CN109494038A - Ferroso-ferric oxide-nanoporous carbon nano-composite material and the preparation method and application thereof - Google Patents
Ferroso-ferric oxide-nanoporous carbon nano-composite material and the preparation method and application thereof Download PDFInfo
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Abstract
The present invention relates to ferroso-ferric oxide-nanoporous carbon nano-composite materials and the preparation method and application thereof.The present invention is finally obtained Fe using Fe Base Metal organic framework material as template, by regulating and controlling Thermal Decomposition Parameters3O4Nanoporous carbon nano-composite material.Experimental verification, the nanocomposite preparation method have the characteristics that stable, controllable, simple to operation, and the material has excellent electro-magnetic wave absorption ability.Therefore, the present invention provides a kind of novel thinking for the design and synthesis of industrial production electromagnetic wave absorbent material.
Description
Technical field
The present invention relates to the electromagnetic wave absorbent materials in field of functional materials, more particularly, to a kind of Fe3O4Nanoporous
Carbon nano-composite material and the preparation method and application thereof.
Background technique
Nowadays, with Radar Technology, the fast development of electronic equipment, wireless communication technique, electromagnetic radiation and interference are in day
Often increasingly severe in life, this not only threatens the health of the mankind, can also interfere electromagnetic equipment, leads to electromagnetic equipment in military affairs
The application in domain brings problem.In order to solve the problems, such as that these are serious, in the past few decades in, it is high that people have been working hard exploitation
The electromagnetic wave absorbent material with wide strong absorbability, broad absorption band, lightweight, thin matching thickness of effect.In general, according to
Electromagnetic wave loss characteristic, electromagnetic wave absorbent material can be divided into dielectric material and magnetic material two major classes.It is well known that carbon material,
Magnetic metal and Ferrite Material are widely used in manufacturing electromagnetic wave absorbent material.
In magnetic material, Fe3O4Nano particle with its low cost, chemical stability, environmental protection, high absorption property and by
Concern.Although about Fe3O4The extensive work of base wave-absorbing material reports, but the absorption band width of magnetic material, thickness it is big,
The big equal various problems of density limit magnetic material in the practical application in electro-magnetic wave absorption field.On the other hand, carbon material example
The advantages that such as carbon fiber has hardness high, the small light weight of density, Absorber Bandwidth, but its relatively high complex dielectric permittivity and compared with
The magnetic conductivity of difference causes impedance mismatching seriously to limit carbon material in the application in electro-magnetic wave absorption field.Therefore, for single
For dielectric material or magnetic material, it is difficult to realize high electromagnetic wave absorption performance.To overcome the above disadvantages, a kind of effective
Method is the composite material of well-designed magnetic material and dielectric material, to utilize synergistic effect between the two.Such as
Fe3O4With TiO2It is compound, Fe3O4It is compound with carbon nanotube, NiZn ferrite and graphene are compound etc..Although by magnetic material with
Carbon material is compound, and electromagnetic wave absorption performance has substantive raising.However, how to pass through the optimization of simple structure and ingredient
To prepare high performance electromagnetic wave absorbent material, there are still certain difficulty.
Summary of the invention
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide a kind of Fe3O4Nanoporous
Carbon nano-composite material and the preparation method and application thereof.Nanocomposite of the present invention has excellent electromagnetic wave absorption performance,
And it can be by simply chemically reacting and heat treatment process obtains excellent, stable electromagnetic wave absorption performance.
The purpose of the present invention can be achieved through the following technical solutions:
The present invention provides a kind of FeaObThe preparation method of nanoporous carbon nano-composite material, using Fe-MOFs as mould
Plate is heat-treated Fe-MOFs, obtains FeaObNanoporous carbon nano-composite material.
Wherein a=3, b=4, the FeaObNanoporous carbon nano-composite material is Fe3O4Nanoporous carbon nanometer is multiple
Fe is prepared in condensation material3O4The heat treatment condition of nanoporous carbon nano-composite material are as follows: heat treatment temperature: 500-700
DEG C, soaking time: 5-120min, heating rate: heating rate: 1-40 DEG C/min.
Further, heat treatment is carried out in nitrogen or argon atmosphere.
