CN113828790B - Gold and preparation method of core-shell nanocrystalline thereof - Google Patents
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- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 title claims abstract description 81
- 239000010931 gold Substances 0.000 title claims abstract description 62
- 229910052737 gold Inorganic materials 0.000 title claims abstract description 60
- 239000011258 core-shell material Substances 0.000 title claims abstract description 14
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- 238000006243 chemical reaction Methods 0.000 claims abstract description 28
- 239000002159 nanocrystal Substances 0.000 claims abstract description 27
- 239000002253 acid Substances 0.000 claims abstract description 22
- 239000002105 nanoparticle Substances 0.000 claims abstract description 15
- 239000012295 chemical reaction liquid Substances 0.000 claims abstract description 9
- 239000002135 nanosheet Substances 0.000 claims abstract description 9
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 8
- 239000002270 dispersing agent Substances 0.000 claims abstract description 5
- 238000002156 mixing Methods 0.000 claims abstract description 4
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 16
- CXWXQJXEFPUFDZ-UHFFFAOYSA-N tetralin Chemical compound C1=CC=C2CCCCC2=C1 CXWXQJXEFPUFDZ-UHFFFAOYSA-N 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 9
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 7
- 229910052708 sodium Inorganic materials 0.000 claims description 7
- 239000011734 sodium Substances 0.000 claims description 7
- KNKRKFALVUDBJE-UHFFFAOYSA-N 1,2-dichloropropane Chemical compound CC(Cl)CCl KNKRKFALVUDBJE-UHFFFAOYSA-N 0.000 claims description 6
- CIWBSHSKHKDKBQ-JLAZNSOCSA-N Ascorbic acid Chemical compound OC[C@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-JLAZNSOCSA-N 0.000 claims description 6
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 6
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 claims description 5
- 229910052700 potassium Inorganic materials 0.000 claims description 5
- 239000011591 potassium Substances 0.000 claims description 5
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 claims description 4
- PVYPHUYXKVVURH-UHFFFAOYSA-N boron;2-methylpropan-2-amine Chemical compound [B].CC(C)(C)N PVYPHUYXKVVURH-UHFFFAOYSA-N 0.000 claims description 4
- 229910000510 noble metal Inorganic materials 0.000 claims description 4
- 150000003839 salts Chemical class 0.000 claims description 4
- 230000007704 transition Effects 0.000 claims description 4
- 150000001412 amines Chemical class 0.000 claims description 3
- 229960005070 ascorbic acid Drugs 0.000 claims description 3
- 235000010323 ascorbic acid Nutrition 0.000 claims description 3
- 239000011668 ascorbic acid Substances 0.000 claims description 3
- UIFPPCCBDYJNKI-UHFFFAOYSA-M Cl[Ir].[Na] Chemical compound Cl[Ir].[Na] UIFPPCCBDYJNKI-UHFFFAOYSA-M 0.000 claims description 2
- OHGGMGNYWFOMBC-UHFFFAOYSA-M Cl[Rh].[Na] Chemical compound Cl[Rh].[Na] OHGGMGNYWFOMBC-UHFFFAOYSA-M 0.000 claims description 2
- XQYHODZQMBWRQD-UHFFFAOYSA-M [Ag]Cl.[K] Chemical compound [Ag]Cl.[K] XQYHODZQMBWRQD-UHFFFAOYSA-M 0.000 claims description 2
- QJRLAKJPKOJRKX-UHFFFAOYSA-M [K].Cl[Rh] Chemical compound [K].Cl[Rh] QJRLAKJPKOJRKX-UHFFFAOYSA-M 0.000 claims description 2
- KQBUOSNYEKEFSN-UHFFFAOYSA-M [Na].[Cl-].[Ag+] Chemical compound [Na].[Cl-].[Ag+] KQBUOSNYEKEFSN-UHFFFAOYSA-M 0.000 claims description 2
- VKJKEPKFPUWCAS-UHFFFAOYSA-M potassium chlorate Chemical compound [K+].[O-]Cl(=O)=O VKJKEPKFPUWCAS-UHFFFAOYSA-M 0.000 claims 1
- 229910052723 transition metal Inorganic materials 0.000 abstract description 5
- 150000003624 transition metals Chemical class 0.000 abstract description 4
- 238000001308 synthesis method Methods 0.000 abstract description 3
- 150000002343 gold Chemical class 0.000 abstract 1
- 238000003917 TEM image Methods 0.000 description 14
- 238000000926 separation method Methods 0.000 description 8
- QGLWBTPVKHMVHM-KTKRTIGZSA-N (z)-octadec-9-en-1-amine Chemical compound CCCCCCCC\C=C/CCCCCCCCN QGLWBTPVKHMVHM-KTKRTIGZSA-N 0.000 description 7
- 239000000243 solution Substances 0.000 description 7
- 238000005406 washing Methods 0.000 description 7
