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Nano-silver/graphene composite material and preparation method thereof

A composite material and graphene technology, applied in metal processing equipment, coating, transportation and packaging, etc., can solve the problems of difficult control of load, low deposition rate, poor dispersion performance, etc., and achieve short process time, uniform distribution, The effect of small particle size

Inactive Publication Date: 2016-03-16
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

To a certain extent, it can overcome the defects of poor dispersion, low deposition rate, and difficult to control the loading capacity of conventional technical means, and is an effective green and environmental protection auxiliary means.

Method used

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  • Nano-silver/graphene composite material and preparation method thereof
  • Nano-silver/graphene composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A kind of nano silver / graphene composite material, its preparation method is as follows:

[0041] (1) At room temperature, add 100mg silver nitrate, 2ml concentrated ammonia water to 5ml deionized water to prepare silver ammonia solution, then add silver ammonia solution, 5mg sodium dodecyl sulfate (SDS), 6mg sodium citrate to 50ml anhydrous In water and ethanol, ultrasonically stir for 20 minutes to form a uniform mixed solution; then add 100 mg of graphene oxide and ultrasonically disperse for 1 hour to obtain a uniformly dispersed suspension;

[0042] (2) Dissolve 100mg of glucose in 5ml of deionized water, and mix this solution with the above mixture evenly, then quickly transfer it to a 100ml stainless steel reaction kettle, and pump in CO 2 Gas, pressurized to 8MPa and heated to 100°C;

[0043] (3) Stir and react the mixed solution in the reactor in step (2) at 300rpm for 1 hour, cool to room temperature, release the pressure and exhaust, centrifuge the precipita...

Embodiment 2

[0045] A kind of nano silver / graphene composite material, its preparation method is as follows:

[0046] (1) At room temperature, add 300mg silver nitrate and 2ml concentrated ammonia water to 5ml deionized water to prepare silver ammonia solution, then add silver ammonia solution, 10mg sodium dodecyl sulfate (SDS), 12mg sodium citrate to 50ml anhydrous In water and ethanol, ultrasonically stir for 15 minutes to form a uniform solution; then add 100 mg of graphene oxide, and ultrasonically disperse for 1.5 hours to obtain a uniformly dispersed mixed solution;

[0047] (2) Dissolve 200mg of glucose in 5ml of deionized water, and mix this solution with the above mixture evenly, then quickly transfer it to a 100ml stainless steel reaction kettle, and pump in CO 2 Gas, pressurized to 16MPa and heated to 50°C;

[0048] (3) Stir and react the mixed solution in the reaction kettle in step (2) at 550rpm for 2 hours, then cool to room temperature, release the pressure and exhaust, cen...

Embodiment 3

[0050] A kind of nano silver / graphene composite material, its preparation method is as follows:

[0051] (1) At room temperature, add 600mg silver nitrate and 2ml concentrated ammonia water to 5ml deionized water to prepare silver ammonia solution, then add silver ammonia solution, 15mg sodium dodecyl sulfate (SDS), 18mg sodium citrate to 50ml anhydrous In water and ethanol, ultrasonically stir for 10 minutes to form a uniform solution; then add 100 mg of graphene oxide, and ultrasonically disperse for 1 hour to obtain a uniformly dispersed mixed solution;

[0052] (2) Dissolve 400mg of glucose in 5ml of deionized water, and mix this solution with the above mixture evenly, then quickly transfer it to a 100ml stainless steel reaction kettle, and pump in CO 2 Gas, pressurized to 12MPa and heated to 75°C;

[0053] (3) Stir and react the mixed solution in the reaction kettle in step (2) at 800rpm for 0.5 hours, then cool to room temperature, release the pressure and exhaust, cent...

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Abstract

The invention discloses a nano-silver / graphene composite material and a preparation method thereof. The nano-silver / graphene composite material is synthesized through the supercritical carbon dioxide (ScCO2) assisted chemical deposition method. Firstly, a silver-ammonia solution is added into reductive alcohol, and an appropriate amount of a surfactant and a complexing agent are dissolved in the reductive alcohol; afterwards, graphene oxide powder is added, and homogeneously dispersed suspension liquid is obtained after ultrasonic dispersion; then a reducing agent is added, mixed liquid is quickly transferred into a reaction kettle, CO2 gas is pumped into the reaction kettle, the reaction kettle is heated to reach set pressure and a set temperature, and at the moment, the CO2 is in a supercritical state; and after a mixed solution is stirred and reacted for a period, cooling and pressure relief are carried out, and the nano-silver / graphene composite material is obtained after repeated centrifugal cleaning and drying. The preparation method is environmentally friendly, and the prepared nano-silver / graphene composite material has the characteristics that the phase is singular, the load capacity is controllable, and nano-silver is small in grain size and evenly distributed between graphene nanosheet layers.

Description

technical field [0001] The invention belongs to the technical field of inorganic synthesis of new materials, and in particular relates to a nano-silver / graphene composite material and a preparation method thereof. Background technique [0002] Nano-scale silver particles exhibit many unique properties due to nano-size effects, surface effects, etc., and have broad application prospects in the fields of conductivity, catalysis, and antibacterial. Graphene has a two-dimensional honeycomb-like planar structure full of π electrons, composed of carbon atoms with SP 2 It is the thinnest carbonaceous new material in the world, and the ideal single-layer graphene thickness is only 0.35nm. Graphene also has many superior physical and chemical properties, and is widely used in many fields such as electronics, sensing, and energy storage. The unique nanostructure and properties of graphene make it the basic unit of many new nanocomposites. Using graphene as a substrate and depositin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B22F1/02
CPCB22F9/24B22F1/17
Inventor 苏峰华孟元陈扬枝
Owner SOUTH CHINA UNIV OF TECH
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