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Method for preparing multi-metal nanoparticles by one-step coreduction

A multi-metal and nanoparticle technology, applied in nanotechnology and other directions, can solve problems such as inability to large-scale production, harsh and complex experimental conditions, application limitations, etc., to achieve good experimental repeatability, simple and fast experimental operation.

Inactive Publication Date: 2012-07-18
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of this method is that in the preparation process, a metal nanoparticle needs to be synthesized first, and then the metal nanoparticle is separated and purified, and then the second metal ion is further reduced with it as a seed to form a metal shell.
The synthetic method undergoes multi-step reactions, the experimental conditions are harsh and complex, and large-scale production is not possible, so its application is greatly limited

Method used

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  • Method for preparing multi-metal nanoparticles by one-step coreduction
  • Method for preparing multi-metal nanoparticles by one-step coreduction
  • Method for preparing multi-metal nanoparticles by one-step coreduction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 0.0648mL concentration of 0.04g / mL of HAuCl 4 solution and 0.0625 mL of H at a concentration of 0.04 g / mL 2 PdCl 6 The solution was dissolved in 50mL deionized water, and the total concentration of metal ions was 2.5×10 -4 mol / L, HAuCl 4 with H 2 PdCl 6 The molar ratio between them is 1:1, the reaction system is stirred and heated to 100° C. to boil the solution to obtain a tan transparent solution. Then, 1 mL of 2 wt % sodium citrate solution was added to the reaction system. After keeping the solution boiling for 10 minutes, stop heating and continue stirring to cool to room temperature, such as figure 1 As shown, the spherical-like Au / Pd binary metal nanoparticles with an average particle diameter of 34.4nm were obtained.

Embodiment 2

[0022] 0.0648mL concentration of 0.04g / mL of HAuCl 4 solution and 0.0625 mL of H at a concentration of 0.04 g / mL 2 PdCl 6 The solution was dissolved in 50mL deionized water, and the total concentration of metal ions was 2.5×10 -4 mol / L, HAuCl 4 with H 2 PdCl 6 The molar ratio between them is 1:1, the reaction system is stirred and heated to 100° C. to boil the solution to obtain a tan transparent solution. Then, 3 mL of sodium citrate solution with a concentration of 2 wt % was added to the reaction system. After keeping the solution boiling for 10 minutes, stop heating and continue stirring to cool to room temperature, such as figure 2 As shown, flower-shaped Au / Pd binary metal nanoparticles with an average particle diameter of 28.6 nm were obtained.

Embodiment 3

[0024] 0.0648mL concentration of 0.04g / mL of HAuCl 4 solution and 0.0625 mL of H at a concentration of 0.04 g / mL 2 PdCl 6 The solution was dissolved in 50mL deionized water, and the total concentration of metal ions was 2.5×10 -4 mol / L, HAuCl 4 with H 2 PdCl 6 The molar ratio between them is 1:1, the reaction system is stirred and heated to 100° C. to boil the solution to obtain a tan transparent solution. Then, 4 mL of 2 wt % sodium citrate solution was added to the reaction system. After keeping the solution boiling for 10 minutes, stop heating and stir to cool to room temperature, such as image 3 As shown, dendritic Au / Pd binary metal nanoparticles were obtained.

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Abstract

The invention belongs to the technical field of preparation of metal nanoparticles, and relates to a method for preparing multi-metal nanoparticles by one-step coreduction through citrate, particularly to the method for preparing the multi-metal nanoparticles with different sizes and morphologies by heating and boiling a mixed solution of a variety of metal ions and adding a citrate solution into the mixed solution rapidly, or heating and boiling the citrate solution and adding the mixed solution of a variety of metal ions into the citrate solution rapidly. The method can be used for preparing the multi-metal nanoparticles with high-efficiency catalytic activity easily and rapidly on a large scale. The gold source is HAuCl4.4H2O or HAuBr4.H2O, the palladium source is K2PdCl6 or K2PdCl4, the silver source is AgNO3 or AgF, the platinum source is K2PtCl6 or H2PtCl6.6H2O, and the citrate is sodium citrate, potassium citrate or ammonium citrate.

Description

technical field [0001] The invention belongs to the technical field of metal nanoparticle preparation, and in particular relates to a method for preparing multi-element metal nanoparticle by one-step co-reduction of citrate, in particular to a method of heating and boiling a mixed solution of various metal ions to rapidly add citrate solution, or the citrate solution is heated and boiled, and a mixed solution of metal ions is quickly added thereto to prepare multi-component metal nanoparticles. Background technique [0002] Multi-element metal nanoparticles with high catalytic activity can be widely used as new catalysts in many chemical reactions, such as suzuki coupling reaction, acetylene hydrogenation reaction, vinyl acetate synthesis, hydrogen peroxide synthesis, carbon monoxide oxidation, etc. focus of researchers' attention. With the increasing demand for multi-component metal nanoparticle catalysts, more and more synthetic methods have been developed. At present, t...

Claims

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Application Information

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IPC IPC(8): B22F9/24B82Y40/00
Inventor 张皓韩吉姝周紫薇杨柏
Owner JILIN UNIV
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