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Method for synthesizing core-shell structure nanoparticles with nanogold coated with nickel-cobalt composite metal oxide

A nanoparticle and composite metal technology, applied in the direction of nanotechnology, nanotechnology, metal processing equipment, etc., can solve the problems of insufficient detection life, weak adsorption, low sensitivity, etc., and achieve controllable synthesis process and high reproducibility , the effect of high Raman sensitivity

Pending Publication Date: 2022-06-21
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the sensitivity of conventional Raman spectroscopy is too low to detect most of the short-lived and weakly adsorbed reaction intermediate species.

Method used

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  • Method for synthesizing core-shell structure nanoparticles with nanogold coated with nickel-cobalt composite metal oxide
  • Method for synthesizing core-shell structure nanoparticles with nanogold coated with nickel-cobalt composite metal oxide
  • Method for synthesizing core-shell structure nanoparticles with nanogold coated with nickel-cobalt composite metal oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A "core-shell structure" nanoparticle of nickel-cobalt composite metal oxide coating nano-gold, gold as the core, nickel-cobalt composite metal oxide as the shell, the particle size of the gold particle is 55nm, and the thickness of the shell layer is 1-2nm; The molar ratio to nickel-cobalt composite metal oxide is 1.4-1.8:1, and the molar ratio of nickel metal oxide to cobalt metal oxide in the nickel-cobalt composite metal oxide is 1-3.3:2-6.7. The specific preparation steps are as follows:

[0035](1) Using the "sodium citrate method" to synthesize Au nanoparticles with a particle size of about 55 nm, take 2.425 mL of 1% chloroauric acid solution in tetrahydrate and disperse it in 200 mL of ultrapure water, and start heating, stirring and condensation. , when the solution starts to boil, add 1.5 mL of pre-prepared 1% sodium citrate solution to obtain 55 nm Au nanoparticle sol;

[0036] (2) get the above-mentioned Au nanoparticle sol 40mL centrifugation to remove the...

Embodiment 2

[0043] A "core-shell structure" nanoparticle in which nano-gold is coated with nickel-cobalt composite metal oxide, gold is a core, nickel-cobalt composite metal oxide is a shell, the particle size of the gold particle is 55 nm, and the thickness of the shell layer is 3-4 nm; The molar ratio to nickel-cobalt composite metal oxide is 1.4-1.8:1.7, and the molar ratio of nickel metal oxide to cobalt metal oxide in the nickel-cobalt composite metal oxide is 1-3.3:2-6.7. A kind of "core-shell structure" nanoparticle of nickel-cobalt composite metal oxide-coated nano-gold, the preparation method is the same as that of embodiment 1, the difference is that the addition amounts of nickel chloride ethanol solution and cobalt chloride ethanol solution are 1mL and 1mL respectively. 2mL.

Embodiment 3

[0045] A "core-shell structure" nanoparticle in which nano-gold is coated with nickel-cobalt composite metal oxide, gold is a core, nickel-cobalt composite metal oxide is a shell, the particle size of the gold particle is 55 nm, and the thickness of the shell layer is 9-11 nm; The molar ratio to the nickel-cobalt composite metal oxide is 1.4-1.8:3, the molar ratio of nickel metal oxide to cobalt metal oxide in the nickel-cobalt composite metal oxide is 1-3.3:2-6.7, and the specific preparation method is the same as the implementation. Example 1, the difference is that the addition amounts of nickel chloride ethanol solution and cobalt chloride ethanol solution are 2mL and 4mL, respectively.

[0046] The transmission electron microscope images of core-shell structured nanoparticles prepared by adding different amounts of nickel chloride ethanol solutions and cobalt chloride ethanol solutions in Examples 1-3 are as follows: image 3 shown, from image 3 It can be seen that with...

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Abstract

The invention discloses a synthesis method of core-shell structure nanoparticles of nickel-cobalt composite metal oxide coated nanogold. The synthesis method comprises the following steps: (1) synthesizing particle size Au nanoparticles; (2) ultrasonically dispersing Au nanoparticles in absolute ethyl alcohol; and (3) sequentially adding a nickel chloride ethanol solution, a cobalt chloride ethanol solution, hydrazine hydrate and a sodium hydroxide ethanol solution, heating, stirring and reacting, and centrifugally cleaning to obtain the core-shell structure nanoparticles of the nickel-cobalt composite metal oxide coated nanogold. The thickness of the nickel-cobalt composite oxide shell layer can be adjusted by changing the raw material addition amount of the nickel-cobalt salt, and the synthesized core-shell structure nanoparticles overcome the limitation that a reaction intermediate Raman signal cannot be obtained when a traditional catalyst is directly used for Raman detection; by utilizing the Raman enhancement capability of the Au nanoparticles, an intermediate species signal in the reaction process of the surface of the catalyst shell layer can be obtained, and the research and application field of SERS is effectively widened.

Description

technical field [0001] The invention belongs to the technical field of nanoparticle preparation, and in particular relates to a method for synthesizing core-shell structure nanoparticles with nickel-cobalt composite metal oxide-coated nano-gold. Background technique [0002] With the increasing consumption of traditional fossil energy such as coal, oil and natural gas, energy crisis and environmental pollution problems are becoming more and more serious. Finding efficient and clean renewable energy sources (such as solar, wind, hydroelectric, etc.) has become a top priority. However, due to the inherent intermittency, volatility and randomness of these renewable energy sources, it is difficult to connect them to the normal power grid. Hydrogen energy is considered to be a clean secondary energy carrier and a good energy storage medium, playing an increasingly important role. At present, there are many ways of hydrogen production, but they all face many difficulties. For ex...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B82Y30/00B82Y40/00B22F1/054B22F1/17
CPCB22F9/24B82Y40/00B82Y30/00
Inventor 李剑锋许歌阳董金超
Owner XIAMEN UNIV
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