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Preparation method of gold nano-flowers

A gold nanoflower, gold preparation technology, applied in nanotechnology, nanotechnology, metal processing equipment and other directions, can solve the limitations of surface-enhanced Raman practical application performance, single metal nanocrystal morphology, less plasmonic electromagnetic hotspots and other problems, to achieve the effects of abundant electromagnetic hot spots, adjustable number of petals, and simple preparation method

Inactive Publication Date: 2021-08-06
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the reported metal nanocrystals have single morphology and few plasmonic electromagnetic hotspots, which greatly limit the practical application performance of surface-enhanced Raman.
In addition, common metal nanocrystals have limited molecular adsorption capacity, which makes it difficult to detect ultra-low concentration Raman molecules.

Method used

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  • Preparation method of gold nano-flowers
  • Preparation method of gold nano-flowers

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Experimental program
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Effect test

Embodiment 1

[0034] The preparation method of gold nanoflowers in this embodiment comprises the following steps:

[0035] Step 1: Prepare the Gold Seeds

[0036] Take 8ml of 0.1mol cetyltrimethylammonium bromide solution, 500μl of 0.05mmol chloroauric acid solution and 600μl of 0.01mmol sodium borohydride solution, and carry out magnetic stirring reaction, and the time of magnetic stirring reaction is 1.5 h, the rotating speed is 1000 rpm, and the gold seeds are obtained.

[0037] Step 2: Preparation of gold nanosphere colloidal solution

[0038] In 40 μ l of the gold seeds obtained in step 1, add a mixed solution of 30 ml of 0.2 mol cetyltrimethylammonium bromide solution, 6 ml of 5 mmol chloroauric acid solution and 3.5 ml of 10 mmol ascorbic acid solution, and then add 1ml of 1mol sodium hydroxide was reacted at 33°C for 1h, then centrifuged at 8000rpm for 4min, and the precipitate was collected and dispersed into 40ml of deionized water to obtain a colloidal solution of gold nanosphe...

Embodiment 2

[0054] The preparation method of gold nanoflowers in this embodiment comprises the following steps:

[0055] Step 1: Prepare the Gold Seeds

[0056] Get 8ml of 0.08mol cetyl trimethylammonium bromide solution, 500 μl of 0.04mmol chloroauric acid solution and 600 μl of 0.008mmol sodium borohydride solution, and carry out magnetic stirring reaction, the time of magnetic stirring reaction is 1.5 h, the rotating speed is 1000 rpm, and the gold seeds are obtained.

[0057] Step 2: Preparation of gold nanosphere colloidal solution

[0058] In 40 μ l of the gold seeds obtained in step 1, add a mixed solution of 30 ml of 0.15 mol cetyltrimethylammonium bromide solution, 6 ml of 4 mmol chloroauric acid solution and 3.5 ml of 8 mmol ascorbic acid solution, and then add 1ml of 0.8mol sodium hydroxide was reacted at 33°C for 1h, then centrifuged at 8000 rpm for 4min, and the precipitate was collected and dispersed into 40ml of deionized water to obtain a colloidal solution of gold nanos...

Embodiment 3

[0069] The preparation method of gold nanoflowers in this embodiment comprises the following steps:

[0070] Step 1: Prepare the Gold Seeds

[0071] Get 8ml of 0.12mol cetyl trimethylammonium bromide solution, 500 μl of 0.06mmol chloroauric acid solution and 600 μl of 0.012mmol sodium borohydride solution, and carry out magnetic stirring reaction, the time of magnetic stirring reaction is 1.5 h, the rotating speed is 1000 rpm, and the gold seeds are obtained.

[0072] Step 2: Preparation of gold nanosphere colloidal solution

[0073] In 40 μl of the gold seeds obtained in step 1, add a mixed solution of 30ml of 0.25mol cetyltrimethylammonium bromide solution, 6ml of 6mmol chloroauric acid solution and 3.5ml of 12mmol ascorbic acid solution, and then add 1ml of 1mol sodium hydroxide was reacted at 33°C for 1h, then centrifuged at 8000rpm for 4min, and the precipitate was collected and dispersed into 40ml of deionized water to obtain a colloidal solution of gold nanospheres. ...

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Abstract

The invention discloses a preparation method of gold nano-flowers, and belongs to the technical field of inorganic nano-material preparation. The preparation method of the gold nano-flowers comprises the following steps of the step 1, preparing gold seeds; the step 2, preparing a gold nano-sphere colloidal solution; the step 3, preparing an Au@PbS core-shell heterogeneous nano-material aqueous solution; the step 4, preparing an Au / PbS / Au nano-structure solution; and the step 5, preparing the gold nano-flowers. The prepared gold nano-flowers have the advantages of being stable in structure, adjustable in number of petals, abundant in plasmon electromagnetic hot spot, excellent in surface enhanced Raman scattering performance and the like, and are expected to be applied to detection of pesticide residues and viruses.

Description

technical field [0001] The invention relates to a preparation method of gold nanoflowers, which belongs to the technical field of preparation of inorganic nanomaterials. Background technique [0002] Plasmonic metal nanocrystals have the characteristics of excellent photon absorption and large electromagnetic field enhancement, showing great application potential in the field of surface-enhanced Raman spectroscopy, and are widely used in ultrasensitive detection of molecules, viruses, and pesticides. However, the reported metal nanocrystals have single morphology and few plasmonic electromagnetic hotspots, which greatly limit the practical application performance of surface-enhanced Raman. In addition, common metal nanocrystals have limited molecular adsorption capacity, which makes it difficult to detect ultra-low concentration Raman molecules. Contents of the invention [0003] The purpose of the present invention is to overcome the deficiencies of the prior art and pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B22F1/00B22F1/02B82Y30/00B82Y40/00
CPCB22F9/24B82Y30/00B82Y40/00B22F1/0553B22F1/07B22F1/17B22F1/054
Inventor 康淏森陈子怡瞿书舟段懿桐陈友龙邹静雯马良陈相柏
Owner WUHAN INSTITUTE OF TECHNOLOGY
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