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Ni nanoparticle modified graphene and preparation method of wave-absorbing material

A nanoparticle and wave-absorbing material technology, applied in the field of functional material preparation, can solve the problem of difficult blending of magnetic nanoparticle-modified graphene, increased agglomeration tendency and stacking tendency between sheets, and the influence of uniform distribution of Ni nanoparticles on the surface, etc. problems, to achieve low reflectivity, low cost of raw materials, and low pollution

Active Publication Date: 2016-05-25
BEIHANG UNIV
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Problems solved by technology

However, during the reduction process, the oxygen-containing groups gradually decreased, and the tendency of agglomeration and stacking between the sheets increased, which made the dispersion of reduced graphene oxide in aqueous solution worse, and caused certain problems for the uniform distribution of Ni nanoparticles on its surface. influences
In addition, magnetic nanoparticle-modified graphene is difficult to blend with epoxy resin and has poor processability, which brings certain difficulties to its application in wave-absorbing composite materials.

Method used

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preparation example Construction

[0037] The present invention proposes a kind of preparation method of Ni nanoparticle modified graphene and wave-absorbing material thereof, prepares Ni nanoparticle modified graphene / epoxy resin wave-absorbing material by one-step method under hydrothermal condition, such as figure 1 As shown, it specifically includes the following steps:

[0038] Step 1: Prepare graphite oxide by Hummers method:

[0039] (1) Take graphite powder, KNO 3 The powder is mixed with concentrated sulfuric acid (the concentration of concentrated sulfuric acid is 75wt% ~ 98.3wt%), and the mixing ratio is to add 1.5 ~ 2g KNO to every 1.5g graphite powder 3 Powder, 65~69ml concentrated sulfuric acid, add KMnO when the obtained mixture is heated to 35~40℃ in water bath 4 Powder, the addition ratio is 8.0~9.5g KMnO per 1.5g graphite 4 , stir magnetically at 100-300r / min, and react for more than 6 hours; then slowly add deionized water to the mixture, and adjust the temperature of the water bath to 60°C-...

Embodiment 1

[0064] Graphite oxide was prepared according to step 1, and 100 mg of graphite oxide was dissolved in 100 ml of deionized water, and ultrasonically dispersed for 2 hours to fully peel off the graphite oxide sheets to obtain an aqueous solution of graphene oxide; add 0.5molNi(NO 3 ) 2 ·6H 2 O, ultrasonic dispersion for 1h, after stirring for 1h, dropwise add KOH solution (1M) to the solution, adjust the pH value of the solution to 10, slowly add hydrazine hydrate with a mass percentage concentration of 50%, and reduce graphene oxide and Ni 2+ , react for 2 hours, the solution turns dark brown; stir in a water bath at 60°C for 4 hours, the solution turns from dark brown to black, after the reaction, take out the black solution and wash it in a centrifuge until it is neutral, then vacuum it at 60°C Dry for 10 h, grind into fine powder to obtain Ni-modified graphene (Ni-rGO); dissolve the modified graphene in tetrahydrofuran to obtain a modified graphene suspension, and fix the r...

Embodiment 2

[0068] Prepare graphite oxide according to step 1, take 100mg graphite oxide and dissolve it in 100ml deionized water, ultrasonically disperse for 2 hours to fully peel off the graphite oxide sheet to obtain a graphene oxide aqueous solution; add 1molNiCl to the dispersed graphene oxide aqueous solution 2 ·6H 2 O, ultrasonic dispersion for 1h, after stirring for 1h, dropwise add KOH solution (1M) to the solution, adjust the pH value of the solution to 11, slowly add hydrazine hydrate with a mass percentage concentration of 80%, and reduce graphene oxide and Ni 2+, reacted for 3 hours, the solution turned brown; stirred in a water bath at 70°C for 4 hours, the solution turned from brown to black, after the reaction, the sample was taken out and washed with water in a centrifuge until neutral, then vacuum-dried at 70°C for 8 hours, Grind into fine powder to obtain Ni-modified graphene (Ni-rGO); the modified graphene is dissolved in acetone to obtain a modified graphene suspensio...

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Abstract

The invention discloses Ni nanoparticle modified graphene and a preparation method of a wave-absorbing material of Ni nanoparticle modified graphene and belongs to the technical field of preparation of function materials. Firstly, low-defect graphite oxide is prepared with an improved Hummers method and subjected to ultrasonic oscillating, graphene oxide is obtained, and graphene oxide and Ni<2+> are reduced with a reducer in one step, so that Ni nanoparticles are sufficiently adsorbed on the surface of graphene; then, a product is blended with epoxy resin for preparation of a nano wave-absorbing material. Compared with the wave-absorbing performance of the same type of wave-absorbing materials, the wave-absorbing performance of the Ni nanoparticle modified graphene wave-absorbing material is greatly improved, and the Ni nanoparticle modified graphene wave-absorbing material has both electric absorption and magnetic absorption capability and has a higher effective absorption bandwidth. According to the preparation method, the raw materials are low in cost and easy to obtain; the experiment conditions are easy to realize; the preparation method has the advantages of simplicity in operation and small pollution.

Description

technical field [0001] The invention belongs to a method for preparing inorganic modified graphene, relates to a method for preparing Ni-modified graphene by a low-temperature one-step reduction method, and then blending with epoxy resin to prepare a wave-absorbing material, belonging to the technical field of functional material preparation. Background technique [0002] Graphene is made of carbon atoms with sp 2 The monoatomic layer of hybrid connection is a two-dimensional allotrope of carbon discovered in recent years, with a theoretical thickness of only 0.35nm, which is the thinnest two-dimensional material discovered so far. Graphene has many excellent physical and chemical properties. For example, the strength of graphene is the highest among the tested materials, reaching 130GPa; its carrier mobility reaches 1.5×104cm 2 ·V -1 ·s -1 , which is twice that of the previously known indium antimonide material with the highest mobility, and has outstanding dielectric pr...

Claims

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Application Information

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IPC IPC(8): C08L63/00C08K9/02C08K9/12C08K3/04C08K3/08C09K3/00
CPCC08K3/04C08K3/08C08K9/02C08K9/12C08K2003/0862C08K2201/011C09K3/00C08L63/00
Inventor 肇研臧昕妍韩潇陈元王宇坤徐双双张海琴
Owner BEIHANG UNIV
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