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Spheroidal gold particle and step-by-step rapid synthesis method thereof

A kind of technology of gold particles and spherical shape, which is applied in the direction of nanotechnology, nanotechnology for materials and surface science, nanotechnology, etc., can solve the problems of slow reaction, insufficient sphericity, and low sphericity of gold particles, and achieve spherical shape The effect of good precision, fast response and narrow size

Active Publication Date: 2015-01-28
THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The shortcoming of the first method is that the synthesized gold particles are obviously irregular polyhedrons, and the sphericity is not good enough; the shortcoming of the second method is that the reaction is too slow (sampling rate 2mL / h), and it is not suitable for heavy volume Rapid production, and the synthesis methods of the two are not compatible
However, due to the low sphericity of the gold particles in the prior art, and the slow synthesis method, its large-scale use is limited.

Method used

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  • Spheroidal gold particle and step-by-step rapid synthesis method thereof
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  • Spheroidal gold particle and step-by-step rapid synthesis method thereof

Examples

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Effect test

Embodiment 1

[0056] Example 1: Synthesis of 20nm polycrystalline gold particles

[0057] Add cetyltrimethylammonium chloride, cetyltrimethylammonium bromide, chloroauric acid and ascorbic acid to the secondary water successively, wherein cetyltrimethylammonium chloride / hexadecane The ratio of trimethylammonium bromide is 0, the total concentration is 1 mM, the concentration of metal chloride is 0.25 mM, and the concentration of ascorbic acid is 4 mM. Under the conditions of 9 rev / s and a temperature of 40° C., 10 nm polycrystalline gold particles synthesized by the sodium citrate method were quickly added with a seed concentration of 0.48 nM. Easy to react for 15 minutes, polycrystalline gold particles with a diameter of 20.5±0.9nm (see figure 1 (a)).

Embodiment 2

[0058] Example 2: Synthesis of 32nm polycrystalline gold particles

[0059] Add cetyltrimethylammonium chloride, cetyltrimethylammonium bromide, chloroauric acid and ascorbic acid respectively by embodiment 1, different is cetyltrimethylammonium chloride / cetyltrimethylammonium The ratio of alkyltrimethylammonium bromide is 10, and the total concentration is 10mM. The 20nm polycrystalline gold particles synthesized in Example 1 are used as seeds, and the seed concentration is 0.08nM to obtain polycrystalline gold particles with a diameter of about 32nm (see figure 1 (b)).

Embodiment 3

[0060] Example 3: Synthesis of polycrystalline gold particles of 50 nm

[0061] Add cetyltrimethylammonium chloride, cetyltrimethylammonium bromide, chloroauric acid and ascorbic acid respectively according to Example 2, the difference is that the 32nm polycrystalline gold particles synthesized in Example 2 are used as seeds , with a seed concentration of 0.013nM, polycrystalline gold particles with a diameter of about 50nm were obtained (see figure 1 (c)).

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Abstract

The invention relates to a spheroidal gold particle and a step-by-step rapid synthesis method thereof. The method includes the following steps: soluble gold salt, surfactant and reducer are prepared into mixed solution, and gold particle seeds are added in the process of rapid agitation, and thereby react to grow into spheroidal gold particles, the grain size of which is 5nm to 100nm; the surfactant is the mixed surfactant of cetyltrimethylammonium bromide or cetyltrimethylammonium chloride and cetyltrimethylammonium bromide, the reducer is ascorbic acid, and the gold particle seeds are spheroidal gold particles, the grain size of which is 2nm to 60nm. The gold particle seeds can be monocrystalline or polycrystalline, and the synthesized spheroidal gold particles have the same crystal form as the gold particle seeds. Since the invention adopts the surfactant and the reducer and the gold particle seeds are added in the process of rapid agitation, reaction is rapid enough, consequently, the gold salt can rapidly and uniformly grow on the surfaces of the gold particle seeds, and the obtained spheroidal gold particles is narrow in grain size and has a good degree of sphericity.

Description

technical field [0001] The invention belongs to the technical field of nanoparticle synthesis, and relates to a rapid synthesis method for synthesizing larger spherical gold particles from gold particle seeds. Background technique [0002] Noble metal nanoparticles have potential applications in the fields of electronics, catalysis, optics, and energy. Among them, gold, silver, and copper nanoparticles stand out in plasmonic photonics and surface-enhanced spectroscopy applications due to their strong localized surface plasmon resonance properties. Among them, gold nanoparticles have broad application prospects in fields closely related to biomedicine, such as biosensing, drug delivery, disease diagnosis and treatment, and bioimaging, due to their high chemical stability and good biocompatibility. . [0003] At present, there are mainly two mature methods for synthesizing gold nanoparticles. One is polycrystalline gold particles, using Turkevich and Frens et al. 20–22.) S...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B22F1/00B82Y30/00B82Y40/00
Inventor 纪英露吴晓春
Owner THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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