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Method for in-situ preparation of Au/graphene nanocomposite through supercritical CO2

A nano-composite material and in-situ preparation technology, which is applied in the field of supercritical CO2 in-situ preparation of Au/graphene nano-composite materials, can solve the problem of large size difference of nano-metal particles, uneven distribution of nanoparticles, low metal content, etc. problems, to achieve the effect of easy industrial implementation, high comprehensive macro performance and good batch performance

Inactive Publication Date: 2017-08-29
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Although the conventional chemical method is simple in process, low in cost, fast and convenient, there are still many defects, such as the large size difference of nano-metal particles, uneven distribution of nanoparticles, and low metal content.
Therefore, it is difficult to prepare high-quality composite materials by conventional chemical methods, and the batch performance is also poor.

Method used

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  • Method for in-situ preparation of Au/graphene nanocomposite through supercritical CO2
  • Method for in-situ preparation of Au/graphene nanocomposite through supercritical CO2
  • Method for in-situ preparation of Au/graphene nanocomposite through supercritical CO2

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Embodiment 1

[0039] Supercritical CO 2 In situ preparation of Au / graphene nanocomposites, the steps are as follows:

[0040] (1) Weigh 100mg graphene oxide, 100mg gold chlorate, 5mg sodium lauryl sulfate, add to 50ml ethanol, add 2ml aqueous solution containing 120mg glucose, ultrasonic treatment for 5min;

[0041] (2) Put the uniform dispersion liquid and magnetic stirrer into the reaction kettle, and introduce CO 2 Exhaust the air, pressurize and heat to 8Mpa and 150°C respectively, and react for 2h at a stirring speed of 400r / min;

[0042] (3) Release the pressure and cool at a speed of 0.2Mpa / min, wash the product repeatedly with absolute ethanol and deionized water 4 times, and dry it in vacuum. The obtained powder is the Au / graphene nanocomposite material.

[0043] figure 1 For the XRD diffraction pattern of the prepared Au / graphene nanocomposite material, it can be seen from the standard card that no other impurities exist.

Embodiment 2

[0045] Supercritical CO 2 In situ preparation of Au / graphene nanocomposites, the steps are as follows:

[0046] (1) Weigh 100mg of graphene oxide, 200mg of gold chlorate, 10mg of sodium dodecylbenzenesulfonate, add to 50ml of ethanol, add 2ml of aqueous solution containing 240mg of glucose at the same time, sonicate for 10min;

[0047] (2) Put the uniform dispersion liquid and magnetic stirrer into the reaction kettle, and introduce CO 2 Exhaust the air, pressurize and heat to 12Mpa and 120°C respectively, and react for 2h at a stirring speed of 600r / min;

[0048] (3) Release the pressure and cool at a speed of 0.3Mpa / min, wash the product repeatedly with absolute ethanol and deionized water 4 times, and dry it in vacuum. The obtained powder is the Au / graphene nanocomposite material.

[0049] The XRD diffraction pattern of the prepared Au / graphene nanocomposite is shown in figure 1 , but the intensity of the diffraction peak corresponding to the gold nanocrystals becomes la...

Embodiment 3

[0051] Supercritical CO 2In situ preparation of Au / graphene nanocomposites, the steps are as follows:

[0052] (1) Weigh 100mg graphene oxide, 200mg gold chlorate, 10mg sodium lauryl sulfate, add to 50ml ethanol, add 2ml aqueous solution containing 360mg glucose at the same time, sonicate for 10min;

[0053] (2) Put the uniform dispersion liquid and magnetic stirrer into the reaction kettle, and introduce CO 2 Exhaust the air, pressurize and heat to 12Mpa and 120°C respectively, and react at a stirring speed of 450r / min for 2h;

[0054] (3) Release the pressure and cool at a speed of 0.3Mpa / min, wash the product repeatedly with absolute ethanol and deionized water 4 times, and dry it in vacuum. The obtained powder is the Au / graphene nanocomposite material.

[0055] figure 2 The TEM image of the prepared Au / graphene nanocomposite material shows that the nano-gold crystals are granular, with a particle size of 5-10 nm, and are evenly distributed on the graphite wrinkled laye...

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Abstract

The invention discloses a method for in-situ preparation of an Au / graphene nanocomposite through supercritical CO2. Gold-bearing precursors and graphite oxides are used as raw materials in the method, the gold-bearing precursors are dissolved into the supercritical CO2 and cosolvents, the supercritical CO2 is utilized to strip oxidized graphene, gold ions and oxidized graphene functional groups are subjected to mutual electrostatic attraction, gold cores generated from the reaction carry out intercalation on graphene, gold nanocrystals after deposition are firmly adsorbed to a graphene sheet layer, control over loads is realized by adjusting the reaction temperature and pressure, and the Au / graphene nanocomposite with uniformly-distributed gold nano particles having fine particle diameters is prepared. The preparation method is simple, efficient and environmentally friendly, and the prepared Au / graphene nanocomposite has the characteristics of good batch performance, small gold nano particle diameters, uniform distribution and a large load quantity and has wide and important application prospects in the fields such as lubrication, catalyzation and energy accumulation.

Description

technical field [0001] The invention belongs to the technical field of preparation of functional materials, in particular to a supercritical CO 2 Method for in situ preparation of Au / graphene nanocomposites. technical background [0002] Nanocomposite materials have the characteristics of general nanoparticles, which are reflected in size effect, volume effect, surface interface effect, and local field effect, which cause significant differences in the macroscopic properties of nanomaterials such as light, point, heat, sound, and magnetism. In addition, nanocomposites often produce strong combinations of the advantageous properties of their components, exhibiting stronger macroscopic properties. Therefore, the research on nanocomposite materials has become a hot spot in the scientific and technological circles and industrial circles of various countries. [0003] At present, there are many physical and chemical methods for preparing metal / carbon nanocomposites. Among them...

Claims

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Application Information

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IPC IPC(8): B22F9/24B82Y40/00
CPCB22F9/24B22F2999/00B82Y40/00B22F2202/03
Inventor 苏峰华孟元陈扬枝
Owner SOUTH CHINA UNIV OF TECH
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