Noble metal nano ring and preparation method thereof

A technology of nano-rings and noble metals, applied in the field of noble metal nano-rings and its preparation, can solve the problems of low product purity and uncontrollable Pt high-selectivity growth

Inactive Publication Date: 2017-07-21
WENZHOU UNIVERSITY
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

Huang's group confirmed that by selectively etching the outer edge of gold decahedral nanoparticles, and then inducing the selective growth of Pt on the outer edge, and then further etching Au, colloidal chemistry can also be used to prepare Pt nanorings (N.Fan, Y .Yang, W.Wang, L.Zhang, W.Chen, C.Zou, S.Huang.ACS Nano, 2012, 6, 4072-4082), however, due to the inability to control the high selectivity of Pt on the outer edge of the Au decahedron growth, the purity of the product obtained by this method is relatively low, and it is doped with other non-cyclic nanostructures

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  • Noble metal nano ring and preparation method thereof
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  • Noble metal nano ring and preparation method thereof

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preparation example Construction

[0031] Another aspect of the present invention relates to a method for preparing the aforementioned noble metal nanorings, which includes:

[0032] Step A, prepare Au nano material template solution: add HAuCl to the protective agent-reducing agent I mixture in sequence 4 And AgNO 3 After uniform mixing, an Au nanomaterial mixing reaction system is obtained, and the Au nanomaterial mixing reaction system is reacted to prepare an Au nanomaterial template liquid;

[0033] Step B, preparing precious metal nanorings: adding M source and reducing agent II to the Au material template solution and mixing uniformly, and then reacting to prepare precious metal nanorings.

[0034] In a specific embodiment of the present invention, in step A, the Au nanomaterial mixing reaction system is reacted (under aerobic conditions) to prepare an Au nanomaterial template solution. The Au nanomaterial template liquid contains decahedral Au nanoparticle seeds protected by a protective agent, and AgCl is als...

Embodiment 1

[0086] Example 1: Preparation of Au nanomaterial template liquid containing Au decahedral nanoparticles

[0087] 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 10mg AgNO 3 . After the mixed solution is evenly stirred, the solution is reacted in an oil bath for 30 minutes, and the size of the decahedron can be adjusted by controlling the reaction temperature.

[0088] The polyhydric alcohol is ethylene glycol, glycerol, pentanediol and the like.

[0089] The molecular weight of the polydiallyldimethylammonium chloride is 200,000-1,000,000.

[0090] The mass concentration of the polydiallyldimethylammonium chloride is 20% to 35%.

[0091] The reaction is carried out in an oil bath, and the chloroauric acid must be dried before use. The temperature of the oil bath is 180-220℃.

[0092] The concentration of chloroauric acid is 2-8 mg / mL.

Embodiment 2

[0093] Example 2: Preparation of Au nanomaterial template liquid containing Au nanosheets

[0094] 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 10mg AgNO 3 . After the mixed solution is uniformly stirred, nitrogen gas is blown for 30 minutes to remove oxygen in the solution, and then nitrogen gas is continued to react in an oil bath for 30 minutes. The Au nanosheet size can be adjusted by controlling the reaction temperature.

[0095] The polyhydric alcohol is ethylene glycol, glycerol, pentanediol and the like.

[0096] The molecular weight of the polydiallyldimethylammonium chloride is 200,000-1,000,000.

[0097] The mass concentration of the polydiallyldimethylammonium chloride is 20% to 35%.

[0098] The reaction is carried out in an oil bath, and the chloroauric acid must be dried before use.

[0099] The oil bath temperature is 180-220°C.

[0100] The...

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Abstract

The invention relates to a precious metal nanoring and a preparation method thereof. According to the method, an Au nanosheet or a decanedron Au nano particle protected by diallyldimethylammonium chloride serves as a template, M-Ag grows on the surface of the Au nanosheet or the decanedron Au nano particle in a directional mode, and then a round or polygonal Au / M-Ag nanoring is obtained by selectively etching Au. The Au / M-Ag nanoring prepared through the method is smooth in surface, uniform in size, high in purity and capable of being produced on a large scale. The Au / M-Ag nanoring prepared through the method and protected through a protective agent has high water solubility and is beneficial for application in biology in the future. The Au / M-Ag nanoring prepared through the method contains a high-index crystal face, is good in catalytic activity and is a potential formic acid fuel battery anode catalyst. The method is simple in manufacturing technology, short in reaction time, low in cost and low in equipment requirement and has good industrial application prospects.

Description

Technical field [0001] The invention belongs to the field of precious metal nano materials, and particularly relates to a precious metal nano ring and a preparation method thereof. Background technique [0002] Noble metal nanostructures have good application prospects in the fields of catalysis, biomedicine, etc., so they have attracted the attention of scientific researchers all over the world. [0003] The physical and chemical properties of noble metal nanostructures are closely related to their morphology. The noble metal ring structure plays an important role in the field of optics. The ring structure has better optical and electrical properties than other structures. At present, the common method for synthesizing precious metal nanorings is to use silver nanosheets as a sacrificial hard template to synthesize nanorings through galvanic reaction. The nanorings prepared by this method have rough surfaces and cannot be controlled to obtain smooth nanorings. In addition, photol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/00B22F9/24
Inventor 杨云韩淑华邹超张礼杰黄少铭
Owner WENZHOU UNIVERSITY
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