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A kind of preparation method of nano silver polyhedron quasi-sphere

A polyhedral, nano-silver technology, applied in the field of precious metal silver nanomaterials, can solve the problems of inability to control the shape and size of nano-silver particles, the mixed shape of the final product of nano-silver particles, and hindering commercial applications, and achieve localized surface plasmon. The resonance absorption spectrum has strong controllability, good monodispersity, and the effect of a wide range of particle size control

Active Publication Date: 2019-03-15
GUILIN UNIV OF ELECTRONIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the seed crystal nucleation stage, the silver seed crystal is in the fluctuating stage. At this time, the silver seed crystal is composed of a mixture of single crystal crystal, twin crystal crystal and polycrystalline crystal (the single crystal crystal and twin crystal crystal are surrounded by {100} crystal planes. The polycrystalline crystal is surrounded by {111} crystal planes), so the top-down method reported so far is to reduce silver ions in the solution to prepare nano-silver particles, and the final product has mixed shape, uneven size, even agglomeration and sintering. , irregular shape, unable to control the shape and size of nano-silver particles, which seriously hinders its commercial application

Method used

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  • A kind of preparation method of nano silver polyhedron quasi-sphere
  • A kind of preparation method of nano silver polyhedron quasi-sphere
  • A kind of preparation method of nano silver polyhedron quasi-sphere

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Embodiment 1: prepare 48.7nm nano-silver polyhedron quasi-sphere

[0027] Before using the ethylene glycol reagent, dry it continuously at 105-110°C for more than 1 hour to remove water, and add 0.03M AgNO 3 , 5mM Ni(NO 3 ) 2 ·6H 2 O and 0.14M, Mw=30000 polyvinylpyrrolidone were added to 100mL of ethylene glycol solvent in order to remove water, sealed with plastic wrap and stirred vigorously for 0.5-1h, then slowly stirred for 5-10min to fully dissolve. Remove the plastic wrap, open the container, and irradiate the above solution with a microwave oven with a frequency of 2450MHz at a power of 300-1000W at 140-165°C for 3 minutes, stop for 2-3 minutes and then irradiate with microwaves for 1 minute. After the reaction is completed, place it at room temperature and cool it to room temperature , add deionized water to dilute 2-5 times, stir for 10-20min, centrifuge at 3000-8000rpm after ultrasonication for 5-10min, remove the supernatant, and wash the bottom colloid th...

Embodiment 2

[0028] Embodiment 2: prepare 65.8nm nano-silver polyhedron quasi-sphere

[0029] Referring to Example 1, the difference is that: polyvinylpyrrolidone is reduced to 0.09M, and the microwave irradiation time is 4min, and product B can be produced, and the quasi-sphere diameter of the nano-silver polyhedron is 65.8 ± 3.7nm, and its scanning electron microscope (SEM) figure, see figure 1 In B, the product has regular shape and uniform size, and the shape and size can be adjusted. X-ray diffraction (XRD) pattern see Figure 4 , UV-visible-near-infrared light absorption spectrum see Figure 5 In B, the transmission electron microscope-energy spectrum (TEM-EDS) of product of the present invention sees Image 6 .

Embodiment 3

[0032] Embodiment 3: prepare 75.8nm nano-silver polyhedron quasi-sphere

[0033] With reference to Example 1, the difference is that: the microwave irradiation time is 4-5min, product C can be obtained, and the quasi-sphere diameter of the nano-silver polyhedron is 75.8 ± 4.2nm, and its scanning electron microscope (SEM) figure is shown in figure 1 Middle C, X-ray diffraction (XRD) pattern see Figure 4 , UV-visible-near-infrared light absorption spectrum see Figure 5 In C, the transmission electron microscope-energy spectrum (TEM-EDS) of product of the present invention sees Image 6 .

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Abstract

The invention discloses a preparation method of nanometer silver polyhedral quasi-spheres. In the method, silver nitrate is used as a precursor, polyalcohol is used as a solvent and a reducing agent, polyvinylpyrrolidone is used as a capping agent and a stabilizer, and microwave irradiation is used as a heat source. Using the inducer nickel nitrate in the seed crystal nucleation stage to make the crystal uniform epitaxial growth to achieve shape and size control, green environmental protection, simple process, short production cycle, low cost, high product concentration and purity, high yield, easy to mass production, The obtained nano-silver polyhedral quasi-sphere has a single shape, uniform particle size distribution, and a wide range of particle size regulation, which can be regulated in the range of 48.7-411.9nm. The nano-silver polyhedron quasi-sphere is mainly surrounded by {111} crystal planes. Physical and It has stable chemical properties, good monodispersity, strong controllability of localized surface plasmon resonance absorption spectrum, excellent optical and electrical properties, and is widely used.

Description

Technical field: [0001] The invention relates to the technical field of precious metal silver nanomaterials, in particular to a preparation method of nano silver polyhedron quasi-spheres. Background technique: [0002] Bulk silver is the noble metal with the best conductivity and excellent thermal conductivity. The size of nano-silver particles is in the range of 1-100nm. Particles have attracted much attention due to their unique properties different from those of bulk silver in chemistry, optics, electricity, magnetism, mechanics, heat, and acoustics. For example, silver is a broad-spectrum antibacterial agent. Due to its extremely small particle size and large specific surface area, silver nanoparticles have stronger tissue permeability and surface activity, and their bactericidal effect is much higher than that of ordinary silver. The absorption spectrum of localized surface plasmon resonance (LSPR) depends on its shape and size. Usually, as the size increases, the LSPR...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B29/60C30B29/02C30B28/04B22F9/24B82Y40/00
CPCB22F9/24B82Y40/00C30B28/04C30B29/02C30B29/60
Inventor 王海龙苗蕾
Owner GUILIN UNIV OF ELECTRONIC TECH
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