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Preparation method of gold nanoparticles

A technology of nano-gold particles and nano-gold colloids, which is applied in electricity, can solve the problems of long time, high cost, and easy aggregation of nano-gold particles, and achieve the effects of simple operation, high uniformity and good particle dispersion.

Inactive Publication Date: 2015-09-02
CHENGDU YICHUANGSI BIOLOGICAL SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The particle size of chemically prepared gold nanoparticles can be as small as several nanometers, and the operation is simple and easy to control. The disadvantage is that the obtained gold nanoparticles are prone to aggregation, and are mainly suitable for optics, electricity and biomedicine that require high performance of gold nanoparticles. and other fields
The above chemical preparation methods often need to add a variety of dispersants or stabilizers or flocculants in the preparation, which is costly and time-consuming.

Method used

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  • Preparation method of gold nanoparticles

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Effect test

Embodiment 1

[0053] A kind of preparation method of nano gold particles of the present embodiment, such as figure 1 Shown, mainly realize through following technical scheme: comprise the following steps:

[0054] Step S100: Prepare a chloroauric acid solution with a concentration of 0.05-10 mmol / L;

[0055] Step S200: preparing a HEPES buffer solution with a concentration of 5-50 mmol / L, and adjusting the pH value of the HEPES buffer solution to 7.0-8.0 with sodium hydroxide;

[0056] Step S300: adding a surfactant to the HEPES buffer prepared in step S200 to prepare a surfactant solution with a concentration of 1-2 mmol / L;

[0057] Step S400: introduce the surfactant solution prepared in step S300 into the reaction tank, slowly add the chlorine prepared in step S100 into the reaction tank according to the molar ratio of the chloroauric acid solution and the surfactant solution in the range of 1:1-1:10 Auric acid solution, stirred at a constant speed of 200-300r / min, reacted for 5-30min,...

Embodiment 2

[0061] This embodiment is further optimized on the basis of the above embodiments. Further, the surfactant solution in step S300 refers to the PVP solution. Other parts of this embodiment are the same as those of the foregoing embodiments, so details are not repeated here.

Embodiment 3

[0062] Embodiment 3: This embodiment is further optimized on the basis of Embodiment 2. Further, the step S100 specifically refers to: preparing a chloroauric acid solution with a concentration of 1 mmol / L;

[0063] The step S200 specifically refers to: preparing a HEPES buffer solution with a concentration of 20 mmol / L, and adjusting the pH value of the HEPES buffer solution to 7.4 with sodium hydroxide;

[0064] The step S300 specifically refers to: adding a surfactant to the HEPES buffer prepared in the step S200 to prepare a surfactant solution with a concentration of 1 mmol / L;

[0065] The step S400 specifically refers to: under normal temperature, the surfactant solution prepared in step S300 is introduced into the reaction tank, and the molar ratio of the chloroauric acid solution and the surfactant solution is 1:5-1:10 into the reaction tank. Slowly add the chloroauric acid solution prepared in step S100, and stir at a speed of 250r / min for 10min to obtain a mixed solu...

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Abstract

The invention discloses a preparation method of gold nanoparticles. The preparation method comprises the following steps that a chloroauric acid solution with the concentration of 0.05-10 mmol / L and a HEPES buffer solution with the concentration of 5-50 mmol / L are prepared respectively, and the PH value of the HEPES buffer solution is adjusted to be 7.0-8.0 through sodium hydroxide; surfactants are added into the HEPES buffer solution, and a surfactant solution with the concentration of 1-2 mmol / L is prepared; the prepared chloroauric acid solution is slowly added into a reaction tank according to the mole ratio of 1:1-1: 10 of the chloroauric acid solution and the surfactant solution, and is stirred for 5-30 min at a constant speed of 200-300 r / min, and a mixed solution containing nano gold colloid is obtained; dry purification of the nano gold colloid is carried out on the mixed solution obtained in the step S400, and the gold nanoparticles are obtained. The gold nanoparticles can be prepared at normal temperature, and are good in dispersity and homogeneous degree.

Description

technical field [0001] The invention relates to the technical fields of optics, electricity, biological materials and nanometer materials, and specifically refers to a preparation method of nano gold particles. Background technique [0002] Nanogold has excellent electrical conductivity, good stability, small size effect, surface effect, optical effect and catalytic properties, etc., making it widely used in optical probes, electrochemical probes, sensors, DNA detection glucose sensors, plant protection, pharmaceuticals, etc. Transfer and surface-enhanced Raman scattering have been applied, and its preparation is one of the hotspots of current research. [0003] The preparation methods of nano gold mainly include: physical method and chemical method. Among them, physical methods mainly include vacuum evaporation method, electric dispersion method and laser ablation method. The principle of the physical method is simple, and the obtained product has less impurities and high...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B82Y40/00
Inventor 周洁
Owner CHENGDU YICHUANGSI BIOLOGICAL SCI & TECH
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