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Method for dispersing and/or purifying gold nanosheets

A nano-gold and gold flake technology, applied in the field of materials, can solve the problems of low purification efficiency, harsh conditions, complicated steps, etc., and achieve the effects of high purification yield, short reaction period and simple operation process.

Inactive Publication Date: 2016-03-23
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the disadvantages of harsh conditions, cumbersome steps, and low purification efficiency in the above methods,

Method used

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  • Method for dispersing and/or purifying gold nanosheets
  • Method for dispersing and/or purifying gold nanosheets
  • Method for dispersing and/or purifying gold nanosheets

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Embodiment 1, utilizing compound C shown in formula I 18 N 5 Dispersed gold nano flakes

[0030] The crude product of nano-gold flakes was centrifuged and washed three times under the condition of 3000g and 5min (see figure) to remove excess C in the preparation process. 18 N 3 , to the centrifuged product, the concentration of 5mM C shown in formula I was added 18 N 5 aqueous solution, 600W power ultrasonic 30s, get a good dispersion system of nano-gold flakes, see figure 1 .

[0031]

[0032] Depend on figure 1 It can be seen that the crude product of the nano-gold flakes washed by centrifugation for many times is in low concentration (5mM) 18 N 5 It is completely dispersed in aqueous solution.

[0033] Wherein, the crude product of nano-gold sheet is prepared according to the following method:

[0034] (1) Prepare 20 mL of 0.5 M ammonium chloride aqueous solution.

[0035] (2) Add 1.56mL of 5mM C to aqueous ammonium chloride solution 18 N 3 aqueous solu...

Embodiment 2

[0040] Embodiment 2, utilizing compound C shown in formula I 18 N 5 Purified gold nanosheets

[0041] To Example 1 obtained with C 18 N 5 In the dispersed gold nanosheet system (in the form of C 18 N 5 The concentration is 5mM as an example) add NaOH solution (1.0M, 30μL), adjust the pH value of the solution to 12.0, and let it stand at room temperature for 10min, you can see that there is precipitation at the bottom of the container, and the color of the upper solution (nanospheres and nanopolyhedra suspended in it) shallow. Suck off the supernatant, add 2mL of water to the lower layer of sediment, and after ultrasonic dispersion, the obtained nano-gold flake solution is centrifuged and washed once (3000g, 5min) to remove the used NaOH and excess surfactant C in the purification process. 18 N 5 , the centrifuged product is the purified gold nanosheets, see figure 2 (b).

[0042] As shown in the figure, the purified gold nanosheets ( figure 2 (b)) and gold nanoshee...

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Abstract

The invention relates to a method for dispersing and / or purifying gold nano-sheets, in particular to a method for applying octadecyl-substituted triazole polyamine head tree-like molecules (C18N5) to dispersion and / or purification of the gold nano-sheets. The diameter of the gold nano-sheets is 500-1,000nm, and the thickness of the gold nano-sheets is 40-80nm. A surfactant C18N5 serves as a good protective agent, and the gold nano-sheets can be well dispersed under the condition of low concentration. Meanwhile, due to the fact that the C18N5 has excellent acid-base responsiveness, the gold nano-sheets can be separated from a solution of a mixture containing gold nano-particles, nano-polyhedrons and the like in a high-efficiency and high-yield mode by further regulating the pH value of the solution. The method has the advantages that the operation process is simple, and the reaction time is short; moreover, the reaction conditions are mild, and the operation can be carried out at normal temperature; in addition, needed raw materials are simple and are easily obtained, the purification yield is high, the repeatability is high, and the method has a great application prospect.

Description

technical field [0001] The invention belongs to the field of materials and relates to a method for dispersing and / or purifying nano gold flakes. Background technique [0002] In recent years, with the continuous development of electronic technology, noble metal micro / nano materials have received extensive attention in many research fields due to their unique optical, electrical, acoustic, magnetic and mechanical properties, especially some non-spherical noble metals Micro / nanomaterials, such as rods, flakes, filaments, tubes, dendrites, etc., have attracted great attention from researchers due to their good optical, electrical, and catalytic properties. So far, researchers have explored a variety of methods for preparing nanomaterials with various shapes, but the synthesis of non-spherical nanomaterials with high yield and good monodispersity still faces great challenges. Since the follow-up research of nanomaterials, such as biological detection and assembly, has high requ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24B01F3/12
Inventor 江龙郝敏佳鲁闻生
Owner INST OF CHEM CHINESE ACAD OF SCI