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Method for preparing monodisperse flower-shaped gold/platinum hybrid nano particles having different particle diameters

A technology of hybrid nanoparticles and gold nanoparticles, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, etc.

Inactive Publication Date: 2009-04-15
CHANGZHOU INST OF ENERGY STORAGE MATERIALS &DEVICES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, finding a simple, green chemical process to prepare gold / platinum hybrid nanoparticles remains a great challenge

Method used

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  • Method for preparing monodisperse flower-shaped gold/platinum hybrid nano particles having different particle diameters
  • Method for preparing monodisperse flower-shaped gold/platinum hybrid nano particles having different particle diameters
  • Method for preparing monodisperse flower-shaped gold/platinum hybrid nano particles having different particle diameters

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] a. Preparation of 25 nm gold nanoparticles

[0013] Put 0.5-2 ml of 24.3mM / LHAuCl 4 The aqueous solution was added to 50-200 ml of distilled water and heated to boiling, and then 0.75-3 ml of 34.3 mM / L sodium citrate aqueous solution was quickly added to obtain 25 nm gold nanoparticles after heating for 10 minutes;

[0014] b, with the gold nanoparticles obtained above as seeds, with 0.1M / L ascorbic acid as green reducing agent, with 19.3mM / L H 2 PtCl 6 As a platinum source, the molar ratio of platinum to gold is 2:1, 0.1M / L ascorbic acid and 19.3mM / L H 2 PtCl 6 The volume ratio is 0.8-2, and heated at 100° C. for 15 minutes to obtain monodisperse flower-shaped gold / platinum hybrid nanoparticles with a particle size of 35 nm.

Embodiment 2

[0016] a. Preparation of 13nm gold nanoparticles

[0017] In 2.12 mL of 24.3mM / LHAuCl 4 The aqueous solution was added to 50 ml of distilled water and heated to boiling, then 5.7 ml of 34.3 mM / L sodium citrate aqueous solution was added rapidly. After heating for 10 minutes, gold nanoparticles of 13 nm were obtained;

[0018] b, with the gold nanoparticles obtained above as seeds, with 0.1M / L ascorbic acid as green reducing agent, with 19.3mM / L H 2 PtCl 6 As a platinum source, the molar ratio of platinum to gold is 2:1, 0.1M / L ascorbic acid and 19.3mM / L H 2 PtCl 6 The volume ratio is 0.8-2, and heated at 100° C. for 15 minutes to obtain monodisperse flower-shaped gold / platinum hybrid nanoparticles with a particle size of about 20 nanometers.

Embodiment 3

[0020] a. Preparation of 3 nm gold nanoparticles

[0021] In 0.5-2ml 24.3mM / L HAuCl 4 Add the aqueous solution to 50-200 ml of distilled water, then add 0.75-3 ml of 34.3 mM / L sodium citrate aqueous solution, add 0.5-3 ml of 0.1 M / L sodium borohydride aqueous solution under stirring conditions, and stir overnight to obtain about 3 nm of gold nanoparticles;

[0022] b, with the gold nanoparticles obtained above as seeds, with 0.1M / L ascorbic acid as green reducing agent, with 19.3mM / L H 2 PtCl 6 As a platinum source, the molar ratio of platinum to gold is 2:1, 0.1M / L ascorbic acid and 19.3mM / L H 2 PtCl 6 The volume ratio is 0.8-2, and heated at 100° C. for 15 minutes to obtain monodisperse flower-shaped gold / platinum hybrid nanoparticles with a particle size of about 6 nanometers.

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Abstract

The invention provides a method for preparing monodisperse flower-like gold / platinum hybrid nano-particles with different particle sizes. The method adopts a green chemical method to prepare the monodisperse flower-like gold / platinum hybrid nano-particles with the assistance of sodium citrate. The method is characterized in that gold nano-particles protected by the sodium citrate are taken as seeds, and flower-like platinum shells are further grown on the surfaces of the gold nano-particles so as to prepare the monodisperse flower-like gold / platinum hybrid nano-particles. The method has the advantages of simplicity and convenience, and provides an achievable way for synthesizing the monodisperse flower-like gold / platinum hybrid nano-particles with high quality and different particle sizes. The obtained monodisperse flower-like gold / platinum hybrid nano-particles with different particle sizes of between 6 and 35 nanometers can achieve important application in the fields of fuel cells, nanometer electrochemistry and the like.

Description

technical field [0001] The invention relates to a preparation method of monodisperse flower-shaped gold / platinum hybrid nanoparticles with different particle sizes. Background technique [0002] Platinum nanomaterials have been extensively studied due to their unique physical and chemical properties and their wide applications in chemical sensors, biosensors, and fuel cells. Many experimental evidences have demonstrated that the catalytic efficiency and selectivity of platinum nanomaterials are highly dependent on their shape, composition, and size. Therefore, it is of great significance to synthesize platinum nanostructure materials with specific morphology. Currently, several approaches have been employed to synthesize platinum nanomaterials with specific morphologies and catalytic properties. For example, Sun et al. reported a simple high-temperature organic phase route to synthesize monodisperse platinum cubes (J. Am. Chem. Soc. 2007, 129, 6974). Wang et al reported a...

Claims

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Application Information

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IPC IPC(8): B01J23/38B01J35/02
Inventor 董绍俊郭少军
Owner CHANGZHOU INST OF ENERGY STORAGE MATERIALS &DEVICES
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