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Nano silver particles and preparation method and application thereof

A technology of nano-silver particles and silver nitrate, which is applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of poor dispersion of nano-silver particles, complicated process, and large particle size. Simplified species and post-treatment process, high purity, and not easy to reunite

Inactive Publication Date: 2019-08-30
SHENZHEN INST OF ADVANCED TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The invention provides a nano-silver particle with a particle size of 30-50nm and a preparation method thereof, to solve the problem of unstable yield, complex process, high cost, and difficulty in industrialized scale-up production of the existing nano-silver particle preparation method , and the problems such as poor dispersion of the prepared silver nanoparticles, or large particle size, or low uniformity, or low purity; meanwhile, the present invention also provides the application of the silver nanoparticles

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  • Nano silver particles and preparation method and application thereof
  • Nano silver particles and preparation method and application thereof
  • Nano silver particles and preparation method and application thereof

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preparation example Construction

[0030] In view of the difficulty in the current low-cost and large-scale preparation process of nano-silver particles, the present invention provides a method for preparing nano-silver particles. This method is also based on the liquid-phase chemical reduction method. The preparation process is obtained, specifically including the following steps:

[0031] Step S1, first prepare silver ammonia solution and polyvinylpyrrolidone dispersion at room temperature; wherein, silver ammonia solution is prepared by first dispersing silver nitrate in water, and then adding ammonia water to it; polyvinylpyrrolidone dispersion is prepared by It is prepared by dispersing polyvinylpyrrolidone in polyethylene glycol.

[0032] In the preparation of silver ammonia solution, silver nitrate is used as the raw material for the preparation of nano-silver particles. The conversion rate of the prepared nano-silver is high, and impurities such as nano-rods and nano-wires will not be formed, because no...

Embodiment 1

[0043] (1) Disperse 1.5g silver nitrate in 15mL pure water, add ammonia water to prepare silver ammonia solution (at this time, the quality of silver nitrate accounts for about 9.2% of the total mass of silver ammonia solution), disperse 1g PVPK15 in 30mL polyethylene glycol 200 to obtain polyvinylpyrrolidone dispersion;

[0044] (2) Mix the silver ammonia solution obtained in step (1) with the polyvinylpyrrolidone dispersion, react at 130°C for 1h under stirring at 400r / min, centrifuge, wash, and blow dry at 60°C for 8h to obtain 0.87g nano silver Particle powder, yield is 92%, use electron microscope to observe this nano-silver particle powder, the observation result sees figure 1 ; Use the X-ray diffractometer to carry out diffraction to the nano-silver particle powder, and the diffraction results are shown in Figure 7 ,from Figure 7 It can be seen from the results that the silver nanoparticles prepared by the preparation method provided by the present invention have go...

Embodiment 2

[0046] (1) Disperse 2.1g silver nitrate in 25mL pure water, add ammonia water to prepare silver ammonia solution (at this time, the quality of silver nitrate accounts for about 7.7% of the total mass of silver ammonia solution), disperse 1.5g PVPK30 in 60mL polyethylene glycol In alcohol 300, obtain polyvinylpyrrolidone dispersion liquid;

[0047] (2) Mix the silver ammonia solution obtained in step (1) with the polyvinylpyrrolidone dispersion, react at 120°C for 3h under stirring at 500r / min, centrifuge, wash, and vacuum dry at 40°C for 6h, 1.19g nano silver particle powder body, the yield is 90%, and the nano silver particle powder is observed with an electron microscope, and the observation results are shown in figure 2 .

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Abstract

The invention relates to the technical field of nano materials, and provides a preparation method of the nano silver particles. The method comprises the steps that S1, a silver ammonia solution and polyvinylpyrrolidone dispersion liquid are prepared, wherein the polyvinylpyrrolidone dispersion liquid is prepared in the manner that polyvinylpyrrolidone is dispersed in polyethylene glycol; and S2, the silver ammonia solution and the polyvinylpyrrolidone dispersion liquid are mixed, and stirring is carried out at the temperature ranging from 100 DEG C to 150 DEG C at the rotating speed being 400r / min to 900 r / min for 0.1 h to 6 h. Raw materials used in the preparation method are environment-friendly, the reaction conditions are mild, the equipment requirements are low, the yield is high, andindustrialization promotion is facilitated; and the nano silver particles prepared by the preparation method are small in particle size and high in uniformity, are not prone to agglomerating and arehigh purify. The further provided nano silver particles are of cubic crystal structures, the particle size is from 30 nm to 50 nm and is uniform in distribution, and the nano silver particles can be applied to the fields of electronic packaging and antibacterial fabrics.

Description

technical field [0001] The invention relates to the technical field of nanomaterials, and more specifically, to a nano silver particle and a preparation method and application thereof. Background technique [0002] Silver nanomaterials are a kind of nanomaterials. Among all kinds of metal nanomaterials, silver nanomaterials have attracted people's attention since their appearance, not only because of their unique electronic, optical, mechanical and catalytic properties, but also have good antibacterial properties, biocompatibility Advantages such as high performance and easy surface modification. Silver nanomaterials have recently been widely used in the field of electronic packaging, such as the most critical silver conductive filler in conductive ink, making silver paste as a high-temperature resistant chip connection material, etc. [0003] The preparation methods of nano-silver powder include gas-phase method, solid-phase method and liquid-phase reduction method. Among...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B22F1/00B82Y40/00B82Y30/00
CPCB22F9/24B82Y40/00B82Y30/00B22F1/054
Inventor 赵涛郝放朱朋莉胡友根梁先文孙蓉
Owner SHENZHEN INST OF ADVANCED TECH
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