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Method for preparing flower-like silver particles with controllable branch length through one-step method

A silver particle and flower-like technology is applied in the field of preparing flower-like silver particles with controllable branch length by one-step method, which can solve the problems of inability to control the flower branch length, high temperature reaction and long reaction time, short flower branch and the like, and achieves low cost and easy operation. The conditions of the reaction, the effects of the conditions that control the reaction

Active Publication Date: 2019-02-26
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, although there have been some reports on the preparation of flower-like silver particles, there are still some problems in the regulation of branch length.
Ma Xinfu used cysteine ​​to reduce silver nitrate under alkaline conditions to prepare flower-shaped silver particles, but the reaction needs to be completed after 4 hours at a high temperature of 70 °C, and there are problems of high temperature reaction and long reaction time (MaXinfu, Guo Qingquan, Xie Yu, Ma Haixiang, Chemical Physics Letters 652(2016) 148–151.); Xiao Shuang Shen, Guan Zhong Wang, etc. used sodium ascorbate to reduce silver nitrate in a 30°C water bath to obtain flower-shaped silver particles, but during the reaction Macromolecular PVP was introduced as a protective agent, and the flower branches of the obtained particles were short, and the flower branch length could not be regulated (Xiao Shuang Shen, Guan Zhong Wang, Xun Hong and Wei Zhu, Phys.Chem.Chem.Phys., 2009,11, 7450–7454.)

Method used

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  • Method for preparing flower-like silver particles with controllable branch length through one-step method
  • Method for preparing flower-like silver particles with controllable branch length through one-step method
  • Method for preparing flower-like silver particles with controllable branch length through one-step method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 0.25 mL of 10 mM AgNO 3 The solution was added to 9.75 mL of self-made high-purity water, mixed evenly under the stirring condition of 400 r / min, then 1.18 μL of APTES was added, and after stirring for 90 s, 25 μL of AA (ascorbic acid) with a concentration of 0.1M was added. In the final system, AgNO 3 At a concentration of 0.25mM, APTES and AgNO 3 The molar ratio of AA to AgNO is 2:1 3 The molar ratio is 1:1. After continuing to stir and react for 5min at room temperature, the silver particles with a flower branch length of 80nm were obtained, as shown in the transmission electron microscope. figure 1 .

Embodiment 2

[0022] 0.25 mL of 10 mM AgNO 3 The solution was added to 9.75mL self-made high-purity water, mixed evenly under the stirring condition of 400r / min, then 2.36μL of APTES was added, after stirring for 90s, 25μL of AA with a concentration of 0.1M was added. In the final system, AgNO 3 At a concentration of 0.25mM, APTES and AgNO 3 The molar ratio of AA to AgNO is 4:1 3 The molar ratio is 1:1. After continuing to stir and react for 5min at room temperature, the silver particles with a flower branch length of 30nm were obtained, as shown in the transmission electron microscope. figure 2 .

Embodiment 3

[0024] 0.25 mL of 10 mM AgNO 3 The solution was added to 9.75mL self-made high-purity water, mixed evenly under the stirring condition of 400r / min, then 4.72μL of APTES was added, after stirring for 90s, 25μL of 0.1M AA was added. In the final system, AgNO 3 At a concentration of 0.25mM, APTES and AgNO 3 The molar ratio of AA to AgNO is 8:1 3 The molar ratio is 1:1. After continuing to stir and react for 5min at room temperature, silver particles with a flower branch length of 10nm were obtained, as shown in the transmission electron microscope. image 3 .

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Abstract

The invention provides a method for preparing flower-like silver particles with controllable branch length through a one-step method, and belongs to the technical field of nano material preparation. The method comprises the specific steps that under a magnetic stirring condition, a silver nitrate aqueous solution and a silane coupling agent are added into ultrapure water, after mixing and stirringare performed for 90s, reducing agent ascorbic acid is added into the system, and the reaction is continued at room temperature for 3-5 min to obtain flower-like silver particles. The method can prepare the silver particles of different flowering lengths by simply adding different amounts of APTES, and has the advantages of simple operation, mild reaction conditions, low cost and environmental friendliness.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation, in particular to a method for preparing flower-shaped silver particles with controllable branch lengths in one step. Background technique [0002] In recent years, noble metal nanomaterials have been a research hotspot and have been widely used due to their unique optical, electrical, and catalytic properties. Among them, silver nanoparticles are widely used in many fields such as sensors, biology, and medical treatment due to their strong plasmonic effect in the visible light region. Silver nanoflowers have attracted extensive attention due to their anisotropic properties. The properties of silver nanoparticles have a great relationship with their morphology, and the length of flower branches is an important factor affecting the morphology of flower-like silver particles, so it is very important to realize the regulation of the length of flower-like silver particles. [0003] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B82Y40/00
CPCB22F9/24B82Y40/00
Inventor 吴清华巴静雯韩延东杨文胜
Owner JILIN UNIV