CN103347377A - Method for preparing graphene/Co3O4 wave-absorbing material through hydrothermal method - Google Patents

Abstract

The invention provides a method for preparing a graphene/Co3O4 wave-absorbing material through a hydrothermal method. Graphene/Co3O4 nanometer materials and paraffin are mixed evenly, wherein the mass ratio of the graphene/Co3O4 nanometer materials to the paraffin is 1: 1. The mixed materials are pressed into an annular die which is 2.0mm in height, 7.0mm in outer diameter and 3.0mm in inner diameter to form a sample, the control thickness is 3.3mm, frequency is 13.8GHz, and the wave-absorbing performance can reach 43.7dB to the best. The graphene/Co3O4 nanocomposite is prepared according to the two-step method. The testing result shows that oxygen-containing functional groups of the graphite oxide in the RGO-Co3O4 nanometer materials are greatly reduced, GO is revivified to RGO, the formed Co3O4 nanometer particles are distributed on the surface of the RGO, and the grain diameter of each particle ranges from 5 nanometers to 15 nanometers.

Description

A kind of Hydrothermal Preparation Graphene/Co 3O 4The method of absorbing material

Technical field

The present invention relates to the extraordinary material of a kind of absorbing property, relate to the good Graphene/Co of a kind of absorbing property of a kind of Hydrothermal Preparation ₃O ₄Material.

Background technology

Graphene be a kind of have the bi-dimensional cellular nanostructure, by single carbon atom closely rearrange new carbon, it has bigger specific area, good conductivity, mechanical stability and thermal stability, therefore all is widely used at aspects such as electronic equipment, capacitor, compound enhancings.

We have prepared Graphene/Co with two-step method ₃O ₄(RGO-Co ₃O ₄) nano material and be applied to inhale the ripple application facet first.Utilize XRD, TEM is, and prepared nano material characterizes, and we are expected to possess application prospect widely at super capacitor material, electrode material and absorbing material etc. at the nano composite material of preparation.

Chinese invention patent---application number is that CN102702929A relates to " a kind of chiral polyaniline antiradar coatings and preparation method ".The antiradar coatings absorbing property that makes with this method is not very outstanding, and about coating thickness 2mm, the 8-18GHz average reflectance is-10.124dB.

Summary of the invention

For fear of the deficiencies in the prior art part, the present invention proposes the good Graphene/Co of a kind of absorbing property of a kind of Hydrothermal Preparation ₃O ₄Material has prepared Graphene/Co with two step method ₃O ₄(RGO-Co ₃O ₄) nano composite material.

Technical scheme

A kind of Hydrothermal Preparation Graphene/Co ₃O ₄The method of absorbing material is characterized in that step is as follows:

Step 1:0.1g Graphene adds ultrasonic 2h in the 100ml water, and adding 10ml concentration is 140g/L CoCl ₂6H ₂The O aqueous solution and 10ml concentration are to pour in the teflon-lined autoclave after the 94g/L NaOH aqueous solution stirs 2h;

Step 2: add the 4ml mass fraction in the autoclave and be 30% H ₂O ₂, and be placed in 160 ℃ of baking ovens and react 24h, the product with gained after the room temperature cooling spends deionised water for several times and is made into 100ml solution;

Step 3: be that 80% hydrazine hydrate solution adds above-mentioned solution with the 0.2ml mass fraction, in 95 ℃ behind the reaction 12h with ethanol and deionized water washing for several times, then with products therefrom in vacuum drying chamber 60 ℃ place 24h, namely obtain required Graphene/Co ₃O ₄Nano composite material;

Above-mentioned addition is a requirement of preparation.

Supersonic frequency control is at 45HZ in the described step 1, and ultrasonic time length is uniformly dispersed it.

Beneficial effect

A kind of Graphene/Co that the present invention proposes ₃O ₄The preparation method of nano wave-absorbing material is with Graphene/Co ₃O ₄Nano material is evenly mixed (mass ratio 1:1) with paraffin, and be pressed in the ring mould (high 2.0mm, external diameter 7.0mm, internal diameter 3.0mm) and make sample, control thickness 3.3mm, frequency 13.8GHz, absorbing property preferably reach-43.7dB.Prepared Graphene/Co with two step method of the present invention ₃O ₄(RGO-Co ₃O ₄) nano composite material, testing result shows: RGO-Co ₃O ₄The oxygen-containing functional group quantity of graphite oxide in the nano material (GO) significantly reduces, and GO has been reduced into Graphene (RGO); The Co that forms ₃O ₄Nano particle is distributed in the RGO surface, and its particle diameter is between 5-15nm.

