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Preparation method for silver nanocubes

A cube and silver nanotechnology, applied in the direction of nanotechnology, can solve the problems of uneven particle size control, long reaction time, poor repeatability, etc., and achieve the effect of uniform shape, high repeatability and high yield

Inactive Publication Date: 2014-03-26
JINGDEZHEN CERAMIC INSTITUTE
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0004] However, these methods have some disadvantages, such as long reaction time, non-uniform particle size control, low yield and poor reproducibility.

Method used

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  • Preparation method for silver nanocubes
  • Preparation method for silver nanocubes
  • Preparation method for silver nanocubes

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Step 1: Add 5mL ethylene glycol into a 50mL three-necked flask, heat it to 150°C with an oil bath, and keep the temperature constant at 150°C, then add 0.06mL 3mM sodium hydrosulfide ethylene glycol solution, 0.5mL 3mM HCl Diol solution, 1.25mL 20mg / mL PVP solution in ethylene glycol, and 0.4mL 200mM silver trifluoroacetate solution in ethylene glycol. The extent of the reaction was monitored by UV-visible absorption spectrum. When the UV-visible absorption peak appeared near 350 nm and 435 nm, the flask was taken out and immersed in an ice-water bath to terminate the reaction. After repeated centrifugal washing with ethanol and water, the nano-seeds Dispersed in water for preservation, the concentration of silver seeds is 9×10 20 cells / mL, with an average side length of 35 nm;

[0030] Step 2: Add 1.25mL ethylene glycol into a 10mL beaker, heat it to 150 ℃ with an oil bath, then add 0.3mL 20mg / mL PVP ethylene glycol solution, 200μL prepared in the first step with an a...

Embodiment 2

[0032] Add 1.25mL of ethylene glycol into a 10mL beaker and heat to 150°C with an oil bath. Then add 0.3 mL 20mg / mL PVP ethylene glycol solution, the average side length of 100 μ L embodiment 1 prepared in the first step is the silver nanocube seed of 35 nm and the ethylene glycol solution of 100 μ L 200mM silver nitrate, react after carrying out 3 h The flask was taken out and immersed in an ice-water bath to terminate the reaction, and silver nanocubes with an average side length of 56 nm were obtained, washed repeatedly with ethanol and water, and dispersed in water for storage.

Embodiment 3

[0034] Step 1: Add 5mL of ethylene glycol into a 50mL three-neck flask, heat it to 150°C with an oil bath, and keep the temperature constant at 150°C. Then add 0.06mL 3mM potassium sulfide ethylene glycol solution, 0.5mL 3 mM HCl ethylene glycol solution, 1.25mL 20mg / mL PVP ethylene glycol solution and 0.4mL 200mM silver trifluoroacetate ethylene glycol solution, and use UV-visible absorption The extent of the reaction is monitored by spectroscopy. When the ultraviolet-visible absorption peaks appear around 350 nm and 435 nm, the flask is taken out and immersed in an ice-water bath to terminate the reaction. After repeated centrifugation and washing with ethanol and water for several times, the nano-seeds are dispersed in water for storage , the concentration of silver seeds is 9х10 20 cells / mL, with an average side length of 35 nm;

[0035] Step 2: Add 1.25mL ethylene glycol into a 10mL beaker, heat it to 150 ℃ with an oil bath, then add 0.3mL 20 mg / mL PVP ethylene glycol so...

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Abstract

The invention relates to a preparation method for silver nanocubes. The silver nanocubes different in side length are prepared by adopting a seed growing method. The preparation method for the silver nanocubes comprises the following steps: firstly, preparing silver cube seeds of which the mean side length is 35nm by adopting ethylene glycol as solvent and a reducing agent, PVP (polyvinyl pyrrolidone) as a stabilizer, silver trifluoroacetate as a silver source and hydrochloric acid and soluble sulphurizing salt as adjuvants; then, preparing the silver nanocubes of which the mean side length is 40-160nm by adopting the ethylene glycol as the solvent and the reducing agent, the PVP as the stabilizer and soluble silver salt as the silver source by controlling the relative usage of the seeds and the silver salt. The method provided by the invention has the advantages that the operation is simple, the process is controllable, the obtained silver nanocubes are high in stability, and the silver nanocubes can be efficiently synthetized, and therefore, the preparation method for the silver nanocubes is broad in market prospect.

Description

technical field [0001] The invention relates to the technical field of nanometer functional materials, in particular to a method for preparing silver nanocubes. Background technique [0002] Silver nanomaterials have unique optical properties, electrical properties, catalytic properties, and excellent sensing and biological detection capabilities, so silver nanomaterials with various morphologies have been extensively studied. Compared with spherical, rice-shaped, rod-shaped, ribbon-shaped, and linear shapes, cubic silver nanoparticles have attracted the most attention. Silver nanocubes with sharp edges and uniform shapes can be used as highly sensitive localized plasmon sensing and surface-enhanced Raman substrates. Moreover, silver nanocubes can be used as sacrificial templates for the synthesis of cubic structures of various metals, such as Cu, Pb, Pt, and Au. [0003] At present, people have developed a variety of methods for preparing silver nanocubes, such as polyhyd...

Claims

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Application Information

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IPC IPC(8): B22F9/24B82Y40/00
Inventor 李菊梅江向平熊珊
Owner JINGDEZHEN CERAMIC INSTITUTE
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