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Synthetic method capable of realizing encapsulation of materials by graphene in shape maintaining manner

A synthesis method and graphene technology are applied in the synthesis field of realizing the conformal encapsulation of materials by graphene, which can solve the problems of restricted application fields and scope of use, difficulty in large-scale production, and complicated operation, and achieve a simple, convenient and easy synthesis method. Expandable, maneuverable effects

Inactive Publication Date: 2015-12-30
TIANJIN NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with anchoring and inclusions, graphene encapsulation has more obvious advantages, such as conformal covered graphene can enhance structural stability, and can effectively prevent internal material oxidation, dissolution, corrosion and other side reactions caused by the external environment. , but the first two types of composite forms are the most common and easy to realize; while the realization of graphene encapsulation is rarely reported, spray-cracking, capillary compression, pre-pressure release and other methods can be used to achieve graphene encapsulation, but only limited to specific Reaction system, complex operation and high cost, making it difficult to apply to large-scale production, which greatly restricts the application field and scope of use of this type of material
Therefore, it is still a great challenge to develop a simple, efficient, and scalable method for constructing graphene conformally encapsulated composite structures.

Method used

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  • Synthetic method capable of realizing encapsulation of materials by graphene in shape maintaining manner
  • Synthetic method capable of realizing encapsulation of materials by graphene in shape maintaining manner
  • Synthetic method capable of realizing encapsulation of materials by graphene in shape maintaining manner

Examples

Experimental program
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Effect test

Embodiment 1

[0017] (1) Firstly, the modified Hummers method was used to prepare graphite oxide

[0018] 1. Accurately weigh 1kg graphite powder and 500gNaNO 3 and mix it evenly; 2. Under the condition of ice-water bath, add 5000mL concentrated H 2 SO 4 Stir well, then slowly add 1.5kgKMnO 4 Stir for 1 hour; 3. Add 50000 mL of 5% H 2 SO 4 Stir for 1 hour; 4. Add appropriate amount of hydrogen peroxide (H 2 o 2 ) Stirring; 5. Cleaning: Wash until pH = 7, and graphite oxide is obtained.

[0019] (2) Next, prepare graphite oxide-glycerol dispersion:

[0020] 1. Accurately weigh 1g of the above-mentioned graphite oxide; 2. Use a 1L measuring cylinder to take 500ml of glycerol solution, transfer it to a 1L beaker for later use; 3. Transfer the weighed graphite oxide into the glycerol solution, Slightly oscillate, and then use an ultrasonic cell pulverizer to sonicate for 30 to 60 minutes to obtain a graphite oxide-glycerol dispersion; 4. Centrifuge the above dispersion at 10,000 rpm for...

Embodiment 2

[0024] (1) The specific operation for preparing graphite oxide is the same as in Example 1.

[0025] (2) Prepare graphite oxide-ethylene glycol dispersion: 1. Accurately weigh 2g of the above-mentioned graphite oxide; 2. Take 500ml of ethylene glycol solution with a 1L measuring cylinder, transfer it to a 1L beaker, and set aside; 3. Put The weighed graphite oxide was transferred into the ethylene glycol solution, slightly oscillated, and then ultrasonicated for 30 to 60 minutes with an ultrasonic cell pulverizer to obtain a graphite oxide-ethylene glycol dispersion; Centrifuge at a high speed for 15-30 minutes to obtain a 4 mg / ml graphite oxide-ethylene glycol dispersion.

[0026] (3) Use one-step solvothermal to prepare composite materials for graphene conformal packaging: 1. Accurately measure 3L of isobutanol solution, transfer it to a 5L stainless steel reaction kettle, and set aside; 2. Accurately weigh 8g of tin dioxide (SnO 2 ), and uniformly disperse it in the above-...

Embodiment 3

[0028] (1) The specific operation for preparing graphite oxide is the same as in Example 1.

[0029] (2) Preparation of graphite oxide-ethanol dispersion: 1. Accurately weigh 0.1g of the above-mentioned graphite oxide; 2. Take 500ml of ethanol solution with a 1L graduated cylinder, transfer it to a 1L beaker, and set aside; 3. Take the weighed Transfer the graphite oxide into the ethanol solution, oscillate slightly, and then use an ultrasonic cell pulverizer to sonicate for 30 to 60 minutes to obtain a graphite oxide-ethanol dispersion; 4. Centrifuge the above dispersion at a rate of 10,000 rpm for 15 to 30 minutes, A 0.2 mg / ml graphite oxide-ethanol dispersion can be obtained.

[0030] (3) Using one-step solvothermal preparation of composite materials for graphene conformal packaging: 1. Accurately measure 3L of n-butanol solution and transfer it to a 5L stainless steel reaction kettle for later use; 2. Accurately weigh 2g of zinc stannate (Zn 2 SnO 4 ), and uniformly disp...

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Abstract

The invention discloses a preparation method capable of realizing encapsulation of materials by graphene in a shape maintaining manner. The method comprises the following steps: uniformly dispersing graphite oxide-alcohol dispersion liquid and a to-be-encapsulated power raw material in another appropriate alcohol solvent, so as to form a mixed system, wherein the mass ratio of graphite oxide-alcohol dispersion liquid to the to-be-encapsulated power raw material is (4:1)-(1:20); transferring the mixed system into a reaction kettle with an appropriate volume, after sealing, performing treatment at a specified temperature for a period of time, so as to obtain the expected product. The synthetic method provided by the invention is simple, convenient and fast, environment-friendly, highly efficient, high-flexibility, strong in operability, easy to develop, high in repeatability, stable in batches and strong in practicability, enriches the synthetic method of graphene encapsulation materials, overcomes the scientific problem of great difficulty in construction of graphene encapsulation composite structures, and is expected to accelerate and promote development and application of graphene based function materials.

Description

technical field [0001] The invention relates to adopting a general reaction system to realize the conformal encapsulation of materials by graphene, especially a synthetic method generally applicable to encapsulation of multi-element compound materials such as metals, non-metallic substances, oxides, and sulfides. Background technique [0002] Graphene is a two-dimensional periodic honeycomb lattice structure composed of carbon six-membered rings, which can be warped into zero-dimensional fullerenes, rolled into one-dimensional carbon nanotubes or stacked into three-dimensional graphite. It is the basic unit of other graphite materials, so it has many excellent properties of graphite and carbon nanotubes, such as high electronic conductivity, high specific surface area and high mechanical strength, making it widely used in electronics, information, energy, materials, etc. And biomedicine and other fields have broad application prospects. Another important direction of graphe...

Claims

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Application Information

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IPC IPC(8): C01B31/04
Inventor 李喜飞白志民颜波李德军孙学良
Owner TIANJIN NORMAL UNIVERSITY