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Crystal seed growth method for preparing gold nano-particles

A seed growth method, a technology of gold nanoparticles, applied in nanotechnology and other directions, can solve the problems of uneven morphology, toxicity, poor monodispersity of gold nanoparticles, etc.

Inactive Publication Date: 2015-04-29
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention aims to solve the technical problems that the raw materials for preparing large-diameter gold nanoparticles by the current seed crystal growth method are toxic, the reducing agent introduces impurities, and the obtained gold nanoparticles have poor monodispersity and inhomogeneous appearance, and provide a method for using Seed growth method for the preparation of gold nanoparticles

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specific Embodiment approach 1

[0015] Embodiment 1: This embodiment is a seed crystal growth method for preparing gold nanoparticles, which is specifically carried out in the following steps:

[0016] 1. Preparation of gold species: HAuCl with a mass fraction of 1% 4 The aqueous solution is added to deionized water, and the temperature is raised from room temperature to 99°C under the condition of a rotating speed of 250rpm. 600rpm ~ 1200rpm and a temperature of 99 ° C under the conditions of reaction for 15min ~ 20min, stop stirring and heating, and naturally cool to room temperature to obtain a small particle size spherical gold nanoparticle solution; the mass fraction is 1% HAuCl 4 The volume ratio of aqueous solution to deionized water is 1:(90~100); the mass fraction is 1% HAuCl 4 Aqueous solution and mass fraction are that the volume ratio of the sodium citrate aqueous solution of 1% is 1:(3~5);

[0017] 2. Preparation of gold nanoparticles by seed crystal growth method: HAuCl with a mass fraction o...

specific Embodiment approach 2

[0022] Specific embodiment two: the difference between this embodiment and specific embodiment one is: in step one, the mass fraction is 1% HAuCl 4 The aqueous solution is added to deionized water, and the temperature is raised from room temperature to 99°C under the condition of 250rpm at the rotating speed, and then 1% sodium citrate aqueous solution is added with the mass fraction under the condition of 1000rpm and 99°C at the rotating speed. After reacting for 15 minutes at a temperature of 99° C., stop stirring and heating, and naturally cool to room temperature to obtain a small-diameter spherical gold nanoparticle solution. Others are the same as in Embodiment 1.

specific Embodiment approach 3

[0023] Specific embodiment three: this embodiment is different from one of specific embodiments one to two: the mass fraction described in step one is 1% HAuCl 4 The volume ratio of aqueous solution to deionized water is 1:100. Others are the same as one of the specific embodiments 1 to 2.

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Abstract

The invention discloses a crystal seed growth method for preparing gold nano-particles, relates to a crystal seed growth method for preparing gold nano-particles and aims at solving the technical problems of the traditional crystal seed growth method for preparing large-particle size gold nano-particles that raw materials have toxicity, impurities are introduced into a reducing agent, and the prepared gold nano-particles are poor in monodispersity and inhomogenous in morphology. The crystal seed growth method comprises the following steps: 1, preparing a gold seed; and 2, preparing the gold nano-particles by virtue of the crystal seed growth method. The crystal seed growth method has the advantages that 1, the prepared gold nano-particles are uniform in particle size and morphology and is spherical, the particle size of the gold nano-particles can be accurately controlled by changing a ratio of HAuCl4 and the gold seed, the standard dispersity error of the prepared gold nano-particles is smaller than 10 percent, and the particle aspect ratio is smaller than 1.1; and 2, as rapid reaction is carried out at room temperature, and H2O2 is utilized as a reducing agent, after reaction, the H2O2 can be removed by simple decomposition reaction or boiling, and a new chemical component and impurities are not introduced on the basis of original gold seed.

Description

technical field [0001] The present invention relates to a method for preparing gold nanoparticles. Background technique [0002] Gold nanoparticles have been widely studied due to their unique physical and chemical properties and their applications in catalysis, electronics, biomedicine, and other fields. The optical, electrical, magnetic, and catalytic properties of nanomaterials strongly depend on the size and shape of the particles, so it is of great significance to precisely control the shape and size of gold nanoparticles for their applications. The classic synthesis method of gold nanoparticles is the sodium citrate reduction method proposed by Turkevich in 1951. In this method, sodium citrate is used as a reducing agent, and the Au in the gold salt solution 3+ It is reduced to Au, and is adsorbed on the surface of gold nanoparticles as a stabilizer. By controlling the amount of sodium citrate added, the particle size of gold nanoparticles can be adjusted within the ...

Claims

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Application Information

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IPC IPC(8): B22F9/24B82Y40/00
Inventor 张渤雨徐忠海曹振兴王荣国郝立峰刘文博矫维成杨帆赫晓东
Owner HARBIN INST OF TECH
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