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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 crystallization method, the particle size of the silver nano single crystal particle of cubic shape prepared by this method Less than 100nm, uniform particle size distribution, high product purity, regular shape, etc.

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
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Effect test

Embodiment 1

[0037] The tensio-active agent polyvinylpyrrolidone (PVP, molecular weight is 58000) that gets parts by weight is dissolved in the organic solvent ethylene glycol of 27.5 parts by weight; 27.5 parts of organic solvent ethylene glycol; after refluxing 44.2 parts of organic solvent at 160±5°C for 5 minutes, under magnetic stirring, the above two prepared solutions were fed differently from the reactor slowly into the reactor. After the addition was complete, the reaction was allowed to continue for 2 hours. Then, the system was allowed to cool down slowly to room temperature. A yellow-green cubic nano-silver sol was obtained, and particles with an average particle diameter of 50 nanometers were obtained.

Embodiment 2

[0039] The cubic silver nano sol prepared in Example 1 was evaporated at 155°C with a rotary evaporator to remove the organic solvent. Then adding ethanol or water to centrifuge and wash for several times to obtain solid powder of cubic silver nanocrystal particles. During the post-treatment process, there is no change in particle size and shape.

Embodiment 3

[0041] The silver nanocrystalline particle that the solid powder weight part that embodiment 2 obtains is that 1 part is redispersed in the ethanol solvent that the weight part is 99 parts, gets a small amount of sol and drips on the glass plate, spins film with spin coating instrument, can A bright, 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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