CN109494038B - Ferroferric oxide-nano porous carbon nano composite material and preparation method and application thereof - Google Patents
Ferroferric oxide-nano porous carbon nano composite material and preparation method and application thereof Download PDFInfo
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Abstract
The invention relates to a ferroferric oxide-nano porous carbon nano composite material and a preparation method and application thereof. The method utilizes the Fe-based metal organic framework material as a template to finally obtain Fe by regulating and controlling thermal decomposition parameters3O4-nanoporous carbon nanocomposites. Experiments prove that the preparation method of the nano composite material has the characteristics of stability, controllability, simplicity and easiness in operation, and the material has excellent electromagnetic wave absorption capacity. Therefore, the invention provides a novel idea for the design and synthesis of the electromagnetic wave absorption material for industrial production.
Description
Technical Field
The invention relates to an electromagnetic wave absorbing material in the field of functional materials, in particular to Fe3O4-nano porous carbon nano composite material and its preparation method and application.
Background
Nowadays, with the rapid development of radar technology, electronic equipment and wireless communication technology, electromagnetic radiation and interference become more and more serious in daily life, which not only threatens human health, but also interferes electromagnetic equipment, and brings problems to the application of the electromagnetic equipment in the military field. In order to solve these serious problems, efforts have been made to develop efficient electromagnetic wave absorbing materials having strong absorption capacity, wide absorption bandwidth, light weight, and thin matching thickness for the past several decades. Generally, electromagnetic wave absorbing materials can be classified into two broad categories, namely dielectric materials and magnetic materials, according to the loss characteristics of electromagnetic waves. As is well known, carbon materials, magnetic metals, and ferrite materials are widely used for manufacturing electromagnetic wave absorbing materials.
In the magnetic material, Fe3O4Nanoparticles are of great interest for their low cost, chemical stability, environmental protection, and high adsorption performance. Albeit with respect to Fe3O4A great deal of work reports of the wave-absorbing material, but various problems of narrow absorption bandwidth, large thickness, large density and the like of the magnetic material limit the practical application of the magnetic material in the field of electromagnetic wave absorption. On the other hand, carbon materials such asCarbon fibers and the like have the advantages of high hardness, small density, light weight, wide absorption bandwidth and the like, but impedance mismatch caused by relatively high complex dielectric constant and poor magnetic permeability severely limits the application of the carbon materials in the field of electromagnetic wave absorption. Therefore, it is difficult to achieve high electromagnetic wave absorption performance for a single dielectric material or magnetic material. In order to overcome the above disadvantages, an effective method is to elaborate a composite material of a magnetic material and a dielectric material so as to utilize the synergistic effect between the two. E.g. Fe3O4With TiO2Of complex, Fe3O4Compounding with carbon nanotubes, compounding NiZn ferrite with graphene, and the like. Although the magnetic material is compounded with the carbon material, the electromagnetic wave absorption performance is substantially improved. However, there is still a difficulty in how to prepare a high-performance electromagnetic wave absorbing material by simple structure and optimization of components.
Disclosure of Invention
The present invention aims to overcome the defects of the prior art and provide Fe3O4-nano porous carbon nano composite material and its preparation method and application. The nano composite material has excellent electromagnetic wave absorption performance, and excellent and stable electromagnetic wave absorption performance can be obtained through simple chemical reaction and heat treatment process.
The purpose of the invention can be realized by the following technical scheme:
the invention provides FeaObThe preparation method of the-nano porous carbon nano composite material comprises the steps of taking Fe-MOFs as a template, and carrying out heat treatment on the Fe-MOFs to obtain FeaOb-nanoporous carbon nanocomposites.
Wherein a is 3, b is 4, and FeaOb-the nanoporous carbon nanocomposite is Fe3O4-nanoporous carbon nanocomposite, preparation of Fe3O4-the conditions of the thermal treatment of the nanoporous carbon nanocomposite are: the heat treatment temperature is as follows: 500 ℃ and 700 ℃, and the heat preservation time: 5-120min, heating rate: the heating rate is as follows: 1-40 deg.C/min.
Further, the heat treatment is performed in a nitrogen or argon atmosphere.
Wherein a is 2, b is 3, and FeaOb-the nanoporous carbon nanocomposite is Fe2O3-nanoporous carbon nanocomposite, preparation of Fe2O3-the conditions of the thermal treatment of the nanoporous carbon nanocomposite are: the heat treatment temperature is as follows: 300 ℃ and 500 ℃, and the heat preservation time is as follows: 10-60min, heating rate: 1-40 deg.C/min.
Further, the heat treatment is carried out in air or oxygen.
Further, the Fe-MOFs is prepared by carrying out hydrothermal reaction on ferric chloride hexahydrate and terephthalic acid in N, N-dimethylformamide.
