Precious-metal nanometer bipyramid and preparing method thereof

A precious metal, double pyramid technology, applied in the fields of nanotechnology, nanotechnology, chemical instruments and methods, etc., can solve the problems of difficult preparation, limitation of the growth law of nanostructured crystals, etc.

Inactive Publication Date: 2015-12-09
WENZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, such nanostructures are difficult to prepare due to the limitation of crystal growth ru...

Method used

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  • Precious-metal nanometer bipyramid and preparing method thereof
  • Precious-metal nanometer bipyramid and preparing method thereof

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preparation example Construction

[0026] Another aspect of the present invention relates to a method for preparing the above-mentioned noble metal nano bipyramid body, which includes:

[0027] Step A, prepare Au nanoparticle seed solution: add HAuCl to the protective agent-reducing agent mixture in sequence 4 And AgNO 3 After uniform mixing, an Au nanoparticle mixing reaction system is obtained, and the Au nanoparticle mixing reaction system is reacted to obtain an Au nanoparticle seed liquid;

[0028] Step B, preparing precious metal nano-bicones: Pd salt is added to the Au nanoparticle seed solution and mixed uniformly, and then reacted to prepare the precious metal nano-bicones.

[0029] According to the method of the present invention, the Au nanoparticle seed solution prepared in step A contains decahedral Au nanoparticle seeds protected by a protective agent, and AgCl is also adsorbed on the surface of the decahedral Au nanoparticle seeds protected by the protective agent.

[0030] The inventors of the present in...

Embodiment 1

[0071] Example 1: Preparation of Au decahedral nanoparticles protected by polydienyl propylene dimethyl ammonium chloride in different sizes.

[0072] Mix 20mL of polyol with 0.4mL of polydiallyldimethylammonium chloride with a certain concentration and molecular weight and stir evenly, then add 5mg of dried HAuCl 4 , Then add 10mgAgNO 3 . After the mixed solution is uniformly stirred, the solution is reacted in an oil bath for 30 minutes, and the size of the decahedron is adjusted by controlling the reaction temperature.

[0073] The polyhydric alcohols are water-soluble polyhydric alcohols such as ethylene glycol, glycerol and pentanediol.

[0074] The molecular weight of the polydienyl propylene dimethyl ammonium chloride is 200,000 to 1 million.

[0075] The mass concentration of the polydienyl propylene dimethyl ammonium chloride is 20% to 35%.

[0076] The heating temperature of the oil bath is between 180-220°C.

Embodiment 2

[0077] Example 2: Using 20nm polydiallyldimethylammonium chloride protected Au decahedral nanoparticles as seeds, and using PdCl 2 As a Pd source, AuPd nano bipyramid was prepared.

[0078] Take a certain amount of 20nmAu decahedral nanoparticle solution and add PdCl 2 , Reacted in an oil bath at 180°C for 3 hours, where the molar ratio of Au to Pd was 0.125:1. So far, the AuPd nano-bipyramid nanostructure can be synthesized. Transfer the reaction solution in the bottle to a centrifuge tube, centrifuge for 10 minutes (10,000 revolutions / min), and disperse the collected precipitate in water again, then centrifuge again, and repeat the cleaning process 3 times to remove by-products and excess solvents and protect Agents, and finally a pure AuPd nano double cone can be obtained.

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Abstract

The invention relates to a precious-metal nanometer bipyramid and a preparing method thereof. The method includes the steps that an Au decanedron nano-particle protected with poly diallyldimethylammonium chloride serves as a seed, and Pd grows on the surface of the Au decanedron nano-particle in the [110] direction into the bipyramid. When prepared with the method, the Au and Pd nanometer bipyramid controllable in size and uniform in shape can be prepared. According to the Au and Pd nanometer bipyramid prepared with the method, high reproducibility is achieved, and convenience is brought to mass production; high water solubility is achieved, and a biological application in the future is facilitated; in addition, the Au and Pd nanometer bipyramid prepared with the method has a high-index crystal face, is good in catalysis activity and is potential formic acid fuel cell anode catalysts. The method is simple in preparing technology and low in cost and device requirement, and has the good industrial application prospects.

Description

Technical field [0001] The invention belongs to the technical field of precious metal nano materials, and relates to a precious metal nano double cone and a preparation method thereof. Background technique [0002] Because of the important potential applications of precious metal nanostructures in catalysis, optics and biology, they have attracted much attention. It is well known in the art that the properties and applications of nanomaterials are closely related to their structure, shape, size and composition. Therefore, a lot of efforts in this work are devoted to the controlled synthesis of structures. So far, many technologies have been successfully developed. [0003] Noble metal nanostructures wrapped by high-index crystal planes have high catalytic activity. This is mainly because their surface atoms have low complex coordination numbers, so these atoms have high activity. It has been confirmed that such nanostructures have good catalytic prospects. For example, Professor...

Claims

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Application Information

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IPC IPC(8): B22F9/24B82Y40/00B82Y30/00C30B7/14C30B29/02
Inventor 杨云马莹张礼杰邹超黄少铭
Owner WENZHOU UNIVERSITY
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