A kind of preparation method of nano-gold particles with different particle sizes

Abstract

The invention belongs to the technical field of nano-metal materials, and discloses a preparation method of nano-gold particles with different particle sizes; 50 mL of 0.25 mM chloroauric acid solution is added to a round-bottomed flask, heated to boiling with magnetic stirring; potassium tartrate sodium is added Solution, reacted under reflux for 30min to obtain wine red colloidal gold sol, cooled naturally to room temperature for later use; diluted the seed growth solution to 20mL, heated to 80°C; solution; the dropwise addition is completed and the mixed solution is heated to boiling, kept boiling for more than 30 minutes, and cooled to obtain nano-gold sol; change the amount of seed growth solution or repeat the above drop-adding steps to prepare nano-gold particles with different particle sizes. The invention is simple and quick, easy to operate, easy to control the parameters of the preparation process, and can prepare nano-gold particles with uniform particle size and controllable particle size parameters.

Description

technical field [0001] The invention belongs to the technical field of nano metal materials, in particular to a method for preparing nano gold particles with different particle sizes. Background technique [0002] At present, the existing technologies commonly used in the industry are as follows: [0003] Nanomaterials have unique small size effect, quantum effect and surface interface effect, so that nanomaterials can be widely used in various fields such as medical detection, chemical sensing, environmental protection, textile and machinery industry. Gold nanoparticles have unique biocompatibility, high electron density and dielectric properties, excellent optical and catalytic properties, and have been used in microscopic labeling, chemical biosensing and biochips, food safety detection and analysis, surface catalysis and environmental protection. Conservation methods have achieved rich research results. Therefore, it is very important to study the simple, fast and safe...

AI Technical Summary

Problems solved by technology

[0007] Many existing technologies use a reducing agent to prepare nano-gold particles in a one-time reduction method. The process parameters of this preparation method are difficult to control, and the prepared nano-gold particles often have uneven particle sizes.

Especially for the preparation of large-diameter gold nanoparticles, there are often problems that the shape and size are difficult to control

However, other physical methods such as impact, extrusion, collision, shearing or friction are used to prepare gold nanoparticles, and there are disadvantages such as complex methods, inconvenient operation and high cost.

Moreover, the particle size parameters of the prepared nanoparticles cannot be adjusted and the size is not uniform, which limits the application of gold nanoparticles in medical testing, chemical sensing, environmental monitoring and other fields.

It is also not conducive to the study of the particle size effect of gold nanoparticles on cell viability, surface-enhanced Raman scattering and fluorescent labeling, etc.

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