Wherein a=2, b=3, the FeaObNanoporous carbon nano-composite material is Fe2O3Nanoporous carbon nanometer is multiple
Fe is prepared in condensation material2O3The heat treatment condition of nanoporous carbon nano-composite material are as follows: heat treatment temperature: 300-500
DEG C, soaking time: 10-60min, heating rate: 1-40 DEG C/min.
Further, heat treatment is to carry out in air or in oxygen.
Further, the Fe-MOFs be by ferric chloride hexahydrate and terephthalic acid (TPA) in n,N-Dimethylformamide
Hydro-thermal reaction is prepared.
Further, the ratio between amount of the ferric chloride hexahydrate, terephthalic acid (TPA), n,N-Dimethylformamide substance=1:
1:(282-1130)；
Hydrothermal reaction condition are as follows: 100-150 DEG C of reaction temperature, soaking time 2-24 hours.
The invention also includes the Fe of above-mentioned preparation method preparation3O4Nanoporous carbon nano-composite material.
The invention also includes the Fe of above-mentioned preparation method preparation2O3Nanoporous carbon nano-composite material.
The invention also includes the Fe3O4Fe described in nanoporous carbon nano-composite material or claim 92O3Nanometer
Application of the porous carbon nano-composite material as electromagnetic wave absorbent material.
Metal-organic framework materials, which refer to, to be made of metal (cluster) and the ligand with high surface area and effecive porosity
A kind of material is considered as the ideal candidates of fuel storage, gas absorption and catalytic applications.Importantly, MOFs material
There is numerous nano-pores in (metal organic framework compound, English name Metal organic Framework) structure and opens
The duct for putting formula is the ideal mould material for preparing nano-pore carbon material.In the present invention, Fe Base Metal organic frame nano material
It is a kind of MOFs material.
The present invention by the thermal decomposition condition of suitable control MOFs, it is available be dispersed in it is porous it is carbon-based in metal
Or metal oxide nanoparticles composite material.
Therefore, the present invention is used using Fe Base Metal-organic framework material as the easy-to-use preparation method of template and is made
The standby Fe for possessing high absorbing property3O4Nanoporous carbon nano-composite material.
The present invention realizes preparation Fe by chemical synthesis and heat treatment3O4Nanoporous carbon nano-composite material, simultaneously
Have the advantages that excellent comprehensive electromagnetic wave absorbs.Especially preparation is simple, controllable stable, therefore advances work significantly
Industry metaplasia produces, to Fe3O4The extensive use and development of nanoporous carbon nano-composite material have great importance.
Compared with prior art, the present invention has the following advantages and beneficial effects:
1. the present invention is prepared for Fe Base Metal organic frame nano material by chemical synthesis.
2. present invention preparation Fe3O4Nanoporous carbon nano-composite material, while there is excellent comprehensive electromagnetic wave to absorb,
RLminFor -65.7dB, inhaling wavestrip wide (RL < -10dB) is 4.2-18GHz.
3. preparation is simple by the present invention, controllable stable, therefore advances industrialized production significantly, to Fe3O4It receives
The extensive use and development of meter Duo Kong carbon nano-composite material have great importance.
Detailed description of the invention
1 (Fe of Fig. 1 embodiment2O3@NPC), 2 (Fe of embodiment3O4@NPC) XRD spectrum.
1 (Fe of Fig. 2 embodiment2O3@NPC), 2 (Fe of embodiment3O4@NPC) and comparative example (Fe-MOFs) magnetic hysteresis return
Line.
Fig. 3 is from top to bottom comparative example (Fe-MOFs), 1 (Fe of embodiment2O3@NPC) and 2 (Fe of embodiment3O4@
NPC SEM (left side) and TEM (right side) image).
Fig. 4 comparative example (Fe-MOFs), 1 (Fe of embodiment2O3@NPC) and 2 (Fe of embodiment3O4@NPC) specific surface
Product.
The absorbing property of Fig. 5-1. comparative example (Fe-MOFs).
1 (Fe of Fig. 5-2. embodiment2O3@NPC) absorbing property.
2 (Fe of Fig. 5-3. embodiment3O4@NPC) absorbing property.
Fig. 5-1, Fig. 5-2, in Fig. 5-3,0.5,1.0,1.5,2.0,2.5,3.0,3.5,4.0,4.5,5.0 corresponding lines refer to
For the lines of image in figure from top to bottom.
Specific embodiment
Present invention is further described in detail for embodiment with reference to the accompanying drawing, it should be pointed out that implementation as described below
Example is intended to convenient for the understanding of the present invention, and does not play any restriction effect to it.
