Method for rapidly synthesizing nanogold quantum dot through dual reducing agent at indoor temperature

A room temperature synthesis and reducing agent technology, applied in the field of room temperature synthesis, can solve problems such as difficult control, slow reaction speed, high temperature, etc., and achieve the effect of saving time cost, saving energy cost, and reducing danger

Inactive Publication Date: 2015-12-23
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the reaction of chemical methods requires high temperature, and the reaction speed is slow, and it is difficult to control and other problems, which are difficult to overcome.

Method used

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  • Method for rapidly synthesizing nanogold quantum dot through dual reducing agent at indoor temperature
  • Method for rapidly synthesizing nanogold quantum dot through dual reducing agent at indoor temperature
  • Method for rapidly synthesizing nanogold quantum dot through dual reducing agent at indoor temperature

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A kind of double reducing agent carries out the rapid synthesis method of nano gold quantum dot at room temperature, comprising the following steps:

[0036] 1. Prepare the solution:

[0037] Chlorauric acid (HAuCl 4 ) solution (0.05mg / mL), sodium citrate (Na 3 C 6 h 5 o 7 ) solution (5mg / mL), ascorbic acid (C 6 h 8 o 6 ) solution (5mg / mL).

[0038] 2. Experimental steps:

[0039] 21. At room temperature, add 1.0 mL of sodium citrate solution to 50 mL of chloroauric acid solution (0.05 mg / mL);

[0040] 22. Add 0.6mL of ascorbic acid solution at one time while stirring;

[0041] 23. The solution turns pink after about 2 seconds, then gradually darkens, and finally turns purple (about 2-3 seconds), indicating that the reaction is complete.

[0042] 24. Carry out high-resolution TEM analysis on the obtained product, the interplanar spacing is 0.2298 nanometers, it can be determined that it is a polycrystalline gold element ( figure 2 a), the measured crystal f...

Embodiment 2

[0044] Method is with reference to embodiment 1, but changes as follows:

[0045] 22. Change the dosage of ascorbic acid, respectively 0.4mL, 0.6mL, 1.0mL. The following table shows the statistical results of the product nanogold obtained by changing the experimental conditions.

[0046] Comparison of average particle size and particle size standard deviation of gold nanoparticles prepared under different ascorbic acid dosage conditions

[0047]

[0048] Conclusion: Other preparation conditions remain the same, when the amount of ascorbic acid increases, the particle size of gold nanoparticles increases, the reason is that the reduction speed is accelerated and the nucleation speed of nanoparticles is increased. Therefore, the particle size of gold nanoparticles can be controlled by controlling the concentration of ascorbic acid.

Embodiment 3

[0050] Method is with reference to embodiment 1, but changes as follows:

[0051] 21. Change the dosage of sodium citrate to 0.2mL, 0.5mL and 1.0mL respectively. The following table shows the statistical results of the product nanogold obtained by changing the experimental conditions.

[0052] Comparison of average particle size and particle size standard deviation of gold nanoparticles prepared under different sodium citrate dosage conditions

[0053]

[0054] Conclusion: Other experimental conditions remain the same. When the amount of sodium citrate increases, the particle size of gold nanoparticles decreases. The reason is that citrate not only acts as a reducing agent in this reaction, but also acts as a blocking agent. A protective layer is formed on the surface of the particles, which prevents further growth of the gold nanoparticles. Therefore, the particle size of gold nanoparticles can be controlled by adjusting the amount of sodium citrate.

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Abstract

The invention discloses a method for rapidly synthesizing a nanogold quantum dot through a dual reducing agent at the indoor temperature. The method comprises the steps that sodium citrate and ascorbic acid act on a chloroauric acid weak solution at the same time; and a reduction reaction of gold ions in the solution can be completed during tens of seconds, and the dimension of a product is approximately 1-30 nanometers. According to the rapid synthesis method for the nanogold quantum dot through the dual reducing agent at the indoor temperature, the particle dimension is small, the reaction is fast, the operation is simple and easy to control, the cost is low, and the method is a gold nanoparticle synthesis method.

Description

technical field [0001] The invention relates to a method for synthesizing nano-gold quantum dots at room temperature by using double reducing agents. Background technique [0002] Quantum dots are usually nanoparticles composed of semiconductor materials (group II-VI or group III-V elements), and the three dimensions of space are all between 1-100nm. Quantum dots are a special semiconductor nanostructure, which can bind conduction band electrons, valence band holes and excitons in three spatial directions, and the movement of internal electrons in all directions is restricted, so the quantum confinement effect very significant. [0003] Quantum dots can be divided into spherical quantum dots, tetrahedral quantum dots, cubic quantum dots, box-shaped quantum dots, cylindrical quantum dots, disk-shaped quantum dots and external field (electric and magnetic field) induced quantum dots according to their geometric shapes; Composition of materials, quantum dots can be divided in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24
Inventor 谢骁张澄贾海洋孙立涛
Owner SOUTHEAST UNIV
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