Silvering graphite and preparation method thereof

Abstract

The invention discloses a silvered graphite and its producing method which is coated by outside plated nano graphite microchip. The method includes: making the nano graphite microchip orderly sensitize, activate, degelation pretreat, and re-disperse in the ethanol water solution, adding a certain amount of aminosilane as mother liquid; adding the silver nitrate into deionized water for dissolving, adding ammonia and / or sodium hydroxide to get [Ag(NH3)2]OH] solution, then feeding the reducing agent and [Ag(NH3)2]OH] solution into the mother liquid that finishing the nano graphite microchip silvering, filtering and washing, drying in vacuum to obtain silvered nano graphite microchip. The inventive silvered graphite has a high conductivity, a low density, a low cost, a low resistivity in which the pulverous volume resistivity is 8*10-5omegacm. The method has a simple craft, a low demanded device. The produced nano graphite microchip is silvered an even and continuous silver layer on surface with a high availability of silver nitrate.

Description

technical field [0001] The invention relates to a silver-plated graphite and a preparation method thereof, belonging to the technical field of chemical silver plating. The prepared silver-plated nano-graphite microchips can be used as conductive fillers in composite conductive polymers, electromagnetic shielding materials, and the like. Background technique [0002] With the development of modern science and technology, especially the rapid development of electronic industry and information technology, the demand for polymer materials with conductive properties is increasing day by day, and composite conductive polymers refer to high molecular polymers as the matrix, adding a considerable amount of Conductive material (such as carbon black, graphite, carbon fiber, metal powder, metal fiber, metal oxide, etc.) electrical and mechanical properties. [0003] Graphite / metal composite materials not only have the anisotropy of graphite, good lubricity and wear resistance, but als...

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Problems solved by technology

[0004] However, the limited conductivity of graphite limits the improvement of the conductivity of composite conductive polymers. In order to further improve the conductivity of composite materials, silver has the best electrical and thermal conductivity and the lowest contact resistance among all metals at room temperature. High efficiency and anti-oxidation and moisture resistance, so it is an ideal choice to prepare silver-plated graphite by electroless silver plating on the surface of nano-graphite microflakes