Preparation method of nanogold

A nano-gold and nano-structure technology, applied in nanotechnology, nanotechnology, metal processing equipment, etc., can solve the problems of single gold nanocrystal structure and inconspicuous plasmon coupling effect, and achieve surface-enhanced Raman scattering signal Strong, adjustable nano-gold shell size, broad market prospects

Active Publication Date: 2020-07-28
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The gold nanocrystals prepared by the prior art have a single structure, and the plasmon coupling effect is not obvious. Therefore, it is of great significance to develop and prepare new gold nanocrystals.

Method used

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  • Preparation method of nanogold

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Embodiment 1

[0042] The preparation method of nano gold of the present embodiment comprises the following steps:

[0043] Step 1: Prepare the Gold Seeds

[0044] Take 4ml of 0.2mol cetyltrimethylammonium bromide solution, 500 μl of 5mmol chloroauric acid solution and 600 μl of 10mmol sodium borohydride solution, and carry out magnetic stirring reaction, the time of magnetic stirring reaction is 1.5h, The rotating speed is 1000 rev / min, and gold seeds are obtained.

[0045] Step 2: Preparation of nano-gold sphere colloidal solution

[0046] 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 8000 rpm for 4min, and the precipitate was collected and dispersed into 40ml of deionized water to obtain a colloidal solution of gold nanospheres. ...

Embodiment 2

[0057] The preparation method of nano gold of the present embodiment comprises the following steps:

[0058] Step 1: Prepare the Gold Seeds

[0059] Take 4ml of 0.15mol cetyltrimethylammonium bromide solution, 500μl of 4mmol chloroauric acid solution and 600μl of 8mmol sodium borohydride solution, and carry out magnetic stirring reaction. The time of magnetic stirring reaction is 2h, and the rotation speed At 1000 rpm, gold seeds were obtained.

[0060] Step 2: Preparation of nano-gold sphere colloidal solution

[0061] 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 0.8h, 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.

[0...

Embodiment 3

[0072] The preparation method of nano gold of the present embodiment comprises the following steps:

[0073] Step 1: Prepare the Gold Seeds

[0074] Take 4ml of 0.25mol cetyltrimethylammonium bromide solution, 500 μl of 6mmol chloroauric acid solution and 600 μl of 12mmol sodium borohydride solution, and carry out magnetic stirring reaction, the time of magnetic stirring reaction is 2.5h, The rotating speed is 1000 rev / min, and gold seeds are obtained.

[0075] Step 2: Preparation of nano-gold sphere colloidal solution

[0076] 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 1.2mol sodium hydroxide was reacted at 33°C for 1.2h, then centrifuged at 8000 rpm for 4min, and the precipitate was collected and dispersed in 40ml of deionized water to obtain a colloidal solution of gold nanospheres.

[...

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Abstract

The invention discloses a preparation method of nanogold, and belongs to the technical field of inorganic nano material preparation. The preparation method of the nanogold comprises the following steps of 1, preparing gold seeds; 2, preparing a nanogold ball colloidal solution; 3, preparing an Au@PbS core-shell heterogeneous nano material aqueous solution; 4, preparing an Au / Pbs / Au nano structuresolution; and 5, preparing the nanogold. The nanogold prepared through the method has excellent performance of a stable structure, an adjustable nanogold shell layer size, an obvious plasmon couplingeffect, a strong surface enhancement Raman scattering signal and the like, and has important reference significance for the construction of a surface Raman enhancer.

Description

technical field [0001] The invention relates to a method for preparing nano gold, belonging to the technical field of inorganic nano material preparation. Background technique [0002] Metal nanocrystals with plasmonic optical properties have excellent photon absorption, strong localized electromagnetic field and other properties, and show great application potential in the field of surface Raman enhanced scattering. Metal nanocrystals with different structures, such as nanospheres, nanorods, nanotriangular plates, nanostars, etc., have been prepared and widely used in the ultrasensitive detection of surface-enhanced Raman scattering. The plasmon coupling effect between metals has been confirmed to have higher photon absorption efficiency and stronger local electromagnetic field enhancement effect, so that stronger surface Raman enhanced scattering signals can be realized. [0003] The gold nanocrystals prepared by the prior art have a single structure, and the plasmon coup...

Claims

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Application Information

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IPC IPC(8): B22F9/24B22F1/00B82Y30/00B82Y40/00G01N21/65
CPCB22F9/24B82Y40/00B82Y30/00G01N21/658B22F1/07
Inventor 马良陈友龙陈相柏
Owner WUHAN INSTITUTE OF TECHNOLOGY
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