Further, the ratio of the amounts of ferric chloride hexahydrate, terephthalic acid, N-dimethylformamide species is 1: 1: (282-);
the hydrothermal reaction conditions are as follows: the reaction temperature is 100 ℃ and 150 ℃, and the heat preservation time is 2-24 hours.
The invention also comprises Fe prepared by the preparation method3O4-nanoporous carbon nanocomposites.
The invention also comprises Fe prepared by the preparation method2O3-nanoporous carbon nanocomposites.
The invention also includes said Fe3O4-nanoporous carbon nanocomposite or said Fe2O3-the use of nanoporous carbon nanocomposites as electromagnetic wave absorbing materials.
By metal-organic framework materials is meant a class of materials consisting of metals (clusters) and ligands with high surface area and effective porosity, which are considered ideal candidates for fuel storage, gas adsorption and catalytic applications. More importantly, the MOFs material (Metal organic Framework compound, English name Metal organic Framework) has a plurality of nanopores and open pore channels on the structure, and is an ideal template material for preparing the nanoporous carbon material. In the invention, the Fe-based metal organic framework nano material is an MOFs material.
The invention can obtain the metal or metal oxide nanoparticle composite material uniformly dispersed in the porous carbon matrix by properly controlling the thermal decomposition conditions of the MOFs.
Therefore, the invention adopts a simple and easy preparation method which takes Fe-based metal-organic framework material as a template to prepare Fe with high wave absorption performance3O4-nanoporous carbon nanocomposites.
The invention realizes the preparation of Fe through chemical synthesis and heat treatment3O4-nanoporous carbon nanocomposite materials, with the advantage of excellent comprehensive electromagnetic wave absorption. Especially, the preparation process is simple, feasible, controllable and stable, thereby greatly promoting the industrial production and being used for Fe3O4The wide application and development of the nano porous carbon nano composite material have important significance.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. the Fe-based metal organic framework nano material is prepared by chemical synthesis.
2. Preparation of Fe3O4-nanoporous carbon nanocomposite with excellent overall electromagnetic wave absorption, RLminIs-65.7 dB, and the wave-absorbing bandwidth (RL)<-10dB) is 4.2-18 GHz.
3. The preparation process is simple, feasible, controllable and stable, so that the industrial production is greatly promoted, and the method is used for treating Fe3O4The wide application and development of the nano porous carbon nano composite material have important significance.
Drawings
FIG. 1 example 1 (Fe)2O3@ NPC), example 2 (Fe)3O4@ NPC).
FIG. 2 example 1 (Fe)2O3@ NPC), example 2 (Fe)3O4@ NPC) and comparative examples (Fe-MOFs).
FIG. 3 shows comparative example (Fe-MOFs), example 1 (Fe-MOFs) from top to bottom2O3@ NPC) with example 2 (Fe)3O4@ NPC) SEM (left) and TEM (right) images.
FIG. 4 comparisonExamples (Fe-MOFs), example 1 (Fe)2O3@ NPC) with example 2 (Fe)3O4@ NPC).
FIG. 5-1 shows the wave-absorbing properties of comparative examples (Fe-MOFs).
FIGS. 5-2 example 1 (Fe)2O3@ NPC).
FIGS. 5-3 example 2 (Fe)3O4@ NPC).
In fig. 5-1, 5-2, and 5-3, the lines corresponding to 0.5, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, and 5.0 refer to the lines from top to bottom in the image in the figure.
Detailed Description
The invention will be described in further detail below with reference to the embodiments of the drawing, which are intended to facilitate the understanding of the invention and are not intended to limit the invention in any way.
The invention provides the following specific embodiments, discloses the performance of various combination examples, and analyzes the effect of each experimental parameter in the system. Therefore, this patent specification should be considered to disclose all possible combinations of the described technical solutions.
Example 1:
in this example, the product obtained was Fe2O3-nanoporous carbon nanocomposites.
Fe as described above2O3The preparation method of the nanoporous carbon nanocomposite material comprises the following steps:
(1) 622mg of ferric chloride hexahydrate and 382mg of terephthalic acid were added to 50ml of N, N-dimethylformamide, followed by stirring at 25 ℃ for 30 minutes to be sufficiently dissolved and mixed uniformly.
(2) And (2) transferring the solution obtained in the step (1) into a Teflon hydrothermal kettle, preserving the heat at 100 ℃ for 24 hours, cooling to room temperature, and centrifuging the liquid to obtain a centrifuged precipitate.
(3) And (3) washing the product obtained in the step (2) by using N, N-dimethylformamide liquid for 3 times, and then washing by using alcohol liquid for 3 times.
(4) And (4) drying the product obtained in the step (3) under vacuum.
(5) And (4) heating the powder prepared in the step (4) to 300 ℃ along with the furnace in an air environment, preserving the temperature for 30 minutes, and cooling to room temperature along with the furnace.
