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Method for preparing spherical silver nano granule

A silver nanoparticle and spherical technology, which is applied in the field of preparation of silver nanoparticles, can solve the problems of complex reaction system, complex reaction system, and many auxiliary materials in the preparation method, and achieve the effect of fewer types of raw materials, simple process, and stable dispersion

Inactive Publication Date: 2009-08-05
NINGBO UNIV
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  • Abstract
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Problems solved by technology

The reaction system of this invention patent is complex, requiring pH adjustment, silver halide pre-crystallization, and dialysis of silver halide in the preparation of the sol, in order to obtain silver nanoparticles with a wide particle size range and water content; therefore, the preparation method has a complex reaction system And more auxiliary materials are needed, and what is obtained is silver nanoparticles containing moisture, and there are quite a lot of silver nanoparticles materials that can only be applied in an anhydrous state

Method used

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  • Method for preparing spherical silver nano granule
  • Method for preparing spherical silver nano granule

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Embodiment

[0019] A preparation method of spherical silver nanoparticles, using analytically pure silver nitrate as a silver source, 0.06g of silver nitrate is dissolved in 160ml of absolute ethanol, and stirred until the solution is clear for use; about 0.17g of analytically pure silver containing -NH 2 Dissolve the triethanolamine reducing agent of group and -OH group in 40ml of absolute ethanol and stir until the solution is clear for use; dissolve about 0.024g of PVP in 40ml of absolute ethanol and stir until the solution is clear for use; Pour the three solutions into a 250ml Erlenmeyer flask, mix together and stir evenly, then put the Erlenmeyer flask into a water bath to heat with stirring and reflux, so that the temperature of the solution reaches 70-80°C until the solution turns transparent dark red, and then Stop heating and cool to room temperature to obtain silver nanoparticle colloidal solution, such as figure 2 As shown, the colloidal solution has an obvious surface plasmo...

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Abstract

The invention discloses a method for preparing spherical silver nanoparticles, which comprises the following steps: evenly mixing a silver nitrate clearing solution, a reducer clearing solution and a stabilizing agent clearing solution of anhydrous low mass molecule alcohols; stirring the mixture at a temperature of between 70 and 80 DEG C and refluxing the product to obtain a silver nanoparticle colloidal solution; and vaporizing or removing the low mass molecule alcohols, and drying the remaining substance to obtain the spherical silver nanoparticles with the particle size not more than 15 nanometers. A reaction system of the invention has simple process, saves raw materials, reduces links and improves preparation efficiency; in the reaction system, the anhydrous low mass molecule alcohols are taken as solvent to replace the prior water solution to prepare the anhydrous spherical silver nanoparticles; therefore, the invention discloses a method for preparing the anhydrous spherical silver nanoparticles with good dispersibility and stability, which has the advantages of simple process, few varieties of used raw materials and high preparation efficiency.

Description

technical field [0001] The invention relates to a preparation method of silver nanoparticles, in particular to a preparation method of spherical silver nanoparticles. Background technique [0002] Silver is a noble metal material with excellent ductility, thermal conductivity and electrical conductivity. It is chemically stable and does not react with oxygen and water, and does not react with hydrochloric acid, dilute sulfuric acid and strong alkali. Silver nanoparticles are widely used in the fields of conductive and magnetic materials, high-performance electronic pastes, high-efficiency catalysts and antibacterial agents. Among them, high-performance electromagnetic shielding coatings are widely used and have good market prospects. The annual demand reaches 600 tons (about 30% silver content); the annual demand for high-performance electronic paste reaches 200 tons (about 50% silver content). ). The development of high-performance electromagnetic shielding materials can ...

Claims

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Application Information

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IPC IPC(8): B22F9/24
Inventor 徐键董建峰沈亮标剪明明
Owner NINGBO UNIV
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