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 6
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 4
- 239000002070 nanowire Substances 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- 238000003786 synthesis reaction Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- -1 gold transition metal Chemical group 0.000 description 3
- 230000002194 synthesizing effect Effects 0.000 description 3
- 229910001020 Au alloy Inorganic materials 0.000 description 2
- 229910001252 Pd alloy Inorganic materials 0.000 description 2
- 238000001311 chemical methods and process Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000007172 homogeneous catalysis Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 229910052763 palladium Inorganic materials 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- UYVKLVAKWTUDDI-UHFFFAOYSA-M [K].Cl[Ir] Chemical compound [K].Cl[Ir] UYVKLVAKWTUDDI-UHFFFAOYSA-M 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000002109 crystal growth method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- BBKFSSMUWOMYPI-UHFFFAOYSA-N gold palladium Chemical group [Pd].[Au] BBKFSSMUWOMYPI-UHFFFAOYSA-N 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002086 nanomaterial Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000002243 precursor Substances 0.000 description 1
- 239000003223 protective agent Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 230000005476 size effect Effects 0.000 description 1
- 239000012279 sodium borohydride Substances 0.000 description 1
- 229910000033 sodium borohydride Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/16—Making metallic powder or suspensions thereof using chemical processes
- B22F9/18—Making metallic powder or suspensions thereof using chemical processes with reduction of metal compounds
- B22F9/24—Making metallic powder or suspensions thereof using chemical processes with reduction of metal compounds starting from liquid metal compounds, e.g. solutions
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y40/00—Manufacture or treatment of nanostructures
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Nanotechnology (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Crystallography & Structural Chemistry (AREA)
- Composite Materials (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Manufacturing & Machinery (AREA)
- Manufacture Of Metal Powder And Suspensions Thereof (AREA)
Abstract
The application discloses a preparation method of gold nanocrystals, which sequentially comprises the following steps: (1) Mixing a reducing agent and a dispersing agent according to the volume ratio of 1-4:0.1-1 to prepare a reaction solution; (2) Adding chloroauric acid with preset mass into the reaction liquid, and carrying out standing reaction; when the concentration of chloroauric acid is 0.1-1mol/L, generating zero-dimensional gold nanoparticles; when the chloroauric acid concentration is lower than 0.07mol/L, generating one-dimensional ultra-long gold nanowires; when the chloroauric acid concentration is 0.08-0.09mol/L, the two-dimensional gold nano-sheet is generated. The application can synthesize a series of gold nanocrystals with different morphologies by a one-step synthesis method, and has the characteristics of simple operation, high yield, easy repetition, systematicness and the like. The application also discloses a preparation method of the gold core-shell nano-crystal, which can construct novel transition metal nano-building blocks based on gold nano-crystals with various morphologies.
Description
Technical Field
The invention relates to the technical field of transition metal solution chemical synthesis, in particular to a preparation method of gold and core-shell nanocrystals thereof.
Background
High quality nanocrystals are of great interest to researchers due to their unique optical, electronic, magnetic, etc. properties. The gold nanocrystals have potential application prospects in the fields of energy chemistry, biomedicine, food science and the like due to the unique size effect, surface effect, high potential and other properties. Therefore, the preparation of gold nanocrystals with different sizes and morphologies has important research significance.