The present invention provides following specific embodiment, the performance of various combination embodiments is disclosed, and analyzes each experiment
Effect of the parameter in system.Accordingly, it is to be understood that this patent, which is specifically recorded, discloses all possible of the technical solution
Combination.
Embodiment 1:
In the present embodiment, product obtained is Fe2O3Nanoporous carbon nano-composite material.
Above-mentioned Fe2O3Nanoporous carbon nano-composite material the preparation method is as follows:
(1) terephthalic acid (TPA) of the ferric chloride hexahydrate of 622mg and 382mg are successively added to the N of 50ml, N- dimethyl methyl
In amide, stirring 30 minutes at 25 DEG C makes it sufficiently dissolve and be uniformly mixed.
(2) step (1) acquired solution is transferred in Teflon water heating kettle and is cooled to room temperature afterwards for 24 hours in 100 DEG C of heat preservations, later
Precipitating after liquid is centrifuged.
(3) step (2) resulting product is first used n,N-Dimethylformamide liquid rinse 3 times, then clear with alcohol liquid
It washes 3 times.
(4) step (3) products therefrom is dried under vacuum.
(5) furnace cooling after powder is warming up to 300 DEG C and keeps the temperature 30 minutes in air environment with furnace is made in step (4)
To room temperature.
Product obtained above is detected as follows:
(A) magnetic performance of product is obtained by physical property measurement system (Quantum Design Inc.'s manufacture).
(B) scanning electron microscope (abbreviation SEM, similarly hereinafter), transmission electron microscope (abbreviation TEM), high score is respectively adopted
Distinguish that transmission electron microscope (abbreviation HRTEM, similarly hereinafter) observes sample topography.
(C) it is Cu-K α that irradiation source, which is respectively adopted,X-ray diffraction (abbreviation XRD, similarly hereinafter) determine sample
Crystal structure.
(D) the laser low temperature matrix separation Raman spectrum system that 532nm is respectively adopted divides the Raman spectrum of sample
Analysis.
(E) nitrogen adsorption-release profiles of Quad-rasorb-SI instrument record sample are respectively adopted, and use Brunauer-
The specific surface area of Emmett-Teller (BET) method measurement sample
(F) it is surveyed by Agilent N5224A vector network analyzer using coaxial axis method in the frequency range of 2-18GHz
Determine the complex dielectric permittivity of electromagnetic parameter and the electromagnetic parameter of complex permeability.Test specimens preparation: by the way that product is dispersed in stone
In wax, accounting for total weight percent is 40%, is then pressed into annular element (outer diameter: 7.0 millimeters, 3.04 millimeters of internal diameter).
Embodiment 2:
In the present embodiment, product obtained is Fe3O4Nanoporous carbon nano-composite material.
Above-mentioned Fe3O4Nanoporous carbon nano-composite material the preparation method is as follows:
(1) terephthalic acid (TPA) of the ferric chloride hexahydrate of 311mg and 191mg are successively added to the N of 50ml, N- dimethyl methyl
In amide, stirring 30 minutes at 25 DEG C makes it sufficiently dissolve and be uniformly mixed.
(2) step (1) acquired solution is transferred in Teflon water heating kettle and is cooled to room temperature after 150 DEG C of heat preservation 12h, later
Precipitating after liquid is centrifuged.
(3) step (2) resulting product is first used n,N-Dimethylformamide liquid rinse 3 times, then clear with alcohol liquid
It washes 3 times.
(4) step (3) products therefrom is dried under vacuum.
(6) step (5) are made in powder nitrogen environment and are warming up to 700 DEG C with furnace and keep the temperature 5 minutes, last furnace cooling
To room temperature.
Product obtained above is detected, detection method is identical with embodiment 1 with detection content.
Comparative example:
The present embodiment is the comparative example of above-described embodiment 1,2.
In the present embodiment, product obtained is Fe Base Metal organic frame nanocomposite.
Above-mentioned Fe Base Metal organic frame nanocomposite the preparation method is as follows:
(1) terephthalic acid (TPA) of the ferric chloride hexahydrate of 155.5mg and 95.5mg are successively added to the N of 50ml, N- diformazan
In base formamide, stirring 30 minutes at 25 DEG C makes it sufficiently dissolve and be uniformly mixed；
(2) step (1) acquired solution is transferred in Teflon water heating kettle and is cooled to room temperature afterwards for 24 hours in 120 DEG C of heat preservations, later
Precipitating after liquid is centrifuged.
