuple twinned gold nanoparticles according to claim 1, characterized in that: The organic ligand in step 1 includes at least one of 2-methylimidazole, 1-methylimidazole, 2-nitroimidazole, benzimidazole, 5-nitrobenzimidazole, terephthalic acid, 2-aminoterephthalic acid, 2,4-diaminoterephthalic acid, biphenyl dicarboxylic acid, trimesic acid, and 2-aminotrimesic acid.

5. The method for preparing quintuple twinned gold nanoparticles according to claim 1, characterized in that: The surfactant in step 1 includes at least one of stearic acid, oleic acid, lauric acid, sodium dodecyl sulfate, sodium hexadecyl sulfate, sodium octadecyl sulfate, hexadecyltrimethylammonium bromide, lecithin, polysorbate, polyoxyethylene-polyoxypropylene copolymer and polyvinyl pyrrolidone.

6. The method for preparing quintuple twinned gold nanoparticles according to claim 1, characterized in that: The gold precursor solution in step three includes at least one of chloroauric acid, sodium chloroaurate, potassium chloroaurate, bromoauric acid, sodium bromoaurate, potassium bromoaurate, gold chloride, gold bromide, potassium gold cyanide, sodium gold cyanide, gold oxide, and gold hydroxide.

7. The method for preparing quintuple twinned gold nanoparticles according to claim 6, characterized in that: The concentration of the gold precursor solution is 0.1-10 mol / L.

8. The method for preparing quintuple twinned gold nanoparticles according to claim 1, characterized in that: The solvents in steps 1 to 4 include at least one of N,N-dimethylformamide, N,N-dimethylacetamide, formamide, acetamide, methanol, ethanol, ethylene glycol, propanol, glycerol, chloroform, chloroform, dichloromethane, monochloromethane, and deionized water.

9. A quintuple twinned gold nanoparticle, characterized in that the quintuple twinned gold nanoparticle is obtained by the preparation method of the quintuple twinned gold nanoparticle according to claims 1-8.

Images