The method for synthesizing the gold nanocrystals by a solution chemistry method comprises the following steps: white phosphorus reduction, sodium borohydride reduction, ethanol ultrasonic reduction, amine reduction, and the like. Sun et al first synthesized ultrafine, uniform, monodisperse gold nanocrystals in a two-step injection process at freezing point of chloroauric acid, oleylamine, tetralin, and tert-butylamine-borane complex systems (Nano Res,2008,1,229-234.). In addition, the gold/palladium alloy has great application value in the field of homogeneous catalysis. However, despite researchers' control over synthesizing gold nanocrystals of different morphologies by various solution chemistry methods to serve their corresponding scientific experimental studies, currently controlling the synthesis of various desired gold nanostructures remains a challenge.
At present, the synthesis method of gold nanocrystals mainly focuses on a seed crystal two-step growth method, namely, firstly synthesizing gold nanocrystals with small size, centrifuging and cleaning, taking gold nanocrystals as seed crystals, continuously feeding precursor chloroauric acid, a reducing agent, a protective agent (end capping agent) and the like, and continuously growing nanocrystals with different morphologies. However, the above-described two-step crystal growth method cannot flexibly control various morphologies of the synthesized gold nanocrystals, and has poor reproducibility. In contrast, in a one-step synthesis process, all reactants are subjected to a continuous chemical reaction in one reactor, which is simple to operate, high in yield, easy to repeat and systematic, while avoiding lengthy separation processes and purification of intermediate compounds. Thus, the one-step synthesis can save time and resources, increase the efficiency of the chemical reaction, and provide better chemical yields.
Disclosure of Invention
Accordingly, the invention aims to provide a preparation method of gold and core-shell nanocrystals thereof, so as to overcome the problems in the prior art. The technical scheme of the invention is realized as follows:
the preparation method of the gold nanocrystals sequentially comprises the following steps:
(1) Mixing a reducing agent and a dispersing agent according to the volume ratio of 1-4:0.1-1 to prepare a reaction solution;
(2) Adding chloroauric acid with preset mass into the reaction liquid, and carrying out standing reaction;
When the concentration of chloroauric acid in the reaction liquid is 0.1-1mol/L, generating zero-dimensional gold nanoparticles;
when the concentration of chloroauric acid in the reaction liquid is lower than 0.07mol/L, generating one-dimensional ultra-long gold nano-wires;
And when the concentration of chloroauric acid in the reaction solution is 0.08-0.09mol/L, generating the two-dimensional gold nano-sheet.
According to a further technical scheme, the dispersing agent comprises one or more of 1,2 dichloropropane, hexane, tetrahydronaphthalene, chloroform, ethanol or acetone which are mixed in any proportion.
According to a further technical scheme, the reducing agent comprises one or more of long-chain amine, oleylamine, tert-butylamine-borane complex or ascorbic acid which are mixed in any proportion.
The further technical scheme is that the temperature of the standing reaction is 0-70 ℃ and the time is 1-24h.
The further technical scheme is that the diameter of the zero-dimensional gold nano-particles is 5-20nm, the length of the one-dimensional ultra-long gold nano-wires is 1-15 mu m, and the length-diameter ratio of the two-dimensional gold nano-sheets is 1-5 mu m.
The further technical scheme is that the zero-dimensional gold nano particles increase the reaction pressure to generate one-dimensional short gold nano rods.
The further technical scheme is that the reaction pressure is 10-20MPa.
The preparation method of the core-shell nanocrystalline (namely, the gold core-shell nanocrystalline) of the gold nanocrystalline comprises the step of mixing and reacting the one-dimensional ultra-long gold nanowire with a reducing agent and second and third transition noble metal salts to generate the gold core-shell nanocrystalline (namely, the gold transition metal core-shell nanowire). The reaction process does not need the addition of protective gas, and has the advantages of low preparation cost, easy operation, repeatability and the like.