The product obtained above was tested as follows:
(A) the magnetic properties of the product were obtained by a physical property measurement system (manufactured by quantum design, ltd.).
(B) The appearance of the sample was observed by a scanning electron microscope (SEM, the same below), a Transmission Electron Microscope (TEM), and a high-resolution transmission electron microscope (HRTEM, the same below), respectively.
(C) Respectively adopting irradiation source as Cu-KaTo determine the crystal structure of the sample by x-ray diffraction (abbreviated as XRD, the same applies hereinafter).
(D) And respectively adopting a 532nm laser low-temperature matrix separation Raman spectrum system to analyze the Raman spectrum of the sample.
(E) The nitrogen adsorption-release curves of the samples were recorded by a Quad-rasorb-SI instrument, and the specific surface areas of the samples were measured by the Brunauer-Emmett-Teller (BET) method
(F) The complex permittivity and complex permeability of the electromagnetic parameters were determined by means of the coaxial line method by means of an Agilent N5224A vector network analyzer in the frequency range of 2-18 GHz. Preparation of a test sample: the product was prepared by uniformly dispersing it in paraffin wax, which was 40% by weight, and then pressing into a ring-shaped article (outer diameter: 7.0 mm, inner diameter: 3.04 mm).
Example 2:
in this example, the product obtained was Fe3O4-nanoporous carbon nanocomposites.
Fe as described above3O4The preparation method of the nanoporous carbon nanocomposite material comprises the following steps:
(1) 311mg of ferric chloride hexahydrate and 191mg of terephthalic acid were added to 50ml of N, N-dimethylformamide successively, and stirred at 25 ℃ for 30 minutes to be sufficiently dissolved and mixed uniformly.
(2) And (2) transferring the solution obtained in the step (1) into a Teflon hydrothermal kettle, preserving the heat at 150 ℃ for 12h, cooling to room temperature, and centrifuging the liquid to obtain a centrifuged precipitate.
(3) And (3) washing the product obtained in the step (2) by using N, N-dimethylformamide liquid for 3 times, and then washing by using alcohol liquid for 3 times.
(4) And (4) drying the product obtained in the step (3) under vacuum.
(5) And (4) heating the powder prepared in the step (4) to 700 ℃ along with the furnace in a nitrogen environment, preserving the temperature for 5 minutes, and finally cooling to room temperature along with the furnace.
The product prepared in the above way is tested, and the testing method and the testing content are completely the same as those in the embodiment 1.
Comparative example:
this example is a comparative example to examples 1,2 above.
In this example, the prepared product was a Fe-based metal organic framework nanocomposite.
The preparation method of the Fe-based metal organic framework nanocomposite material comprises the following steps:
(1) adding 155.5mg of ferric chloride hexahydrate and 95.5mg of terephthalic acid into 50ml of N, N-dimethylformamide sequentially, stirring for 30 minutes at 25 ℃ to fully dissolve the ferric chloride hexahydrate and the terephthalic acid and uniformly mixing;
(2) and (2) transferring the solution obtained in the step (1) into a Teflon hydrothermal kettle, preserving the temperature at 120 ℃ for 24h, cooling to room temperature, and centrifuging the liquid to obtain a centrifuged precipitate.
(3) And (3) washing the product obtained in the step (2) by using N, N-dimethylformamide liquid for 3 times, and then washing by using alcohol liquid for 3 times.
(4) And (4) drying the product obtained in the step (3) under vacuum.
The product prepared in the above way is tested, and the testing method and the testing content are completely the same as those in the embodiment 1.
The phase change of the materials prepared in examples 1 and 2 and comparative example is shown in fig. 1, and the magnetic properties thereof are shown in table 1 below, and the results are shown in fig. 2.
Table 1: heat treatment Process and magnetic Property Table in examples 1 and 2 and comparative example
The symbols in table 1 have the following meanings: ms-saturation magnetization; hcCoercive force, Mr-residual magnetization.
The shapes of the materials prepared in examples 1 and 2 and comparative example under a transmission electron microscope are shown in FIG. 3, and the changes of the specific surface area are shown in FIG. 4.
The wave absorption properties of the materials prepared in examples 1 and 2 and comparative example are shown in table 2 below, and the results are shown in fig. 5.
Table 2: heat treatment process and wave absorbing performance table in example 1 and comparative example
The symbols in table 2 have the following meanings:
RL — reflection loss; RLminMinimum reflection losses.
