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Method for quickly preparing high-yield gold triangular nanoprisms

A technology of gold nano and triangular sheets, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problem of poor repeatability and controllability of experiments, large size of gold nanotriangular sheets, cumbersome steps, etc. problems, to achieve the effect of shortening the synthesis time, difficult conditions to control, and cumbersome synthesis steps

Inactive Publication Date: 2015-01-28
SUZHOU UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, the gold nanotriangular sheets obtained by these synthetic methods are generally larger in size (greater than 100nm) and the yield is low (less than 40)
In 2014, Luis M. Liz-Marzán's research group obtained gold nanotriangular sheets with higher yield and uniform size by purifying the product obtained by the improved seed-induced growth method, but there are still a large number of irregularities in the unpurified product. Shaped nanoparticles are formed, and the seed synthesis method still has the disadvantages of cumbersome steps, poor experimental repeatability and controllability, and long time consumption. Therefore, the development of an efficient and rapid synthesis method is the basis for the practical application of triangular gold nanosheets.

Method used

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  • Method for quickly preparing high-yield gold triangular nanoprisms
  • Method for quickly preparing high-yield gold triangular nanoprisms
  • Method for quickly preparing high-yield gold triangular nanoprisms

Examples

Experimental program
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Embodiment 1

[0027] In this embodiment, the quaternary ammonium chloride salt is cetyltrimethylammonium chloride, the soluble iodide ion solution is potassium iodide solution, and the alkali solution is sodium hydroxide solution. The steps are:

[0028] (1) Pipette 1.6mL (0.1M) of cationic surfactant quaternary ammonium chloride into 8mL of ultrapure water, add 80μL (25.4mM) tetrachloroauric acid solution, and then add 75μL (0.01M) of potassium iodide solution , followed by adding 20.3 μL (0.1M) sodium hydroxide solution and shaking until the mixture is uniform.

[0029] (2) Add 100 μL (64 mM) reducing agent ascorbic acid solution to the solution obtained in step (1), shake until the reaction is uniform, and obtain a colorless transparent solution. Then add 5 μL (0.1M) sodium hydroxide solution, shake for 1-2 seconds to make it even, and then let it stand for a reaction.

[0030] The growth changes of gold nanotriangular sheets prepared by the synthesis method of gold nanotriangular shee...

Embodiment 2

[0033] In this example, by adjusting the amount of 64mM ascorbic acid between 60 μL and 160 μL, and reducing the amount of 0.1 M base required for the induction reaction between 10 μL and 5 μL, different sizes of gold nanotriangular sheets were obtained.

[0034] image 3 It is a comparison chart of ultraviolet-visible absorption spectra of gold nanotriangular sheets of different sizes prepared in this embodiment. From image 3 It can be seen that the characteristic plasmon resonance peaks of gold nanotriangular sheets with different sizes range from 620nm to 700nm, indicating that the size of gold nanosheets determines its SPR properties. Figure 4 a-4f are transmission electron micrographs of gold nanotriangular sheets of different sizes prepared in this embodiment, respectively.

[0035] In conjunction with the foregoing examples, it can be seen that the rapid preparation method of the high-yield gold nanotriangular sheet of the present invention only needs about 8 minute...

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Abstract

The invention relates to a method for quickly preparing high-yield gold triangular nanoprisms. The method comprises the following steps of adding chloroauric acid solution and soluble iodide ion solution into a cationic surface active agent, namely quaternary ammonium chloride solution, taking ascorbic acid as a reducing agent, and adding aqueous alkali to regulate a pH value to induce the growth of the gold triangular nanoprisms with ascorbic acid as a reducing agent . According to the method for synthesizing the gold triangular nanoprisms, the gold triangular nanoprisms can be prepared in a very short time (about eight minutes), while for seed growth method-based synthesis of the gold triangular nanoprisms, synthesis steps are complicated, conditions are not easy to control, the repeatability is poor and three to four hours are required for completing the growth of the gold triangular nanoprisms. Therefore, the method has the advantages that the time for synthesizing the gold triangular nanoprisms is greatly shortened, the yield and the morphology uniformity of the obtained gold triangular nanoprisms are improved, the sizes of the gold triangular nanoprisms are adjustable, and a foundation is provided for widely applying the gold nanoprisms.

Description

technical field [0001] The invention relates to the technical field of nanometer materials, in particular to a rapid preparation method of gold nanotriangular sheets with high yield. Background technique [0002] When the size of the material is reduced to less than 100 nanometers, due to the emergence of quantum effects, small size effects, and surface effects, nanomaterials will exhibit excellent properties that are completely different from bulk materials in many aspects such as mechanics, optics, and magnetism. For example, for gold and silver nanomaterials, due to their excellent surface plasmon resonance (Surface plasmon resonance, SPR) properties, they are widely used in catalysis, information storage, nanomedicine, biosensing, photothermal technology, and imaging enhancement. The field shows great application potential. Studies have shown that the SPR effect of noble metal nanomaterials is closely related to the shape and size of the metal material itself. How to re...

Claims

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Application Information

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IPC IPC(8): B22F9/24B22F1/00B82Y30/00B82Y40/00
Inventor 张桥陈磊吉飞徐勇靡逸凡孙宝全叶兴晨张晓宏
Owner SUZHOU UNIV
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