The second and third transition noble metal salts are one of sodium chloropalladate, potassium chloropalladate, sodium chloroplatinate, potassium chloroplatinate, sodium chloroiridium, potassium chloroiridium, sodium chlororhodium, potassium chlororhodium, sodium chlorosilver, potassium chlorosilver, sodium chlororuthenium and potassium chlororuthenium.
Compared with the prior art, the invention has the beneficial effects that:
1. According to the preparation method of gold nanocrystals, chloroauric acid with different quality can be preset and placed into the reaction liquid, so that the concentration of the chloroauric acid in the reaction liquid can be changed, and the morphology of the generated nanocrystals can be controlled. The method is simple and convenient to operate, and the control on the morphology of the generated nano-crystals is very flexible and easy to repeat.
2. The gold nanocrystals with different morphologies can be synthesized by a one-step synthesis method, and the method has the characteristics of simple operation, high yield, easiness in repetition, systematicness and the like, and has potential application prospects in the fields of photoelectrocatalysis, homogeneous catalysis and the like.
3. According to the preparation method of the core-shell nanocrystalline of the gold nanocrystalline, provided by the invention, novel transition metal nano building blocks can be constructed based on gold nanocrystalline with various morphologies, advantages of transition metals are complemented, and the maximum synergistic effect is achieved.
4. The invention prepares a series of high-quality gold and core-shell nanocrystalline thereof, and provides various choices on the diversity of targets.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only preferred embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a TEM image of 5nm gold nanoparticles obtained in example 1;
FIG. 2 is a TEM image of 17nm gold nanoparticles obtained in example 2;
FIG. 3 is a TEM image of the 11nm gold nanorods prepared in example 3;
FIG. 4 is a TEM image of the ultra-fine gold nanowires obtained in example 4;
FIG. 5 is a TEM image of the ultra-long gold nanowires obtained in example 5;
FIG. 6 is a TEM image of the gold nano-sheet obtained in example 6;
FIG. 7 is a TEM image of the ultra-long gold-palladium core-shell nanowires obtained in example 7.
Detailed Description
For a clear and complete description of the technical solutions of the present invention, it is apparent that the inventors have described in connection with the embodiments, but that the following embodiments describe only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
Preparing zero-dimensional 5nm gold nanoparticles: firstly, setting the temperature of a vortex oscillation reactor to 8 ℃; secondly, dissolving chloroauric acid with 2mmol in 20mL of mixed solution (comprising oleylamine, tetralin and tert-butylamine-borane complex), and placing the mixture on a vortex oscillation reactor for reaction for 1-2h; finally, centrifugal separation and acetone washing are carried out to obtain the superfine 5nm gold nanoparticles, and the yield is 90+/-5%. As shown in FIG. 1, FIG. 1 is a TEM image of 5nm gold nanoparticles obtained in example 1.
Example 2
Preparing zero-dimensional 12nm gold nanoparticles: dissolving 5mmol of chloroauric acid in 4mL of oleylamine and 1mL of 1,2 dichloropropane, raising the reaction temperature to 50-70 ℃, standing for reaction for 8-24h, and performing centrifugal separation and acetone washing for multiple times to obtain gold nanoparticles with the concentration of 12nm and the yield of 95+/-5%. As shown in FIG. 2, FIG. 2 is a TEM image of the 12nm gold nanoparticles obtained in example 2.
Example 3:
Preparing 11nm gold nanometer short bars: 11mmol of chloroauric acid is dissolved in 20mL of oleylamine and 2mL of 1,2 dichloropropane, the reaction temperature is increased to 50-70 ℃, the reaction pressure is increased, the reaction time is 12h, and the 11nm gold nano short bar is obtained through repeated centrifugal separation and acetone washing, and the yield is 90+/-5%. As shown in FIG. 3, FIG. 3 is a TEM image of the 11nm gold nanorods obtained in example 3.
Example 4:
Preparing one-dimensional superfine gold nano wires: dissolving 4mmol of chloroauric acid in 2-oleylamine and 2mL of hexane, raising the reaction temperature to 50-70 ℃, standing for reaction for 13h, and performing centrifugal separation and acetone washing for multiple times to obtain the superfine gold nanowire with the yield of 85+/-5%. As shown in FIG. 4, FIG. 4 is a TEM image of the ultrafine gold nanowires obtained in example 4.
