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A kind of microcrystalline graphene composite material loaded with nano-silver and its preparation method and application

A technology of composite materials and microcrystalline graphite, which is applied in the field of microcrystalline graphene composite material loaded with nano-silver and its preparation, can solve the complex preparation method of graphene and nano-silver composite, the utilization of microcrystalline graphene, silver nanoparticles Uncontrollable size and density, etc., to achieve the effect of maintaining adsorption stability and durability, high activity and adsorption, and enhancing conductivity

Inactive Publication Date: 2019-03-01
HUNAN GUOSHENG GRAPHITE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] At present, although there have been some reports on graphene / silver nanocomposites, all of them use graphene prepared from flake graphite, and microcrystalline graphene is not utilized. At the same time, graphene prepared from flake graphite The preparation method of compounding with nano-silver is relatively complicated, and the size and density of silver nanoparticles grown on the surface of graphene are uncontrollable

Method used

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  • A kind of microcrystalline graphene composite material loaded with nano-silver and its preparation method and application
  • A kind of microcrystalline graphene composite material loaded with nano-silver and its preparation method and application
  • A kind of microcrystalline graphene composite material loaded with nano-silver and its preparation method and application

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preparation example Construction

[0036] Oxidized microcrystalline graphite used in the present invention is prepared by the following method:

[0037] First add microcrystalline graphite and sodium nitrate, add to concentrated sulfuric acid, slowly add potassium permanganate in an ice-water bath, keep stirring at low temperature for a period of time, raise the temperature of the solution to 40°C in the medium temperature stage, and keep it for half an hour, then in the high temperature stage Hydrogen peroxide is added dropwise to control the temperature of the solution at 70-90 degrees Celsius, the product is centrifuged and washed, and then dried to obtain it.

Embodiment 1

[0039] The present embodiment provides a kind of preparation method that is loaded with nano-silver microcrystalline graphene composite material, comprises the following steps:

[0040] S1. select microcrystalline graphite for use, adopt improved Hummers method to prepare microcrystalline graphite oxide;

[0041] S2. Dissolving the microcrystalline graphite oxide prepared in step S1 in water for secondary ultrasonic dispersion, and then obtaining a microcrystalline graphite oxide solution, the concentration of the microcrystalline graphite oxide solution is 0.02 to 0.04 g / L;

[0042] S3. After the substrate is cleaned and dried, surface treatment is carried out by a coupling agent, and then immersed in the microcrystalline graphite oxide solution prepared in step S2 to obtain a microcrystalline graphite oxide substrate; the substrate is silicon carbide or silicon oxide, and the coupling agent is Silane coupling agent, the inert gas is one or more of nitrogen, argon, helium;

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Abstract

The invention discloses a nanosilver supported microcrystalline graphene composite material as well as a preparation method and application thereof. The preparation method comprises the following steps: preparing a microcrystalline graphite oxide substrate from microcrystalline graphite; by taking silver as a target, performing electron beam bombardment and evaporation so as to form a silver reaction gas source, alternatively introducing the silver reaction gas source and an inert gas, growing on the microcrystalline graphite oxide substrate to form nanosilver, reducing in hydrazine steam, after the reaction is completed, cleaning with deionized water, performing low-temperature drying so as to obtain a nanosilver supported microcrystalline graphene composite material, and finally performing thermal treatment stabilization on the nanosilver supported microcrystalline graphene composite material. According to the composite material disclosed by the invention, nanosliver with positive electricity is supported on the surface of microcrystalline graphite oxide, so that the nanosliver support rate of the microcrystalline graphite oxide is increased, meanwhile the nanosilver can form a stable composite material on the surface of the graphite oxide, the microcrystalline graphene composite material obtained through reduction finally is high in activity and adsorption, and adsorption stability and durability can be maintained.

Description

technical field [0001] The invention relates to the field of graphene composite materials, more specifically, to a microcrystalline graphene composite material loaded with nano-silver and its preparation method and application. Background technique [0002] Graphene, is a sp 2 The hybridized carbon atoms form bonds in the form of a hexagonal lattice, and the formed two-dimensional planar single-layer structure of carbon is an allotrope of carbon. Graphene has good electrical and optical properties, mechanical properties, thermal conductivity and extremely high charge carrier mobility, as well as excellent mechanical strength and flexibility. These properties of graphene make it attract a lot of attention and quickly become a research hotspot. Graphene and its derivatives treated by chemical modification are materials with special functions, which can be used in transistors, liquid crystal devices, electrochemical biosensors, supercapacitors, fuel cells, solar cells, etc. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C14/18C23C14/30C23C14/58C01B32/184B82Y40/00B82Y30/00
Inventor 李丽萍林前锋
Owner HUNAN GUOSHENG GRAPHITE TECH CO LTD