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Method for preparing silver nanoparticles of different sizes and particle assemblies of different shapes

A silver nanoparticle and assembly technology, applied in nanotechnology and other directions, can solve the problem of no colloidal sphere formation, and achieve the effects of efficient trace detection, high sensitivity and simple process

Inactive Publication Date: 2014-10-01
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

People have used the oil-water two-phase microemulsion method to prepare colloidal spheres containing a large number of initial nanoparticles, such as colloidal spheres of nanoparticles of different substances prepared by researchers at Tsinghua University (see Feng Bai, et al, A Versatile Bottom-up Assembly Approach to Colloidal Spheres from Nanocrystals, Angew.Chem.Int.Ed.2007,46,6650–6653), however, so far, there is no report on the effect of the original particle size on the formation of colloidal spheres

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  • Method for preparing silver nanoparticles of different sizes and particle assemblies of different shapes
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  • Method for preparing silver nanoparticles of different sizes and particle assemblies of different shapes

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preparation example Construction

[0015] The method for preparing silver nanoparticles of different sizes and particle assemblies of different shapes according to the present invention, its preferred embodiment includes the steps of: first preparing monodispersed silver of different sizes in the organic phase by thermal decomposition and reflux. Nanoparticles, and then use silver nanoparticles of different sizes to prepare assemblies with different shapes through the oil-water two-phase microemulsion method.

[0016] The thermal decomposition method is used to prepare silver nanoparticles with a size range of 7.0-11.3nm, which specifically includes: 84mg of AgNO with a mass concentration of 99.8% 3 It was mixed with 10.0 mL of oleylamine with a mass concentration of 80%, and argon gas was introduced at room temperature for 30 min, and then the temperature was rapidly raised to 180 ° C and maintained at this temperature for 30 min, and then gradually cooled to room temperature, and then the silver nanoparticles ...

specific Embodiment

[0024] Firstly, monodisperse silver nanoparticles in the organic phase were prepared, and then silver nanoparticles with different sizes were used to obtain assemblies with different shapes by the oil-water two-phase microemulsion method. The concrete operation steps of this preparation method are as follows:

[0025] 1. Preparation of silver nanoparticles:

[0026] 1. Preparation of silver nanoparticles (size range 7.0-11.3nm) by thermal decomposition method: 84mg (0.5mmol) AgNO 3 (tech.99.8%) and 10.0mL (28mmol) oleylamine (tech.80%, ACROS) were mixed and poured into a 100ml three-necked flask. After passing argon gas at room temperature for about 30 minutes, the temperature was raised rapidly to 180°C and kept at this temperature for 30 minutes. After the reaction was stopped, the system was gradually cooled to room temperature, and the particles were precipitated and centrifuged with ethanol, and then the product was dispersed in 4ml cyclohexane middle. Figure 1a , 1b...

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Abstract

The invention discloses a method for preparing silver nanoparticles with different sizes and particle assemblies with different shapes, which comprises the following steps: firstly, preparing monodispersed silver nanoparticles with different sizes in organic phases by using a thermal decomposition method and a reflux method; and then, preparing assemblies with different shapes from the silver nanoparticles with different sizes by using an oil-water two-phase micro-emulsion method. The method is simple in process, low in cost, simple in equipment and high in sensitivity, and used for implementing the trace detection of organic pollutants and the efficient adsorption and catalytic reduction of organic matters.

Description

technical field [0001] The invention relates to a method for preparing silver nanoparticles and particle assemblies thereof, in particular to a method for preparing silver nanoparticles of different sizes and particle assemblies of different shapes. Background technique [0002] The surface-enhanced Raman effect is of great significance in the trace detection of organic substances such as biology, medicine, and environment due to its advantages of rapidity, sensitivity, and low cost. In general, the SERS activity of silver is stronger than that of other metals such as gold and copper, so the preparation of silver-based SERS active substrates has attracted much attention. In addition, as a catalyst for many reactions (butadiene epoxidation, glucose oxidation, methanol oxidation, etc.), silver can efficiently catalyze the reduction of 4-nitrophenol to 4-aminophenol by sodium borohydride without harmful substance. People have used the oil-water two-phase microemulsion method ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24B22F1/00B82Y40/00
Inventor 刘艳颜张云霞李广海
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI