Method for preparing flower-like gold nanoparticles controllably

A gold nanoparticle, flower-like technology, applied in the field of nanomaterial preparation, can solve the problems of complex preparation process and conditions, and achieve the effect of simple operation

Inactive Publication Date: 2013-11-27
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although there have been the above methods for preparing flower-shaped gold nanoparticles, however, due to the existing methods in the reaction process of preparing flower-shaped gold nanoparticles, it is generally necessary to add surface modifiers or templates to make the preparation process and conditions complicated, or require Under high temperature conditions, or with special equipment

Method used

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  • Method for preparing flower-like gold nanoparticles controllably
  • Method for preparing flower-like gold nanoparticles controllably
  • Method for preparing flower-like gold nanoparticles controllably

Examples

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Effect test

preparation example Construction

[0022] Preparation of spherical Au seeds

[0023] 20 nm spherical gold nanoparticles were prepared by the citrate reduction method. The specific method is 50ml of HAuCl 4 The solution (0.24mM) was heated to boiling and maintained for 15 minutes, then 1ml of sodium citrate (1%) was added quickly, and kept boiling for 20 minutes, the solution turned wine red. Finally, the solution is cooled to room temperature under stirring, which is the obtained spherical gold nanoparticle seed A 0 .

Embodiment 1

[0025] Preparation of gold nanoflowers

[0026] step 1)

[0027] 10 ml of seed crystal A under vigorous stirring 0 Add to 25ml of deionized water; then, add 0.5ml of ascorbic acid (1M); then quickly add 0.5ml of HAuCl 4 Solution (24mM); keep stirring at 5000r / min for 30min, add 0.25ml of sodium citrate solution (1%), stop stirring; obtain mixture A. The mixture was centrifuged and then dispersed in deionized water, such as figure 1 Shown is the scanning electron micrograph of the product that present embodiment step (1) obtains, by figure 1 It can be seen that the morphology of the gold nanoparticles prepared in step (1) of this example is spherical.

[0028] step (2)

[0029] Add 9ml of A to 25ml of deionized water under vigorous stirring; then, add 0.5ml of ascorbic acid (1M); then quickly add 0.5ml of HAuCl 4 Solution (24mM); keep stirring at 5000r / min for 30min, add 0.25ml of sodium citrate solution (1%), stop stirring; obtain mixture B. The mixture was centrifuged ...

Embodiment 2

[0035] Preparation of gold nanoflowers

[0036] 3 ml of seed A under vigorous stirring 0 Add to 25ml of deionized water; then, add 0.3ml of sodium hydroxide (1M); then quickly add 0.5ml of HAuCl 4 solution (24mM); keep stirring at a rotational speed of 5500r / min for 25min, add 0.25ml of sodium citrate solution (1%), and stop stirring; a mixture is obtained. The mixture was centrifuged and then dispersed in deionized water, such as Figure 5 Shown is the scanning electron micrograph of the product that the present embodiment obtains, by Figure 5 It can be seen that the morphology of the gold nanoparticles prepared in this example is flower-like.

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Abstract

The invention discloses a method for preparing flower-like gold nanoparticles. The method comprises the steps as follows: a spherical gold nanoparticle seed solution, chloroauric acid, a reducing agent and a protective agent with a surface modification effect are taken as reaction reagents; at the temperature of 20 DEG C-40 DEG C, 1 ml-10 ml of the spherical gold nanoparticle seed solution is extracted, added to 10 ml-30 ml of deionized water and stirred rapidly; a certain amount of chloroauric acid solution is added, and then a reducing agent solution is added; stirring is performed continuously and then stopped, so that a gold sol solution is obtained; a protective agent is added to the gold sol solution; the process is operated for one time or operated continuously and repeatedly for 2-4 times; and in the process repeated for many times, a seed solution obtained each time is a gold sol solution obtained in a former step, and finally the flower-like gold nanoparticles are prepared. Compared with the prior art, by the aid of a reduction reaction, the chloroauric acid is reduced, and the flower-like gold nanoparticles are prepared; and a special device is not required to be used, a high-temperature environment is also not required, and the operation is simple.

Description

technical field [0001] The invention mainly relates to a method for controllably preparing flower-shaped gold nanoparticles, which belongs to the technical field of nanomaterial preparation. Background technique [0002] Compared with bulk gold materials, gold nanoparticles have been widely used in the fields of sensing and analysis due to their unique optical, electrical and catalytic properties. Since its performance is greatly affected by the shape and size of nanoparticles, researchers have been working on the preparation of gold nanoparticles with controllable shape and size. [0003] Among them, the preparation of flower-shaped gold nanoparticles is particularly attractive. Due to the rough surface of flower-shaped gold nanoparticles and the special electromagnetic field effect on the branches, it has great potential in the fields of surface-enhanced Raman scattering, biomedicine, environmental analysis and catalysis. Very wide application value. Due to these special...

Claims

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Application Information

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IPC IPC(8): B22F9/24B82Y40/00
Inventor 董前民杨艳敏黄杰梁培王乐
Owner CHINA JILIANG UNIV
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