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Fe-Co-RGO (iron-cobalt-reduced graphene oxide) composite wave absorbing material and preparation method thereof

A composite wave-absorbing material, fe-co technology, applied in chemical instruments and methods, and other chemical processes, can solve the problem of less porous magnetic particle-modified graphene, etc., to improve impedance matching, wave-absorbing performance, and saturation magnetization Improved effect

Active Publication Date: 2018-12-21
XIAN TECHNOLOGICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] At present, there are few studies on the preparation of porous magnetic particle-modified graphene, especially the metal-organic framework (ZIF-67) was used as a template to obtain Fe by in situ growth method. 3 o 4 Mosaic porous carbon materials have not been reported yet

Method used

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  • Fe-Co-RGO (iron-cobalt-reduced graphene oxide) composite wave absorbing material and preparation method thereof
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  • Fe-Co-RGO (iron-cobalt-reduced graphene oxide) composite wave absorbing material and preparation method thereof

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preparation example Construction

[0040] The invention relates to a Fe-Co-RGO composite wave-absorbing material and a preparation method thereof. Firstly, ultrafine water-soluble Fe is prepared by a hydrothermal method 3 o 4 particles (5-10nm), and then synthesize Fe through one-step in-situ growth method 3 o 4 Mosaic ZIF-67(Fe 3 o 4@ZIF-67), and further obtained Fe-Co alloy embedded nanoporous carbon material (Fe-Co) by carbonization at 700 °C. In the preparation of Fe 3 o 4 Graphene oxide was added to the process of @ZIF-67 and the same steps were repeated to obtain the nanoporous carbon material Fe-Co-RGO.

[0041] The cobalt-based imidazolate framework material (ZIF-67) adopted in the invention has high thermal stability, simple preparation process, is suitable for batch production, has large surface area and high porosity. It has high graphitization properties for carbon materials used as precursors, and has important conditions for the development of light microwave absorbing materials. Due to its...

Embodiment 1

[0071] (a) Water-soluble Fe 3 o 4 preparation of

[0072] (1) Mix 0.81g FeCl under magnetic stirring 3 ·6H 2 O and 0.76 g NaHCO 3 Dissolve in 30ml of distilled water, marked as A solution.

[0073] (2) At the same time, 0.088 g of L-ascorbic acid was dissolved in 10 ml of distilled water under magnetic stirring, and marked as B solution.

[0074] (3) After stirring solution A and solution B for 30 min, solution B was added dropwise to solution A to obtain mixed solution C.

[0075] (4) The mixture C was continuously stirred for 20 minutes, then transferred to a 100ml autoclave, kept at 150°C for 6 hours, and cooled naturally after the reaction was completed.

[0076] (5) For the obtained Fe 3 o 4 Collected by centrifugation, washed several times with deionized water and methanol, and finally dispersed in 10ml methanol solution for subsequent experiments.

[0077] (b) Fe 3 o 4 Preparation of @ZIF-67

[0078] (1) 2.63g 2-methylimidazole and obtained Fe 3 o 4 Dissol...

Embodiment 2

[0091] (a) Water-soluble Fe 3 o 4 preparation of

[0092] (1) Mix 0.81g FeCl under magnetic stirring 3 ·6H 2 O and 0.76 g NaHCO 3 Dissolve in 30ml of distilled water, marked as A solution.

[0093] (2) At the same time, 0.088 g of L-ascorbic acid was dissolved in 10 ml of distilled water under magnetic stirring, and marked as B solution.

[0094] (3) After stirring solution A and solution B for 30 min, solution B was added dropwise to solution A to obtain mixed solution C.

[0095] (4) The mixture C was continuously stirred for 20 minutes, then transferred to a 100ml autoclave, kept at 150°C for 6 hours, and cooled naturally after the reaction was completed.

[0096] (5) For the obtained Fe 3 o 4 Collected by centrifugation, washed several times with deionized water and methanol, and finally dispersed in 10ml methanol solution for subsequent experiments.

[0097] (b) Fe 3 o 4 Preparation of @ZIF-67

[0098] (1) 2.63g 2-methylimidazole and obtained Fe 3 o 4 Dissol...

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Abstract

The invention relates to a Fe-Co-RGO (iron-cobalt-reduced graphene oxide) composite wave absorbing material and a preparation method thereof. The preparation method comprises the following steps of preparing water-soluble Fe3O4 (ferroferric oxide) particles by a hydrothermal method, and synthesizing the Fe3O4-embedded ZIF-67 by a one-step in-situ growth method, so as to obtain Fe3O4@ZIF-67; further carbonizing, so as to obtain the Fe-Co alloy-embedded composite wave absorbing material Fe-Co; adding graphene oxide in the preparation process of Fe3O4@ZIF-67, and further carbonizing, so as to obtain the Fe-Co-RGO composite wave absorbing material. The preparation method has the advantages that the magnetic property of the material is improved by the high saturation magnetizing strength of theFe-Co alloy, the impedance matching property and wave absorbing property of the material are improved, and the theoretical support is provided for designing the ideal wave absorbing material with thewave absorbing characteristic; the maximum loss of the synthesized Fe-Co-RGO composite wave absorbing material reaches -53.1dB at the frequency of 10.1GHz, and the bandwidth of frequency for the lossgreater than -10dB reaches 2.9GHz (8.6 to 11.5GHz).

Description

technical field [0001] The invention belongs to the technical field of microwave absorbing materials, and in particular relates to a Fe-Co-RGO composite absorbing material and a preparation method thereof. Background technique [0002] With the rapid development of military, information, and electronic equipment, electromagnetic absorbing materials have attracted more and more attention from scientists. The military countries attach great importance to it, and the preparation of high-performance absorbing materials that meet the requirements of "thin, wide, light, and strong" is of great significance to the military and industrial fields. [0003] In recent years, graphene's two-dimensional structure has unique physical, chemical and mechanical properties, making it a potential application in fields such as sensors, fuel cells, bioscience and biotechnology, electromagnetic interference (EMI) shielding and microwave absorption. The defects and functional groups on the surfac...

Claims

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Application Information

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IPC IPC(8): C09K3/00
CPCC09K3/00
Inventor 王岩高翔吴新明王奇观张文治罗春燕
Owner XIAN TECHNOLOGICAL UNIV