Example 5:
Preparing the one-dimensional ultra-long gold nanowire. Dissolving 0.3mmol chloroauric acid in 4mL oleylamine and 2mL 1,2 dichloropropane, raising the reaction temperature to 50-70 ℃, standing for reaction for 1-24h, and obtaining the ultra-long gold nanowire with the yield of 95+/-5% through repeated centrifugal separation and acetone washing. As shown in FIG. 5, FIG. 5 is a TEM image of the ultra-long gold nanowires obtained in example 5.
Example 6:
Preparing a two-dimensional gold nano sheet: dissolving 0.48mmol chloroauric acid in 4mL oleylamine and 2mL 1,2 dichloropropane, raising the reaction temperature to 50-70 ℃, standing for reaction for 10-17h, and performing centrifugal separation and acetone washing for multiple times to obtain gold nanosheets with the yield of 80+/-5%. FIG. 6 is a TEM image of the gold nano-sheet obtained in example 6, as shown in FIG. 6.
Example 7:
Firstly, 1-20mg of gold nanowire, 0.l mL of ascorbic acid (0.01-0.5 mmol/L) and 100 mu L of sodium chloropalladate (mmol/L) are uniformly mixed, and the mixture is kept stand for 1-24h. And obtaining the ultra-long gold/palladium alloy nanowire through centrifugal separation and washing. If the concentration of sodium chloropalladate is continuously increased, a thicker palladium layer is only epitaxially grown on the gold nanorod, and the yield is 90+/-5%. As shown in fig. 7, fig. 7 is a TEM image of the ultra-long gold/palladium core-shell nanowires obtained in example 7.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (4)
1. The preparation method of the gold nanocrystals is characterized by comprising the following steps in sequence:
(1) Mixing a reducing agent and a dispersing agent according to the volume ratio of 1-4:0.1-1 to prepare a reaction solution;
(2) Adding chloroauric acid with preset mass into the reaction liquid, and carrying out standing reaction;
When the concentration of chloroauric acid in the reaction liquid is 0.1-1mol/L, generating zero-dimensional gold nanoparticles;
when the concentration of chloroauric acid in the reaction liquid is lower than 0.07mol/L, generating one-dimensional ultra-long gold nano-wires;
When the concentration of chloroauric acid in the reaction solution is 0.08-0.09 mol/L, generating a two-dimensional gold nano-sheet;
the dispersing agent comprises one or more of 1,2 dichloropropane, tetralin, chloroform, ethanol or acetone which are mixed in any proportion;
the reducing agent comprises one or more of long-chain amine, tert-butylamine-borane complex or ascorbic acid which are mixed in any proportion;
the diameter of the zero-dimensional gold nano-particles is 5-20 nm, the length of the one-dimensional ultra-long gold nano-wires is 1-15 mu m, and the length-diameter ratio of the two-dimensional gold nano-sheets is 1-5;
the one-dimensional ultra-long gold nanowires are mixed with a reducing agent and second and third transition noble metal salts to react, so that gold core-shell nanocrystals are generated;
The second and third transition noble metal salts are one of sodium chloropalladate, potassium chloropalladate, sodium chloroplatinate, potassium chloroplatinate, sodium chloroiridium, potassium chlorate, sodium chlororhodium, potassium chlororhodium, sodium chlorosilver, potassium chlorosilver, sodium chlororuthenate and potassium chlororuthenate.
2. The method for preparing gold nanocrystals according to claim 1, wherein the temperature of the standing reaction is 0-70 ℃ and the time is 1-24 h.
3. The method for preparing gold nanocrystals according to claim 1, wherein the zero-dimensional gold nanoparticles increase the reaction pressure to produce one-dimensional short gold nanorods.
4. A method of producing gold nanocrystals according to claim 3, wherein the reaction pressure is 10-20MPa.
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