(3) step (2) resulting product is first used n,N-Dimethylformamide liquid rinse 3 times, then clear with alcohol liquid
It washes 3 times.
(4) step (3) products therefrom is dried under vacuum.
Product obtained above is detected, detection method is identical with embodiment 1 with detection content.
The object phase change of material obtained is as shown in Figure 1, its magnetic performance such as following table in embodiment 1,2 and comparative example
Shown in 1, as a result as shown in Figure 2.
Table 1: heat treatment process, magnetic property table in embodiment 1,2 and comparative example
Symbol meaning in table 1 is as follows:
Ms- saturation magnetization；Hc- coercivity, Mr——Remanent magnetization.
Embodiment 1,2 is with pattern under the projection Electronic Speculum of material obtained in comparative example as shown in figure 3, its specific surface area
Variation is as shown in Figure 4.
Embodiment 1,2 and the absorbing property of material obtained in comparative example are as shown in table 2 below, as a result such as Fig. 5.
Table 2: heat treatment process, absorbing property table in embodiment 1 and comparative example
Symbol meaning in table 2 is as follows:
RL-reflection loss；RLminThe loss of-minimal reflection.
Material phase analysis: as shown in Figure 1, Fe can be prepared by heat treatment2O3And Fe3O4Nano particle.Magnetic property analysis:
As shown in Fig. 2, products therefrom Fe Base Metal organic frame nanocomposite in comparative example, does not have typical magnetic hysteresis row
For this, which is primarily due to lack in its composition, has ferromagnetic ingredient；And product obtained in embodiment 1,2 have it is brighter
Aobvious hysteresis behavior, and the saturation magnetization of 2 products therefrom of embodiment is apparently higher than 1 products therefrom of embodiment, this is mainly
Since after Overheating Treatment, Fe in embodiment 23O4Nanoporous carbon magnetism content is than 1 products therefrom Fe of embodiment2O3Nanometer
Porous carbon is more.
Pattern and specific surface area mutation analysis: as shown in figure 3, comparative example is due to being not yet heat-treated, particle
Surface is more smooth compared with embodiment 1,2 and is hollow regular octahedron shape in inside；Embodiment 1 is obtained after Overheating Treatment
Product, particle surface obviously becomes coarse in SEM image, but its shape for generally still maintaining comparative example product is special
Sign.The product of embodiment 2, particle surface becomes more coarse in SEM image, and whole pattern still has comparative example
Shape characteristic.It is analyzed by TEM image, Fe2O3And Fe3O4Nano particle is evenly distributed on carbon frame in 50 rans
Above.As shown in Figure 4, with the progress of heat treatment, 2 products therefrom specific surface areas constantly contract from comparative example to embodiment
Caused by small, mainly being thermally decomposed by its organic matter leads to its particle collapse, and temperature raising oxide particle is grown up, but institute
The nanocomposite of preparation all has higher specific surface area, this is beneficial to the electromagnetic wave absorbability for improving composite material
Energy.
Absorbing property analysis: it can be seen that comparative example products therefrom Fe Base Metal organic frame from table 2 and Fig. 5 and receive
Nano composite material RL value within the scope of institute's measured frequency is all larger than -10dB, i.e., itself and do not have good absorbing property；Embodiment 1
Products therefrom Fe2O3Nanoporous carbon sample thickness range be 3-5mm, inhale wavestrip wide (RL < -10dB) be 7.2-7.6GHz and
12.8-13.3GHz, when frequency is 7.5GHz, and sample thickness is 4.0mm, RLminFor -27.6dB；2 products therefrom of embodiment
Fe3O4Nanoporous carbon particle sample thickness range is 3-5mm, and inhaling wavestrip wide (RL < -10dB) is 4.2-18GHz, in frequency
For 9.8GHz, when sample thickness is 3.0mm, RLminFor -65.7dB.It can be seen that 2 products therefrom of embodiment in C-Ku frequency band
Excellent absorbing property is shown in (4-18Ghz) range, there is very big application potential.
