Precious metal nanoring and preparation method thereof

A nano-ring, precious metal technology, applied in the field of precious metal nano-ring and its preparation, can solve the problems of low product purity, uncontrollable high selective growth of Pt, etc.

Inactive Publication Date: 2015-12-09
WENZHOU UNIVERSITY
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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.ACSNano,2012,6,4072-4082), however, due to the inability to control the highly selective growth of Pt on the outer edge of the Au decahedron , 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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  • Precious metal nanoring and preparation method thereof
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  • Precious metal nanoring 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 above-mentioned noble metal nanorings, which includes:

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

[0033] Step B, preparing noble metal nanorings: adding M source and reducing agent II to the Au material template liquid, mixing them evenly, and then reacting to prepare noble metal nanorings.

[0034] In a specific embodiment of the present invention, in step A, the Au nanomaterial template solution prepared by performing the reaction (under aerobic conditions) in the Au nanomaterial mixed reaction system. The Au nanomaterial template liquid contains decahedral Au nanoparticle seeds protected by a protective agent, a...

Embodiment 1

[0086] Embodiment 1: Preparation of Au nanomaterial template solution containing Au decahedral nanoparticles

[0087] Mix 20mL polyalcohol with 0.4mL polydiallyldimethylammonium chloride of a certain concentration and molecular weight and stir evenly, add 5mg of dried HAuCl 4 , then add 10mgAgNO 3 . After the mixture was evenly stirred, the solution was reacted in an oil bath for 30 minutes, and the size of the decahedron could be adjusted by controlling the reaction temperature.

[0088] Described polyhydric alcohol is ethylene glycol, glycerol, pentylene glycol etc.

[0089] The polydiallyldimethylammonium chloride has a molecular weight of 200,000-1,000,000.

[0090] The mass concentration of the polydiallyl dimethyl ammonium chloride is 20% to 35%.

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

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

Embodiment 2

[0093] Embodiment 2: Preparation of Au nanomaterial template solution containing Au nanosheets

[0094] Mix 20mL polyalcohol with 0.4mL polydiallyldimethylammonium chloride of a certain concentration and molecular weight and stir evenly, add 5mg of dried HAuCl 4 , then add 10mgAgNO 3 . After the mixed solution was evenly stirred, nitrogen gas was passed for 30 minutes to remove oxygen in the solution, and then nitrogen gas was continued to react in the oil bath for 30 minutes. The size of the Au nanosheets could be adjusted by controlling the reaction temperature.

[0095] Described polyhydric alcohol is ethylene glycol, glycerol, pentylene glycol etc.

[0096] The polydiallyldimethylammonium chloride has a molecular weight of 200,000-1,000,000.

[0097] The mass concentration of the polydiallyl dimethyl ammonium chloride is 20% to 35%.

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

[0099] The temperature of the oil ...

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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 noble metal nanomaterials, in particular to a noble metal nanoring and a preparation method thereof. Background technique [0002] Noble metal nanostructures have good application prospects in catalysis, biomedicine and other fields, so they have attracted the attention of researchers all over the world. [0003] The physical and chemical properties of noble metal nanostructures are closely related to their morphology, and the ring structure of noble metal 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 of synthesizing noble metal nanorings is to use silver nanosheets as a sacrificial hard template and synthesize nanorings through galvanic reaction. The nanorings prepared by this method have rough surfaces, and cannot be adjusted to obtain smooth nanorings. In addition, photolithography can also be ...

Claims

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Application Information

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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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