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Novel hydrothermal template agent of graphene oxide and preparation method of nanocomposite material of novel hydrothermal template agent

A composite material and graphene technology, applied in chemical instruments and methods, carbon compounds, ferrous oxides, etc., can solve the problems of reduced specific surface area, small electromagnetic wave absorption, low magnetic saturation strength of composite materials, etc., to achieve The effect of increasing electronic conductivity, large capacitance, and high conductivity

Active Publication Date: 2017-08-29
SHANDONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The graphene ferroferric oxide nanosphere composite material obtained by this method, but ferroferric oxide is piled up in the form of nanospheres, which reduces its specific surface area, and the reaction is carried out in an ethylene glycol organic system, which increases the removal of impurities Graphene oxide is only used as a reaction carrier in the reaction, and does not play its role as a template agent; Graphene oxide has poor dispersion in organic solvent ethylene glycol, and the prepared composite material has poor uniformity and low magnetic saturation strength of the composite material , Small absorption of electromagnetic waves, poor performance
[0006] In summary, in the prior art, the inducing template agent in the preparation process of ferric oxide nanowires has poor dispersibility, the introduction of other organic impurities increases the complicated impurity removal process, the specific surface area of ​​the obtained material is small, and the magnetic saturation is low. There is still no effective solution to problems such as low strength, small absorption of electromagnetic waves, and poor performance

Method used

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  • Novel hydrothermal template agent of graphene oxide and preparation method of nanocomposite material of novel hydrothermal template agent
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  • Novel hydrothermal template agent of graphene oxide and preparation method of nanocomposite material of novel hydrothermal template agent

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Effect test

Embodiment 1

[0070] The preparation process of the reduced graphene oxide / ferric oxide nanowire composite material, the specific steps are as follows:

[0071] Step 1: using the graphene oxide aqueous solution prepared by the improved Hummers method, washing the graphene oxide to pH = 4-6, and then using a vacuum freeze-drying method to prepare graphene oxide powder. At room temperature, 200 mg of graphene oxide was dissolved in 40 ml of water, ultrasonicated for 2 hours, and magnetically stirred for 6 hours to obtain a uniformly dispersed graphene oxide solution A.

[0072] Step 2: Dissolve 8g of sodium hydroxide (NaOH) into solution A, and magnetically stir for 1 hour to obtain solution B in which NaOH is completely dissolved.

[0073] Step 3: take by weighing 1.984g of sodium thiosulfate pentahydrate (Na 2 S 2 o 3 ·5H 2 O) and 4.448g of ferrous sulfate heptahydrate (FeSO 4 ·7H 2 O) mixing and pouring into a 50ml Teflon reactor lining, and pouring 40ml solution B into the reactor. ...

Embodiment 2

[0078] The preparation process of the reduced graphene oxide / cobalt trioxide nanowire composite material, the specific steps are as follows:

[0079] Step 1: using the graphene oxide aqueous solution prepared by the improved Hummers method, washing the graphene oxide to pH = 4-6, and then using a spray drying method to obtain graphene oxide powder. At room temperature, 200 mg of graphene oxide was dissolved in 40 ml of polyethylene glycol PEG200, PEG400, PEG600 or PEG aqueous solution as a reaction solution, ultrasonicated for 2 hours, and magnetically stirred for 6 hours to obtain a uniformly dispersed graphene oxide solution A.

[0080] Step 2: Dissolve 8g of sodium hydroxide (NaOH) into solution A, and magnetically stir for 1 hour to obtain solution B in which NaOH is completely dissolved.

[0081] Step 3: take by weighing 1.984g of sodium thiosulfate pentahydrate (Na 2 S 2 o 3 ·5H 2 O) and 4.496g of cobalt sulfate heptahydrate (CoSO 4 ·7H 2 O) mixing and pouring into...

Embodiment 3

[0086] The preparation process of the composite electromagnetic shielding coating containing reduced graphene oxide / ferric oxide nanowires, the specific steps are as follows:

[0087] Step 1: Weigh 6g of epoxy resin, put it into a 50ml beaker, add 4g of alcohol, and stir magnetically for 24 hours until the epoxy resin is evenly dispersed to obtain a mixed solution A with a mass fraction of epoxy resin of 60%.

[0088] Step 2: Weigh 6g of epoxy resin curing agent, add it to a 50ml beaker, add 4g of alcohol, and stir magnetically for 24 hours until the curing agent is evenly dispersed to obtain a mixed solution B with a mass fraction of epoxy resin curing agent of 60%.

[0089] Step 3: Weigh 1.3g of the reduced graphene oxide / ferric oxide nanowire composite and add it to the mixed solution A in step 1, stir it evenly with a glass rod, and mix it with the mixed solution B in step 2 to obtain the mass Fraction 10% EMI shielding paint.

[0090] Step 4: Coat the coating in step 3 o...

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Abstract

The invention discloses an application of graphene oxide in preparation of a hydrothermal reaction oxide nanowire. Through induced action of the graphene oxide, the oxide directionally grows in a hydrothermal synthesis process. The invention discloses a ferriferrous oxide nanowire synthesized by using the induced action of the graphene oxide. The ferriferrous oxide nanowire can be synthesized only by uniformly dispersing the graphene oxide into a reaction solution and then adding a ferriferrous oxide precursor, and the reaction can be completed in a water solution, so that the operation is simple, the cost is low, the material is compounded evenly. The obtained reduced graphene oxide / ferriferrous oxide composite material is large in specific surface area, the magnetic saturation intensity can reach 35-45emu / g, the electronic conductivity is high, the electric conductivity and the electromagnetic shielding property of the material are greatly improved, and further industrial application in the field of the ferriferrous oxide nanowire in the field of a positive electrode of a lithium battery, a supercapacitor and an electromagnetic shielding material.

Description

technical field [0001] The invention relates to the field of material preparation, in particular to a novel graphene oxide hydrothermal stencil agent and a method for preparing a nanocomposite thereof. Background technique [0002] Ferrite has the advantages of high absorbing efficiency, wide frequency band, and low cost. It is the earliest practical and most commonly used electromagnetic wave absorber. At the same time, Fe 3 o 4 As a lithium-ion battery anode material, it has a theoretical capacity of 926mAh / g, which is about 2.5 times that of graphite anode materials. It has the advantages of low cost, abundant raw material sources, safety and environmental protection, and is a promising lithium-ion battery anode material. However, transition metal oxides are prone to pulverization due to large volume changes in the process of lithium intercalation and deintercalation, and their poor electrical conductivity, so that part of the active materials lose effective electrical c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/198C01B32/194C01G49/08H01M4/36H01M4/52H01M4/62H01M10/0525H01M10/058H01G11/24H01G11/36H01G11/46H01G11/84
CPCC01G49/08C01P2002/88C01P2004/03H01G11/24H01G11/36H01G11/46H01G11/84H01M4/366H01M4/52H01M4/625H01M10/0525H01M10/058Y02E60/10Y02E60/13Y02P70/50
Inventor 慈立杰董成龙徐小燕陈丽娜李德平陈龙
Owner SHANDONG UNIV
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