Description of drawings

Fig. 1: the flow chart of the inventive method;

Fig. 2: Graphene/Co ₃O ₄The XRD spectra of nano wave-absorbing material;

Fig. 3: Graphene/Co ₃O ₄The TEM figure of nano wave-absorbing material;

Fig. 4: Graphene/Co ₃O ₄The absorbing property of nano wave-absorbing material.

Embodiment

Now in conjunction with the embodiments, accompanying drawing is further described the present invention:

1., the 0.1g Graphene adds ultrasonic 2h in the 100ml water embodiment 1:, adding 10ml concentration is 140g/LCoCl ₂6H ₂The O aqueous solution and 10ml concentration are to pour in the teflon-lined autoclave after the 94g/L NaOH aqueous solution stirs 2h; 2., adding the 4ml mass fraction in the autoclave is 30% H ₂O ₂, and be placed in 160 ℃ of baking ovens and react 24h, the product with gained after the room temperature cooling spends deionised water for several times and is made into 100ml solution; 3., be that 80% hydrazine hydrate solution adds above-mentioned solution with the 0.1ml mass fraction, in 95 ℃ behind the reaction 12h with ethanol and deionized water washing for several times, then with products therefrom in vacuum drying chamber 60 ℃ place 24h, namely obtain required Graphene/Co ₃O ₄Nano composite material.

1., the 0.1g Graphene adds ultrasonic 2h in the 100ml water embodiment 2:, adding 10ml concentration is 140g/LCoCl ₂6H ₂The O aqueous solution and 10ml concentration are to pour in the teflon-lined autoclave after the 94g/L NaOH aqueous solution stirs 2h; 2., adding the 4ml mass fraction in the autoclave is 30% H ₂O ₂, and be placed in 160 ℃ of baking ovens and react 24h, the product with gained after the room temperature cooling spends deionised water for several times and is made into 100ml solution; 3., be that 80% hydrazine hydrate solution adds above-mentioned solution with the 0.2ml mass fraction, in 95 ℃ behind the reaction 12h with ethanol and deionized water washing for several times, then with products therefrom in vacuum drying chamber 60 ℃ place 24h, namely obtain required Graphene/Co ₃O ₄Nano composite material.

1., the 0.1g Graphene adds ultrasonic 2h in the 100ml water embodiment 3:, adding 10ml concentration is 140g/LCoCl ₂6H ₂The O aqueous solution and 10ml concentration are to pour in the teflon-lined autoclave after the 94g/L NaOH aqueous solution stirs 2h; 2., adding the 4ml mass fraction in the autoclave is 30% H ₂O ₂, and be placed in 160 ℃ of baking ovens and react 24h, the product with gained after the room temperature cooling spends deionised water for several times and is made into 100ml solution; 3., be that 80% hydrazine hydrate solution adds above-mentioned solution with the 0.2ml mass fraction, in 95 ℃ behind the reaction 24h with ethanol and deionized water washing for several times, then with products therefrom in vacuum drying chamber 60 ℃ place 24h, namely obtain required Graphene/Co ₃O ₄Nano composite material.

Claims (1)

1. Hydrothermal Preparation Graphene/Co ₃O ₄The method of absorbing material is characterized in that step is as follows:

Step 1:0.1g Graphene adds ultrasonic 2h in the 100ml water, and adding 10ml concentration is 140g/L CoCl ₂6H ₂The O aqueous solution and 10ml concentration are to pour in the teflon-lined autoclave after the 94g/L NaOH aqueous solution stirs 2h;

Step 2: add the 4ml mass fraction in the autoclave and be 30% H ₂O ₂, and be placed in 160 ℃ of baking ovens and react 24h, the product with gained after the room temperature cooling spends deionised water for several times and is made into 100ml solution;

Step 3: be that 80% hydrazine hydrate solution adds above-mentioned solution with the 0.2ml mass fraction, in 95 ℃ behind the reaction 12h with ethanol and deionized water washing for several times, then with products therefrom in vacuum drying chamber 60 ℃ place 24h, namely obtain required Graphene/Co ₃O ₄Nano composite material;

Above-mentioned addition is a requirement of preparation.

Images