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Method for surface modification of graphene by rare earth

A surface modification, graphene technology, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve the problems of poor dispersion, burning loss, poor matrix compatibility, etc., to improve the modification efficiency and modification. effect of effect

Inactive Publication Date: 2017-06-27
HENAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the above problems, the present invention provides a method for modifying graphene on the surface of rare earth, which overcomes the problems of poor compatibility with the substrate and poor dispersion of graphene in the application process; The chemical properties are easy to cause burning problems. This method is based on rare earth ions. Rare earth elements have outstanding chemical activity due to their special 4f electron layer structure. They are often used as surfactants and shallow infiltrated elements. Graphene can adsorb and desorb various properties of atoms and molecules to achieve

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] a. Under the condition of 298K, prepare 10mL mixed acid solution A with a volume ratio of 78% concentrated nitric acid and 98% concentrated sulfuric acid;

[0035] b. Weighing 1.2g of graphene and adding it to the mixed acid solution A for soaking for 1h, and performing surface roughening treatment to generate oxygen-containing groups such as hydroxyl, carboxyl, and epoxy groups on the surface of graphene, and then undergo multiple centrifugation , the speed of centrifugation is accelerated successively, then filtered, and then washed with deionized water for several times until the pH value is neutral, and dried at 80°C for 12 hours to obtain graphene with a roughened surface. The molecular structure of graphene is as follows figure 1 shown;

[0036] Wherein the multiple centrifugation speeds described in step b are divided into the following stages:

[0037] The rotation speed of 1~2 times of centrifugation is 2000~3500 r / min, and the time is 20~40min;

[0038] The...

Embodiment 2

[0048] a. Under the condition of 298K, prepare 15mL mixed acid solution A with 78% concentrated nitric acid and 98% concentrated sulfuric acid at a volume ratio of 1:2;

[0049] b. Weighing 1g of graphene is added to the mixed acid solution A and soaked for 2h, and the surface is roughened to make the surface of graphene generate oxygen-containing groups such as hydroxyl, carboxyl, epoxy, etc., and then through multiple centrifugation, The speed of centrifugation is accelerated successively, then filtered, and then washed with deionized water for several times until the pH value is neutral, and dried at 90°C for 18 hours to obtain graphene with a roughened surface, which is ready for use;

[0050] Wherein the multiple centrifugation speeds described in step b are divided into the following stages:

[0051] The rotation speed of 1~2 times of centrifugation is 2000~3500 r / min, and the time is 20~40min;

[0052] The speed of centrifugation for 3~4 times is 3500~5000 r / min, and t...

Embodiment 3

[0060] a. Under the condition of 298K, prepare 20mL mixed acid solution A with 78% concentrated nitric acid and 98% concentrated sulfuric acid at a volume ratio of 1:3;

[0061] b. Weigh 1.3g of graphene and add it to the mixed acid solution A to soak for 3 hours, and carry out surface roughening treatment, so that oxygen-containing groups such as hydroxyl, carboxyl, and epoxy groups are generated on the surface of graphene, and then undergo multiple centrifugal treatments , the speed of centrifugation is accelerated in turn, then filtered, and then washed with deionized water for several times until the pH value is neutral, and dried at a temperature of 100°C for 20 hours to obtain roughened graphene, which is set aside;

[0062] Wherein the multiple centrifugation speeds described in step b are divided into the following stages:

[0063] The rotation speed of 1~2 times of centrifugation is 2000~3500 r / min, and the time is 20~40min;

[0064] The speed of centrifugation for 3...

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Abstract

The invention provides a method for surface modification of graphene by rare earth. The method comprises the following steps: roughening the surface of the graphene to generate oxygen-containing groups such as hydroxyl, carboxyl and an epoxy group by the characteristic that various atoms and molecules can be adsorbed and desorbed by the graphene; then mixing the graphene with a rare earth nitrate solution after the surface of the graphene is roughened; generating a complex by surface groups and rare earth cations; and finally carrying out reduction to obtain the graphene subjected to surface modification by the rare earth. The method has the beneficial effects that by the strong electromagnetic interaction between the oxygen-containing groups on the surface of the graphene and the rare earth ions, the rare earth ions are adsorbed to the surface of the graphene, the process is simple and easy to operate, an impurity phase is not guided in, and the rare earth ions and the graphene are combined well.

Description

technical field [0001] The invention relates to the field of surface modification of graphene, in particular to a method for modifying the surface of graphene with rare earths, and to improve the research on problems such as poor dispersion of graphene and poor compatibility with a matrix. Background technique [0002] Graphene is a two-dimensional periodic honeycomb lattice structure composed of carbon six-membered rings, and is a general term for single-layer graphene, double-layer graphene and multi-layer graphene. Due to its unique molecular structure, graphene has many excellent properties far beyond metals: for example, the thermal conductivity of silver is the highest among metals, and its thermal conductivity is 429W / mK, while the thermal conductivity of single-layer graphene can reach 5300W / mK; The Young's modulus of alkene is greater than 1000GPa, and the tensile strength reaches 13GPa, which is 100 times that of steel. Because of these characteristics, graphene h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/194
Inventor 张柯柯张萌王悔改霍福鹏姚怀孙萌萌潘毅博
Owner HENAN UNIV OF SCI & TECH
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