Preparing method for cubic silver nanometer grain

A technology of nanocrystals and silver nanoclusters, which is applied in the field of preparation of cubic silver nanocrystal particles, to achieve the effects of high degree of particle crystallization, good controllability of particle size, and good self-assembly performance

Inactive Publication Date: 2004-12-08
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The object of the present invention is to overcome the inhomogeneity of existing silver nanoparticle, provide a kind of method that prepares cubic silver nanocrystalline particle with supersaturated solution c

Method used

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  • Preparing method for cubic silver nanometer grain
  • Preparing method for cubic silver nanometer grain
  • Preparing method for cubic silver nanometer grain

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0036] Example 1

[0037] Take 0.4 parts by weight of surfactant polyvinylpyrrolidone (PVP, molecular weight 58000) and dissolve it in 27.5 parts by weight of organic solvent ethylene glycol; take 0.4 parts by weight of silver nitrate and dissolve it in parts by weight 27.5 parts of organic solvent ethylene glycol; 44.2 parts by weight of organic solvent is refluxed at 160±5℃ for 5 minutes, and under magnetic stirring, the above two prepared solutions are fed differently from the reactor Add slowly to the reactor. After the addition is complete, let the reaction continue for 2 hours. Then, let the system slowly cool down to room temperature. The yellow-green cubic nano silver sol is obtained, and particles with an average particle diameter of 50 nanometers are obtained.

Example Embodiment

[0038] Example 2

[0039] The cubic silver nanosol prepared in Example 1 was evaporated to remove the organic solvent with a rotary evaporator at 155°C. Then, ethanol or water is added for centrifugation and cleaning for multiple times to obtain cubic silver nanocrystalline particle solid powder. During the post-treatment process, there is no change in particle size and shape.

Example Embodiment

[0040] Example 3

[0041] Re-disperse the silver nanocrystalline particles with 1 part by weight of the solid powder obtained in Example 2 in 99 parts by weight of ethanol solvent, take a small amount of sol and drop it on the glass plate, and spin the film with a spin coater. A bright and uniform conductive film is obtained.

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Abstract

A process for preparing the cubic silver nanocrystals includes such steps as proportionally dissolving surfactant and silver nitrate in organic solvent while stirring, slowly adding to an organic solvent at 150-180 deg.C to obtain the saturated solution of Ag nanoparticles, continuous reacting, and slow cooling while stirring to obtain the sol of cubic silver nanocrystals. Its advantage is high purity and dispersity.

Description

technical field [0001] The invention belongs to the technical field of nanostructure materials, and in particular relates to a series of preparation methods of cubic silver nanocrystal particles. Background technique [0002] At present, the silver nanoparticles prepared at home and abroad are generally spherical. Even if particles of other shapes, such as hexagonal, triangular, and cubic shapes, are prepared, there are still many problems. In some samples, the particles of the desired shape account for the total number of particles. The proportion of the sample is very small, and some samples have a large particle size and a wide size distribution. Particles with a size greater than 100 nanometers cannot produce quantum confinement effects, and their applications in the field of microelectronics are limited. Reports in this regard can be found in Science, 2002, 298: 2176-2179. and J. Colloid Surface Sci. 2003, 258, p244. However, so far, we have no...

Claims

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Application Information

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IPC IPC(8): B22F9/24
Inventor 刘春艳李永军张志颖
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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