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A kind of preparation method of ring-shaped au nano-circle

A nano-ring technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the irregular structure of Au nano-rings, easy cracking of nano-rings, small size of Au nano-rings, etc. problems, to achieve the effects of controllable product morphology, easy implementation of regulation conditions and means, and easy large-scale synthesis

Active Publication Date: 2022-04-01
HEBEI UNIV OF ENG
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  • Claims
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Problems solved by technology

[0003] The size of the Au nanoring obtained by this preparation method is small, the side length of the ring is 18-38nm, and the thickness of the ring is 7-18nm. The structure of the Au nanoring is irregular and unstable, which is not conducive to preservation and use.
Therefore, the reported Au nanorings have problems such as small size, unstable structure, easy cracking, and inconvenient storage and use.

Method used

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  • A kind of preparation method of ring-shaped au nano-circle
  • A kind of preparation method of ring-shaped au nano-circle
  • A kind of preparation method of ring-shaped au nano-circle

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Embodiment 1

[0048] The present embodiment provides a method for preparing a ring-shaped Au nano-circle, which comprises the following steps:

[0049] Step 1: Weigh 324mg of ferric chloride, 12mg of ammonium dihydrogen phosphate, and 78mg of sodium sulfate, add 100mL of ultrapure water, transfer the above mixture to a 150mL stainless steel hydrothermal kettle, heat to 200°C for 24 hours, separate and wash, and add the product to 100mL ultrapure water and 4mL polyacrylic acid aqueous solution (M W =1800, 7.2mg / mL), stirred by a magnet for 12h, washed by centrifugation, and dispersed in 30mL ultrapure water (about 5mg / mL). ring-shaped Fe 2 o 3 nano ring ( figure 1 shown).

[0050] figure 1 For the Fe obtained in Example 1 2 o 3 TEM image of the nanoring, Fe 2 o 3 The average outer diameter, inner diameter, wall thickness and height of the nano rings are 215nm, 115nm, 50nm and 115nm respectively.

[0051] Take 50mg Ring Fe 2 o 3 Add 15mL of ultrapure water, 100mL of absolute ethan...

Embodiment 2

[0059] The present embodiment provides a method for preparing a ring-shaped Au nano-circle, which comprises the following steps:

[0060] Step 1: Weigh 324mg of ferric chloride, 12mg of ammonium dihydrogen phosphate, and 78mg of sodium sulfate, add 100mL of ultrapure water, transfer the above mixture to a 150mL stainless steel hydrothermal kettle, heat to 200°C for 24 hours, separate and wash to obtain Fe 2 o 3 nano ring. Add 100mL ultrapure water and 4mL polyacrylic acid aqueous solution (M W =1800, 7.2mg / mL), stirred by a magnet for 12h, washed by centrifugation, and dispersed in 30mL ultrapure water (about 5mg / mL). Take 50mg Fe 2 o 3 Add 15mL of ultrapure water, 100mL of absolute ethanol, 5mL of ammonia water, and 50μL of ethyl orthosilicate to react at room temperature for 30min, then centrifuge and wash with ethanol to obtain Fe 2 o 3 @SiO 2 nano ring. SiO 2 The thickness is about 5nm.

[0061] The second step: take 25mg of the above Fe 2 o 3 @SiO 2 Add 30mL ...

Embodiment 3

[0067] The present embodiment provides a method for preparing a ring-shaped Au nano-circle, which comprises the following steps:

[0068] Step 1: Weigh 324mg of ferric chloride, 12mg of ammonium dihydrogen phosphate, and 78mg of sodium sulfate, add 100mL of ultrapure water, transfer the above mixture to a 150mL stainless steel hydrothermal kettle, heat to 200°C for 24 hours, separate and wash to obtain Fe 2 o 3 nano ring. Add 100mL ultrapure water and 4mL polyacrylic acid aqueous solution (M W =1800, 7.2mg / mL), stirred by a magnet for 12h, washed by centrifugation, and dispersed in 30mL ultrapure water (about 5mg / mL). Take 50mg Fe 2 o 3 Add 15mL of ultrapure water, 100mL of absolute ethanol, 5mL of ammonia water, and 30μL of tetraethyl orthosilicate to react at room temperature for 30min, then centrifuge and wash with ethanol to obtain Fe 2 o 3 @SiO 2 nano ring. SiO 2 The thickness is about 2nm.

[0069] The second step: take 25mg of the above Fe 2 o 3 @SiO 2 Add ...

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Abstract

The invention relates to a method for preparing a ring-shaped Au nano-circle, belonging to the field of synthesis of noble metal nano-materials. The preparation method of the ring-shaped Au nano-circle of the present invention is based on ring-shaped Fe 2 o 3 The nano-ring is the internal rigid template, and the Fe 2 o 3 Au nanoseeds are modified on the surface of the nano ring, and the surface is covered with a phenolic resin shell as the outer template of the network structure; the Fe 2 o 3 Etch away, then add chloroauric acid and reducing agent under the condition of polymer surfactant, react for a certain period of time at room temperature, the generated nano-gold particles are deposited and grown with Au nano-seeds as the nucleus, and finally etched away with caustic alkali The phenolic resin shell layer is prepared to obtain ring-shaped Au nano-rings. The ring-shaped Au nano-circle prepared by the invention has a regular structure size, and the thickness and size can be adjusted.

Description

technical field [0001] The invention relates to the technical field of synthesis of noble metal nanomaterials, in particular to a method for preparing a ring-shaped Au nano-circle. Background technique [0002] Metal nanomaterials have special small-scale structures, so they have many specific electrical, mechanical, optical, magnetic and other properties. Noble metal nanomaterials have attracted much attention due to their wide applications in photocatalysis, photodetection, electrocatalysis, chemical and biological sensing, biomedicine, optics, etc. These special properties are closely related to the size, morphology, chemical composition and crystal phase of noble metal nanomaterials. In recent years, gold nanomaterials with different morphologies have aroused great interest. By adjusting the composition ratio of precursors and the types of surface adsorbents, direct growth method, soft template method, hard template method and other methods have been synthesized. Gold ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24B22F1/054B22F1/18B82Y30/00B82Y40/00
CPCB22F9/24B82Y30/00B82Y40/00B22F1/054B22F1/07
Inventor 张晓亮武春霞杨文姝童林陈仲
Owner HEBEI UNIV OF ENG
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