Embodiment 3
A kind of Fe3O4The preparation method of nanoporous carbon nano-composite material, using Fe-MOFs as template, to Fe-MOFs
It is heat-treated in nitrogen atmosphere, heat treatment temperature: 500 DEG C, soaking time: 120min, heating rate: heating rate: 1
DEG C/min, obtain Fe3O4Nanoporous carbon nano-composite material.
Wherein, Fe-MOFs be by ferric chloride hexahydrate and terephthalic acid (TPA) in n,N-Dimethylformamide hydro-thermal reaction
It is prepared.The ratio between amount of the ferric chloride hexahydrate, terephthalic acid (TPA), N,N-dimethylformamide substance=1:1:282；Water
Thermal rection condition are as follows: 100 DEG C of reaction temperature, soaking time 24 hours.
The Fe3O4Nanoporous carbon nano-composite material is as electromagnetic wave absorbent material application.
Embodiment 4
A kind of Fe3O4The preparation method of nanoporous carbon nano-composite material, using Fe-MOFs as template, to Fe-MOFs
It is heat-treated in argon atmosphere, heat treatment temperature: 700 DEG C, soaking time: 5min, heating rate: heating rate: 40 DEG C/
Min obtains Fe3O4Nanoporous carbon nano-composite material.
Wherein, Fe-MOFs be by ferric chloride hexahydrate and terephthalic acid (TPA) in n,N-Dimethylformamide hydro-thermal reaction
It is prepared.The ratio between amount of the ferric chloride hexahydrate, terephthalic acid (TPA), N,N-dimethylformamide substance=1:1:1130；
Hydrothermal reaction condition are as follows: 150 DEG C of reaction temperature, soaking time 2 hours.
The Fe3O4Nanoporous carbon nano-composite material is as electromagnetic wave absorbent material application.
Embodiment 5
A kind of Fe3O4The preparation method of nanoporous carbon nano-composite material, using Fe-MOFs as template, to Fe-MOFs
It is heat-treated in nitrogen atmosphere, heat treatment temperature: 600 DEG C, soaking time: 60min, heating rate: heating rate: 10
DEG C/min, obtain Fe3O4Nanoporous carbon nano-composite material.
Wherein, Fe-MOFs be by ferric chloride hexahydrate and terephthalic acid (TPA) in n,N-Dimethylformamide hydro-thermal reaction
It is prepared.The ratio between amount of the ferric chloride hexahydrate, terephthalic acid (TPA), N,N-dimethylformamide substance=1:1:500；Water
Thermal rection condition are as follows: 120 DEG C of reaction temperature, soaking time 12 hours.
The Fe3O4Nanoporous carbon nano-composite material is as electromagnetic wave absorbent material application.
Embodiment 6
A kind of Fe2O3The preparation method of nanoporous carbon nano-composite material, using Fe-MOFs as template, to Fe-MOFs
It is heat-treated in air, heat treatment temperature: 500-700 DEG C, soaking time: 300 DEG C, soaking time: 60min, heating speed
Rate: 1 DEG C/min, Fe is prepared2O3Nanoporous carbon nano-composite material.
Wherein, Fe-MOFs be by ferric chloride hexahydrate and terephthalic acid (TPA) in n,N-Dimethylformamide hydro-thermal reaction
It is prepared.The ratio between amount of the ferric chloride hexahydrate, terephthalic acid (TPA), N,N-dimethylformamide substance=1:1:282；Water
Thermal rection condition are as follows: 100 DEG C of reaction temperature, soaking time 24 hours.
The Fe2O3Nanoporous carbon nano-composite material is as electromagnetic wave absorbent material application.
Embodiment 7
A kind of Fe2O3The preparation method of nanoporous carbon nano-composite material, using Fe-MOFs as template, to Fe-MOFs
Be heat-treated in oxygen, heat treatment temperature: 500 DEG C, soaking time: heating rate: 60min 40 DEG C/min, is prepared
Fe2O3Nanoporous carbon nano-composite material.
Wherein, Fe-MOFs be by ferric chloride hexahydrate and terephthalic acid (TPA) in n,N-Dimethylformamide hydro-thermal reaction
It is prepared.The ratio between amount of the ferric chloride hexahydrate, terephthalic acid (TPA), N,N-dimethylformamide substance=1:1:1130；
Hydrothermal reaction condition are as follows: 150 DEG C of reaction temperature, soaking time hour.
The Fe2O3Nanoporous carbon nano-composite material is as electromagnetic wave absorbent material application.
