Preparation method of gold nano-octahedrons

A technology of octahedron and gold nano, which is applied in the field of preparation of gold nano octahedron, can solve problems such as poor size uniformity of gold nano octahedron, complicated preparation process, and influence on product purity, and achieve good monodispersity, reduce error, The effect of simple and convenient operation

Inactive Publication Date: 2018-06-15
INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
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Problems solved by technology

However, these preparation methods all have some disadvantages. The size uniformity of the prepared gold nano-octahedron is poor, the yield is not high, and there are many impurities; in the preparation process, other metal impurity ions (Ag + ) or require gold species, so that the purity of the product is affected to a certain extent, and the preparation process is complicated
[0003] Up to now, the simple, controllable and stable preparation and synthesis of gold nano-octahedron is still a challenging task, which greatly limits its application in various fields of science and technology.

Method used

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  • Preparation method of gold nano-octahedrons
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  • Preparation method of gold nano-octahedrons

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[0027] The present invention provides a kind of preparation method of gold nanometer octahedron, adopt cationic surfactant polydiallyl dimethyl ammonium chloride (PDDA) as protective agent and shape control agent, in pentanediol (PD ) is the solvent and reducing agent in the system, the chloroauric acid (HAuCl 4 ) in the next step of reductive synthesis at high temperature.

[0028] Polydiallyldimethylammonium chloride (PDDA, Mw=200000~300000, 20wt%), pentanediol (PD) and chloroauric acid (HAuCl) used in the present invention 4 ) are directly purchased from the market without any purification treatment before use.

[0029] According to the content of the present invention, a solution of chloroauric acid in pentanediol (PD) with a molar concentration of 20 mM is prepared for use.

Embodiment 1

[0032] Under stirring conditions, 1 mL of chloroauric acid (HAuCl 4 ) of pentanediol (PD) solution and 0.8mL of polydiallyldimethylammonium chloride (PDDA) were added to the round bottom flask filled with 30mL of pentanediol (PD), in which chloroauric acid ( HAuCl 4 ) to polydiallyldimethylammonium chloride (PDDA) in a molar ratio of 1:50; after mixing and stirring evenly, the reaction solution is slightly yellow, and then reflux reaction at 220°C for 30 minutes, naturally cooled to room temperature to obtain a brown solution; the resulting solution was centrifuged at a speed of 15,000 rpm for 30 minutes with a high-speed centrifuge, and the upper layer of the colorless solution in the centrifuge tube was removed to obtain a brownish-yellow precipitated product, which is the product gold nanometer Octahedral granular material. The scanning electron microscope picture of the gold nano-octahedron prepared in this embodiment is as follows figure 1 As shown in (a), the results ...

Embodiment 2

[0034] Under stirring conditions, 1 mL of chloroauric acid (HAuCl 4 ) of pentanediol (PD) solution and 0.8mL of polydiallyldimethylammonium chloride (PDDA) were added to the round bottom flask filled with 30mL of pentanediol (PD), in which chloroauric acid ( HAuCl 4 ) to polydiallyldimethylammonium chloride (PDDA) in a molar ratio of 1:50; after being mixed and stirred evenly, the reaction solution is slightly yellow, and then refluxed at 200°C for 30 minutes, naturally cooled to room temperature to obtain a brown solution; the resulting solution was centrifuged at a speed of 15,000 rpm for 30 minutes with a high-speed centrifuge, and the upper layer of the colorless solution in the centrifuge tube was removed to obtain a brownish-yellow precipitated product, which is the product gold nanometer Octahedral granular material. The scanning electron microscope picture of the gold nano-octahedron prepared in this embodiment is as follows figure 2As shown, the results show that:...

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Abstract

The invention provides a preparation method of gold nano-octahedrons and belongs to the technical field of nanometer materials. The preparation method is provided for overcoming the defects in the prior art. The preparation method of the gold nano-octahedrons, provided by the invention, comprises the steps of selecting a cationic surfactant PDDA as a protective agent and a morphological control agent; synthesizing the gold nano-octahedrons from chloroauric acid under high temperature through one-time reduction. The preparation method has the characteristics of adopting the cationic surfactantand not introducing any new chemical components and foreign ions into the system. The preparation method is easy and convenient to operate and good in repeatability and controllability. The prepared and synthesized gold nano-octahedrons are good in monodispersity and uniform in particle size distribution. Moreover, various sizes of high-purity gold nano-octahedrons.

Description

technical field [0001] The invention relates to the technical field of gold nano material preparation, in particular to a preparation method of gold nano octahedron. Background technique [0002] The physical and chemical properties of noble metal nanomaterials with specific morphological structures are completely different from those of conventional bulk materials due to their small size effects, surface effects, and quantum size effects. At present, such materials have broad application prospects in industrial catalysis, optoelectronic devices, biosensing, imaging, etc. The gold nanomaterials concerned in the present invention are an important class of noble metal nanomaterials. So far, gold nanoparticles with various shapes have been successfully prepared and synthesized, such as: gold nanospheres, gold nanorods, gold nanowires, gold nanobicones, gold nanosheets, gold nanopolyhedra and so on. Relatively speaking, it is still difficult to stably prepare high-yield and hi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B22F1/00B82Y40/00B82Y30/00
CPCB82Y30/00B82Y40/00B22F9/24B22F1/0553B22F1/054B22F1/07
Inventor 卢永刚张海斌刘红方敬忠伍凡
Owner INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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