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Method for preparing hollow gold nanospheres through rapid sintering

A technology of rapid sintering and nanospheres, applied in nanotechnology, metal processing equipment, transportation and packaging, etc., can solve the problems of unfavorable hollow nano-gold application, complex operation procedures, and destruction of microsphere structure, and achieve short preparation time and wide Application prospects, the effect of product purity

Active Publication Date: 2022-03-22
LANZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the template method involves the removal of the final template. On the one hand, the operation procedure is complicated, there is a sacrificial agent, and the cost is high; on the other hand, the microsphere structure will also be destroyed to a certain extent.
In addition, there are liquid phase methods, high temperature dissolution methods, spray methods, etc., but these methods usually involve a variety of chemical substances participating in the reaction, which will introduce impurities and cause the product to be impure
Moreover, nanomaterials will agglomerate in the liquid phase, and long-term high-temperature treatment will also cause problems such as particle growth, which are not conducive to the application of hollow gold nanoparticles.

Method used

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  • Method for preparing hollow gold nanospheres through rapid sintering
  • Method for preparing hollow gold nanospheres through rapid sintering
  • Method for preparing hollow gold nanospheres through rapid sintering

Examples

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Effect test

Embodiment 1

[0035] A method for fast sintering to prepare hollow gold nanospheres, the specific process of the method comprises the following steps:

[0036] (1) Prepare gold nanoparticles and load them on a carbon substrate, the specific steps are as follows:

[0037] (a) Add 60 mg of Ketjen Black to 30 mL of diethylene glycol, and stir to dissolve;

[0038] (b) Add 43.8 mg of gold bromide to the solution of (a), stir for 30 minutes to dissolve, then add 0.5 mL of lithium superhydride;

[0039] (c) centrifuge the solution of (b) at 8000 rpm, take the precipitate, wash the precipitate three times with n-hexane and acetonitrile solution respectively, and finally dry it in an oven.

[0040] (2) Carrying out rapid high-temperature treatment to the carbon-loaded gold nanoparticles obtained in step (1), the specific steps are as follows:

[0041] (a) placing carbon-supported gold nanoparticles on the surface of carbon cloth;

[0042] (b) Connect both ends of the carbon cloth to a DC power s...

Embodiment 2

[0045] A method for fast sintering to prepare hollow gold nanospheres, the specific process of the method comprises the following steps:

[0046] (1) Prepare gold nanoparticles and load them on a silica substrate, the specific steps are as follows:

[0047] (a) Add 60 mg of SBA-15 silicon oxide to 30 mL of diethylene glycol, stir to dissolve;

[0048] (b) Add 43.8 mg of gold bromide to the solution of (a), stir for 30 minutes to dissolve, then add 0.5 mL of lithium superhydride;

[0049] (c) centrifuge the solution of (b) at 8000 rpm, take the precipitate, wash the precipitate three times with n-hexane and acetonitrile solution respectively, and finally dry it in an oven.

[0050] (2) Carrying out rapid high-temperature treatment to the carbon-loaded gold nanoparticles obtained in step (1), the specific steps are as follows:

[0051] (a) placing carbon-supported gold nanoparticles on the surface of carbon cloth;

[0052] (b) Connect both ends of the carbon cloth to a DC pow...

Embodiment 3

[0055] A method for fast sintering to prepare hollow gold nanospheres, the specific process of the method comprises the following steps:

[0056] (1) Prepare gold nanoparticles and load them on a carbon substrate, the specific steps are as follows:

[0057] (a) Add 60 mg of Ketjen Black to 30 mL of diethylene glycol, and stir to dissolve;

[0058] (b) Add 43.8 mg of gold bromide to the solution of (a), stir for 30 minutes to dissolve, then add 0.5 mL of lithium superhydride;

[0059] (c) centrifuge the solution of (b) at 8000 rpm, take the precipitate, wash the precipitate three times with n-hexane and acetonitrile solution respectively, and finally dry it in an oven.

[0060] (2) Carrying out rapid high-temperature treatment to the carbon-loaded gold nanoparticles obtained in step (1), the specific steps are as follows:

[0061] (a) placing carbon-supported gold nanoparticles on the surface of carbon cloth;

[0062] (b) Connect both ends of the carbon cloth to a DC power s...

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Abstract

The invention discloses a method for preparing hollow gold nanospheres through rapid sintering. The method specifically comprises the following steps: firstly, preparing gold nanoparticles, and loading the gold nanoparticles on the surface of a substrate; then directly connecting the gold nanoparticles loaded on the substrate to a power supply or placing the gold nanoparticles on the surface of a heating medium connected to the power supply, introducing an instantaneous large current of 50-200A to the two ends of the sample or the heating medium to quickly heat the sample or the heating medium to 1400-2500K, and keeping heating for 5-60 seconds, so that gold atoms are diffused to the outer surface to form a hollow structure; the hollow gold nanospheres are prepared through the instantaneous large-current rapid heating sintering method, the method is rapid, simple and low in cost, and the prepared hollow gold nanospheres are stable in structure and high in specific surface area and have wide application prospects in the fields of biomedicine, optics, energy catalysis and the like.

Description

technical field [0001] The invention belongs to the field of material preparation, and in particular relates to a method for forming gold nanoparticles into a hollow structure through rapid sintering. Background technique [0002] Gold nanoparticles have unique surface structure, optical properties, stability and biocompatibility, so they are widely used in the fields of biomedicine, optics, and energy catalysis. Gold nanoparticles with a hollow structure can realize the modulation of its characteristic absorption wavelength from the visible region to the near-infrared region, which is helpful for the photothermal therapy of organisms. At the same time, the unique cavity of hollow gold nanospheres has also been proved to have unique plasmonic and optical properties, which can absorb spectral red shifts and form photothermal conversion reagents. Moreover, compared with solid gold particles, hollow gold has a higher specific surface area and lower noble metal content, so it i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B22F1/054B22F1/142B82Y40/00
CPCB22F9/24B82Y40/00Y02P10/25
Inventor 徐英郑权李涛张林
Owner LANZHOU UNIVERSITY