Preparation method of polyhedral copper nanoparticle

A technology of copper nanoparticles and nanoparticles, which is applied in the field of nanomaterials, can solve the problem of poor catalytic performance of polyhedral copper nanoparticles, and achieve the effects of excellent catalytic performance, good sample crystallinity, and good stability

Inactive Publication Date: 2012-12-26
JILIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Moreover, most of the current studies on copper nanostructures are copper nanoparticles with irregular morphology, and there are still few studies on polyhedral copper nanoparticles and their catalytic properties.

Method used

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  • Preparation method of polyhedral copper nanoparticle
  • Preparation method of polyhedral copper nanoparticle
  • Preparation method of polyhedral copper nanoparticle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Put 0.0016g of copper oxide powder, 3mL of oleic acid and 3mL of octadecene into a 50mL three-necked flask of the Schlenk system, then plug the two sides of the three-necked flask with rubber stoppers, and connect the middle port to the condenser with condensation. The air vent is filled with nitrogen, and the air in the three-necked bottle is replaced, so that the three-necked bottle is filled with nitrogen, and then the thermocouple is inserted into the liquid surface from the side port of the three-necked bottle, heated and stirred, and the temperature is raised to A clear solution was formed at 245±5°C. Subsequently, 3 mL of oleylamine was added, and the mixed solution turned into brown-red turbidity to form copper nanoparticles, which was the starting point for the growth of copper nanoparticles. After the reaction time was 5 minutes, the sample was extracted and cooled to room temperature naturally, and the sample was washed twice with a mixed solution of methanol...

Embodiment 2

[0035] On the basis of the reaction time of 5 minutes in Example 1, after 10 minutes, that is, the reaction time is 15 minutes, the sample is extracted again and cooled to room temperature, and the sample is washed twice with a mixed solution of methanol and acetone in a volume ratio of 1:1. The copper nano-single crystal particles are obtained.

[0036] Samples grown for 15 minutes were characterized. image 3 is the TEM image of the polyhedral copper nanoparticles obtained when the growth time is 15 minutes, and the average particle size of the copper nanoparticles is 18.0 nanometers. Figure 4is a high-resolution electron microscope image of a single polyhedral copper nanoparticle.

Embodiment 3

[0038] On the basis of the reaction time of Example 2 of 15 minutes, another 25 minutes passed, that is, the reaction time was 40 minutes, and the sample was extracted for the third time and cooled to room temperature naturally, and the sample was washed 2 times with methanol and acetone mixed solution with a volume ratio of 1:1. Copper nano single crystal particles can also be obtained.

[0039] Samples with a growth time of 40 minutes were characterized. Figure 5 It is a transmission electron microscope image of polyhedral copper nanoparticles obtained when the growth time is 40 minutes, and the average particle diameter of copper nanoparticles is 21.5 nanometers after statistics. Image 6 is a high-resolution electron microscope image of a single polyhedral copper nanoparticle. The X-ray diffraction pattern of polyhedral copper nanoparticles is shown in Figure 7 As shown, it is a face-centered cubic structure and has good crystallinity, completely corresponding to the c...

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Abstract

The invention provides a preparation method of a polyhedral copper nanoparticle, and belongs to the technical field of nanometer materials. According to the preparation method provided by the invention, the powdered copper oxide is taken as the copper source, the oleic acid is used as the ligand, and the octadecene is used as a solvent, and oleylamine serving as a reducing agent is poured into the mixture at 240 to 250 DEG C, thus obtaining the copper nanoparticle; and the copper nanoparticle with different shapes and dimensions can be obtained by controlling the reaction time. Compared with existing method, the preparation method of polyhedral copper nanoparticle provided by the invention adopts the powdered copper oxide as the raw material because the powdered copper oxide is low in cost and has high stability in the air; the polyhedral copper nanoparticle manufactured by the method has good stability on ligand protection, and excellent catalyzing performance after being diffused in the water; and the preparation method has the advantages that the time of synthesis is short, high repeatability is achieved, and a sample has high crystallinity, and the uniformity in particle size distribution is ensured.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials, and in particular relates to a preparation method of polyhedral copper nanoparticles, and this type of catalyst exhibits good catalytic performance in catalytic hydrogenation reaction. Background technique [0002] Metal nanomaterials have attracted much attention due to their exotic properties and their broad application prospects in plasmonics, biosensing, catalysis, and surface-enhanced Raman scattering. These properties of metallic nanomaterials mainly depend on their morphology, size, and structure, so being able to control any of these parameters can effectively tune their properties. In recent years, the field of nano-metal catalysis has attracted more and more attention. It is well known that the catalytic activity of nano-metals depends not only on the specific surface area of ​​the particles, but also on the structure and arrangement of the surface atoms. Studies have shown that ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24
Inventor 邹勃张品华隋永明邹广田
Owner JILIN UNIV
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