Embodiment 8
A kind of Fe2O3The preparation method of nanoporous carbon nano-composite material, using Fe-MOFs as template, to Fe-MOFs
Be heat-treated in air, heat treatment temperature: 400 DEG C, soaking time: heating rate: 30min 20 DEG C/min, is prepared
Fe2O3Nanoporous carbon nano-composite material.
Wherein, Fe-MOFs be by ferric chloride hexahydrate and terephthalic acid (TPA) in n,N-Dimethylformamide hydro-thermal reaction
It is prepared.The ratio between amount of the ferric chloride hexahydrate, terephthalic acid (TPA), N,N-dimethylformamide substance=1:1:730；Water
Thermal rection condition are as follows: 120 DEG C of reaction temperature, soaking time 16 hours.
The Fe2O3Nanoporous carbon nano-composite material is as electromagnetic wave absorbent material application.
In conclusion the excellent Fe of absorbing property can be prepared by simply chemically reacting and being heat-treated3O4Nanometer
Porous carbon nano-composite material.Especially the technological parameter can effectively regulate and control Fe3O4Nanoporous carbon composite particle ruler
Very little, its performance of final regulation and control, to advance industrialized production significantly, the extensive use and development for absorbing material have weight
The meaning wanted.
The above description of the embodiments is intended to facilitate ordinary skill in the art to understand and use the invention.
Person skilled in the art obviously easily can make various modifications to these embodiments, and described herein general
Principle is applied in other embodiments without having to go through creative labor.Therefore, the present invention is not limited to the above embodiments, ability
Field technique personnel announcement according to the present invention, improvement and modification made without departing from the scope of the present invention all should be of the invention
Within protection scope.
Claims (10)
1. a kind of FeaObThe preparation method of nanoporous carbon nano-composite material, which is characterized in that using Fe-MOFs as template,
Fe-MOFs is heat-treated, Fe is obtainedaObNanoporous carbon nano-composite material.
2. Fe according to claim 1aObThe preparation method of nanoporous carbon nano-composite material, which is characterized in that wherein a
=3, b=4, the FeaObNanoporous carbon nano-composite material is Fe3O4Nanoporous carbon nano-composite material, is prepared into
To Fe3O4The heat treatment condition of nanoporous carbon nano-composite material are as follows: heat treatment temperature: 500-700 DEG C, soaking time: 5-
120min, heating rate: heating rate: 1-40 DEG C/min.
3. Fe according to claim 2aObThe preparation method of nanoporous carbon nano-composite material, which is characterized in that at heat
Reason is carried out in nitrogen or argon atmosphere.
4. Fe according to claim 1aObThe preparation method of nanoporous carbon nano-composite material, which is characterized in that wherein a
=2, b=3, the FeaObNanoporous carbon nano-composite material is Fe2O3Nanoporous carbon nano-composite material, is prepared into
To Fe2O3The heat treatment condition of nanoporous carbon nano-composite material are as follows: heat treatment temperature: 300-500 DEG C, soaking time: 10-
60min, heating rate: 1-40 DEG C/min.
5. Fe according to claim 4aObThe preparation method of nanoporous carbon nano-composite material, which is characterized in that at heat
Reason is to carry out in air or in oxygen.
6. Fe described in any one of -5 according to claim 1aObThe preparation method of nanoporous carbon nano-composite material, feature
It is, the Fe-MOFs is that in n,N-Dimethylformamide prepared by hydro-thermal reaction by ferric chloride hexahydrate and terephthalic acid (TPA)
It obtains.
7. Fe according to claim 6aObThe preparation method of nanoporous carbon nano-composite material, which is characterized in that described
The ratio between amount of ferric chloride hexahydrate, terephthalic acid (TPA), N,N-dimethylformamide substance=1:1:(282-1130)；
Hydrothermal reaction condition are as follows: 100-150 DEG C of reaction temperature, soaking time 2-24 hours.
8. a kind of Fe of the preparation of the preparation method as described in Claims 2 or 33O4Nanoporous carbon nano-composite material.
9. a kind of Fe by the preparation method preparation of claim 4 or 52O3Nanoporous carbon nano-composite material.
10. Fe described in claim 83O4Fe described in nanoporous carbon nano-composite material or claim 92O3Nanoporous carbon
Application of the nanocomposite as electromagnetic wave absorbent material.
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