A kind of preparation method of two-dimensional fractal silver nanoparticles in alcohol-water system

A silver nanoparticle and fractal technology, applied in the direction of nanotechnology, can solve the problems of unable to realize the regulation of product morphology, difficult to meet the actual application requirements, harsh operating conditions, etc., to achieve convenient follow-up application, good biocompatibility, Effects that are easy to retouch

Inactive Publication Date: 2016-06-08
JILIN UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

Utilization by H.G.Park et al. (NaPO 3 ) 6 As a stabilizer and template agent, HAuCl was reduced by polyvinylamine at 70°C 4 , to obtain two-dimensional fractal gold nanoparticles (H.Parab, C.JungM.-A.Woo, H.G.Park, JNanopartRes (2011) 13:2173–2180), however, macromolecules need to be added in the reaction, and it is difficult to its removal, severely limiting its range of application
Zheng et al. used water-air interface synthesis to suppress three-dimensional growth and obtained two-dimensional fractal gold nanoparticles (XiangtaoBaiandLiqiangZheng, CrystalGrowth&Design, (2010).10, 4701–4705). This method has harsh operating conditions and low yield , and it is impossible to control the morphology of the product, which is difficult to meet the needs of practical applications.

Method used

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  • A kind of preparation method of two-dimensional fractal silver nanoparticles in alcohol-water system
  • A kind of preparation method of two-dimensional fractal silver nanoparticles in alcohol-water system
  • A kind of preparation method of two-dimensional fractal silver nanoparticles in alcohol-water system

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Embodiment 1

[0021] Pour 94.9 mL of water into a 250 mL flat bottom flask, then add 3.4 mL of 0.17 M sodium citrate, 0.6 mL of 0.17 M citric acid and 1 mL of 0.1 M silver nitrate solution. Add 100 μL of 1 mM NaBH under stirring at 400 r / min 4 Aqueous solution, after continuing to stir for 5 minutes, the solution was heated to boiling rapidly, stopped heating, and stopped stirring, and cooled naturally in the air to obtain a spherical silver nanoparticle solution modified by sodium citrate. As a seed solution, the size of the silver nanoparticle was about 23nm, concentration according to the contained Ag 0 It was calculated as 1 mM and stored at 4°C.

Embodiment 2

[0023] Mix 2.5 mL of absolute ethanol with 2.41 mL of deionized water, and add 50 μL of the seeds prepared in Example 1 and 10 μL of AgNO with a concentration of 0.1 M under stirring conditions of 400 r / min 3 , 10 μL of 0.1M Na 3 Cit, after mixing well, finally add 20 μL of 0.1M NH 2 NH 2 solution. The volume percentage of ethanol in the final solution is 50%, AgNO 3 The concentration is 0.2mM; AgNO 3 and Ag contained in spherical particles 0 The molar ratio of AgNO is 20:1; 3 with particle stabilizer Na 3 The molar ratio of Cit is 1:1; AgNO 3 with reducing agent NH 2 NH 2 The molar ratio is 1:2. Stirring and reaction were continued for 3 minutes at room temperature, and two-dimensional fractal silver nanoparticles were obtained after the reaction was completed. The average particle size of the product is 182nm, and the average width of the branches is 19nm. The transmission electron microscope photos are as follows: figure 2 , the UV-Vis absorption spectrum as f...

Embodiment 3

[0025] Mix 3.0 mL of absolute ethanol with 1.91 mL of deionized water, and add 50 μL of the seeds prepared in Example 1 and 10 μL of AgNO with a concentration of 0.1 M under stirring conditions of 400 r / min. 3 , 10 μL of 0.1M Na 3 Cit, after mixing well, finally add 20 μL of 0.1M NH 2 NH 2 solution. The volume percentage of ethanol in the final solution is 60%, AgNO 3 The concentration is 0.2mM; AgNO 3 and Ag contained in spherical particles 0 The molar ratio of AgNO is 20:1; 3 with particle stabilizer Na 3 The molar ratio of Cit is 1:1; AgNO 3 with reducing agent NH 2 NH 2 The molar ratio is 1:2. Stirring and reaction were continued for 6 minutes at room temperature, and two-dimensional fractal silver nanoparticles were obtained after the reaction was completed. The average particle size of the product is 209nm, and the average width of the branch is 10nm. The transmission electron microscope photos are as follows: image 3 , the UV-Vis absorption spectrum as fig...

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Abstract

The invention provides a preparation method of two-dimensional fractal silver nanoparticles in an alcohol-water system, and belongs to the technical field of preparation of nano materials. The method comprises the specific steps of adding sodium citrate modified spherical silver particles, silver nitrate, sodium citrate and an aqueous solution of NH2NH2 to a mixed solvent of alcohol and water while agitating; reacting for 3 to 12min under the room temperature to obtain two-dimensional branch shaped silver nanoparticle sol. According to the method, the ratio of alcohol in the mixed solvent is simply changed to adjust and control the feature and optical performance of a product; the product is absorbed at the near infrared part, and is relatively high in reman activity. The method has the characteristics of being simple to operate, high in repeatability, environmentally friendly, and capable of expanding a reaction system to achieve mass production.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation, in particular to a preparation method of two-dimensional fractal silver nanoparticles in an alcohol-water system. Background technique [0002] Noble metal nanomaterials have excellent properties in electricity, light, heat, catalysis, etc., and have been more and more widely and deeply studied. Compared with other kinds of noble metal nanoparticles, silver nanoparticles have similar optical properties, but are cheaper, have stronger enhancement properties, and have unique properties such as antibacterial, so they have greater application value. The physical and chemical properties of nanoparticles are strongly dependent on the size and shape of the particles. The asymmetric shape and high specific surface area of ​​two-dimensional fractal silver nanoparticles make them useful in many aspects such as infrared hyperthermia, surface enhanced Raman, and catalysis. Exhibiting excell...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24B82Y40/00
Inventor 刘红杨文胜纪小会李军庄家骐王睿
Owner JILIN UNIV
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