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A method for preparing flaky Cu nanocrystals at room temperature

A nanocrystalline and conditional technology, applied in nanotechnology, metal processing equipment, transportation and packaging, etc., can solve the problems of increasing complexity, affecting the application performance of materials, and being difficult to remove, so as to ensure catalytic activity and facilitate industrial production , easy to remove effect

Inactive Publication Date: 2021-06-22
HARBIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantages are: 1) The reaction temperature is too high and the temperature is 160-200 degrees Celsius; 2) The polyvinylpyrrolidone adsorbed on the surface is difficult to remove by simple cleaning, which directly affects the application performance of the material
In addition, the removal step of the soft template during the preparation also increases the complexity of the method

Method used

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  • A method for preparing flaky Cu nanocrystals at room temperature
  • A method for preparing flaky Cu nanocrystals at room temperature
  • A method for preparing flaky Cu nanocrystals at room temperature

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1: Preparation 1 of sheet-like structure Cu nanocrystals

[0027] With deionized water as solvent and copper sulfate as solute, configure a solution with a volume of 36 ml and a concentration of 38 mmol / L, and stir until uniform; add 3.6 g of anhydrous sodium carbonate, and after stirring uniformly, add 2.232 g of citric acid Sodium, stirred at room temperature for 5 minutes, then added 6.0 g of potassium bromide powder to the solution, stirred at room temperature for 5 minutes, injected a reducing agent ascorbic acid with a volume of 20 ml and a concentration of 1.5 mol / L, and stirred rapidly at room temperature for 30 minutes. The obtained product is separated by a centrifuge, dispersed in deionized water for ultrasonication, secondly centrifuged, dispersed in ethanol, and placed in a blast drying oven at 50 degrees after being centrifuged again for drying.

[0028] We first performed an X-ray diffraction test on the sample. from figure 1 It can be seen t...

Embodiment 2

[0030] Embodiment 2: The effect verification of potassium bromide.

[0031] In order to verify the effect of potassium bromide in the whole preparation, we implemented the following experiment: the operation in Example 1 "adding 6.0 grams of potassium bromide powder to the solution and stirring at room temperature for 5 minutes" was removed, and other conditions were unchanged. pass Figure 5 From the results of field emission scanning electron microscopy, it can be seen that Cu cannot form a sheet-like two-dimensional structure due to the participation of no additive potassium bromide. From this example, it can be concluded that bromide ions in potassium bromide can control the growth orientation of Cu nanocrystal seeds through directional adsorption.

Embodiment 3

[0032] Embodiment 3: Preparation 2 of sheet-like structure Cu nanocrystals

[0033] Change Example 1, preparation operation "20 milliliters, reducing agent ascorbic acid with a concentration of 0.68 mol / liter, stir rapidly at room temperature for 30 minutes" to "20 milliliters, reducing agent ascorbic acid with a concentration of 0.68 moles / liter, rapidly stir at room temperature for 90 minutes ". The obtained samples were scanned by scanning electron microscope as Image 6 shown. The results show that the method of this example can also obtain sheet-like Cu nanocrystals. From this example, it can be concluded that prolonging the reaction time will not affect the structure of the product obtained.

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Abstract

The invention relates to a method for preparing Cu nanocrystals with sheet-like structure, and belongs to the technical field of synthesis methods of metal nanomaterials. The present invention adopts a liquid-phase chemical reduction method, and the preparation process includes: configuring a volume to provide a Cu source for the precursor copper sulfate solution, adding sodium carbonate powder to increase the pH value of the solution, adding complexing agent sodium citrate, and adding an additive potassium bromide for directional adsorption control For nanocrystal growth, add ascorbic acid and stir at room temperature. The invention has simple operation, realizes the preparation of sheet-like Cu nanocrystals at room temperature, and is beneficial to low-cost preparation; the additive used is water-soluble and can be removed by a simple method, and is beneficial to maintaining the activity of Cu nanocrystals.

Description

technical field [0001] The invention belongs to the technical field of nanocrystal preparation, in particular to a simple method for preparing flaky Cu nanocrystals by means of liquid phase reduction. Background technique [0002] In recent years, Cu nanocrystals have received extensive attention due to their applications in the electronics industry and catalysis. At present, the methods that can effectively prepare Cu nanocrystals include: physical vapor deposition, chemical vapor deposition, liquid phase reduction method, thermal solvent method, thermal decomposition method, microwave synthesis method and so on. Among many synthetic methods, the liquid-phase reduction method is the most effective and feasible method, which is due to its low requirements on synthetic equipment and simple operation. However, Cu elemental nanocrystals synthesized by the liquid phase method are limited to nanoparticles or one-dimensional nanomaterials, and nanocrystals with a two-dimensional ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24B22F1/00B82Y40/00
CPCB82Y40/00B22F9/24B22F1/0551B22F1/054
Inventor 刘欣美杨文龙马艳斌张秋佳
Owner HARBIN UNIV OF SCI & TECH
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