Phase analysis: as shown in FIG. 1, Fe can be prepared by heat treatment2O3And Fe3O4And (3) nanoparticles. And (3) magnetic property analysis: as shown in fig. 2, the Fe-based metal-organic framework nanocomposite obtained in the comparative example has no typical hysteresis behavior, mainly due to the absence of ferromagnetic components in its composition; the products obtained in examples 1 and 2 have relatively obvious hysteresis behavior, and the saturation magnetization of the product obtained in example 2 is obviously higher than that of the product obtained in example 1, mainly because the Fe in example 2 is subjected to heat treatment3O4Nanoporous carbon magnetic content Fe compared to the product obtained in example 12O3Nanoporous carbon poly.
And (3) analyzing the change of the morphology and the specific surface area: as shown in FIG. 3, the comparative example has a more flat particle surface than examples 1 and 2 and has a regular octahedral shape with a hollow interior because the comparative example has not been heat-treated; after heat treatment, the product of example 1 is obtained, the particle surface of which is shown in the SEM imageThe face was noticeably roughened but it still substantially retained the shape characteristics of the product of the comparative example. The product of example 2, in which the surface of the particles in the SEM image became rougher, still had the morphology characteristics of the comparative example in its overall morphology. By TEM image analysis, Fe thereof2O3And Fe3O4The nano particles are about 50 nanometers and are uniformly distributed on the carbon framework. As shown in fig. 4, as the heat treatment is performed, the specific surface area of the product obtained from the comparative example to example 2 is gradually reduced, mainly caused by the particle collapse due to the thermal decomposition of the organic substance and the growth of the oxide particles due to the increase of the temperature, but the prepared nano composite material has a higher specific surface area, which is beneficial to improving the electromagnetic wave absorption performance of the composite material.
Wave-absorbing performance analysis: as can be seen from Table 2 and FIG. 5, the RL values of the Fe-based metal-organic framework nanocomposite obtained in the comparative example are all greater than-10 dB in the measured frequency range, i.e. the Fe-based metal-organic framework nanocomposite does not have good wave-absorbing performance; fe product of example 12O3The thickness range of the nano porous carbon sample is 3-5mm, and the wave-absorbing bandwidth (RL) of the nano porous carbon sample<-10dB) of 7.2-7.6GHz and 12.8-13.3GHz, RL at a frequency of 7.5GHz and a specimen thickness of 4.0mmminIs-27.6 dB; example 2 product Fe3O4The thickness range of the nano porous carbon particle sample is 3-5mm, and the wave-absorbing bandwidth (RL) of the nano porous carbon particle sample<-10dB) of 4.2 to 18GHz, RL at a frequency of 9.8GHz and a specimen thickness of 3.0mmminIs-65.7 dB. Therefore, the product obtained in example 2 shows excellent wave absorbing performance in the range of C-Ku frequency band (4-18Ghz), and has great application potential.
Example 3
Fe3O4The preparation method of the nanoporous carbon nanocomposite comprises the following steps of taking Fe-MOFs as a template, and carrying out heat treatment on the Fe-MOFs in a nitrogen atmosphere, wherein the heat treatment temperature is as follows: 500 ℃, heat preservation time: 120min, heating rate: the heating rate is as follows: 1 ℃/min to obtain Fe3O4-nanoporous carbon nanocomposites.
Wherein, the Fe-MOFs is prepared by carrying out hydrothermal reaction on ferric chloride hexahydrate and terephthalic acid in N, N-dimethylformamide. The mass ratio of ferric chloride hexahydrate, terephthalic acid and N, N-dimethylformamide is 1: 1: 282; the hydrothermal reaction conditions are as follows: the reaction temperature is 100 ℃, and the holding time is 24 hours.
Said Fe3O4-the nanoporous carbon nanocomposite is applied as an electromagnetic wave absorbing material.
Example 4
Fe3O4The preparation method of the nanoporous carbon nanocomposite comprises the following steps of taking Fe-MOFs as a template, and carrying out heat treatment on the Fe-MOFs in an argon atmosphere, wherein the heat treatment temperature is as follows: 700 ℃, heat preservation time: 5min, heating rate: the heating rate is as follows: at 40 ℃/min, Fe is obtained3O4-nanoporous carbon nanocomposites.
Wherein, the Fe-MOFs is prepared by carrying out hydrothermal reaction on ferric chloride hexahydrate and terephthalic acid in N, N-dimethylformamide. The mass ratio of ferric chloride hexahydrate, terephthalic acid and N, N-dimethylformamide is 1: 1: 1130; the hydrothermal reaction conditions are as follows: the reaction temperature is 150 ℃, and the holding time is 2 hours.
Said Fe3O4-the nanoporous carbon nanocomposite is applied as an electromagnetic wave absorbing material.
Example 5
Fe3O4The preparation method of the nanoporous carbon nanocomposite comprises the following steps of taking Fe-MOFs as a template, and carrying out heat treatment on the Fe-MOFs in a nitrogen atmosphere, wherein the heat treatment temperature is as follows: and (3) keeping the temperature at 600 ℃ for a period of time: 60min, heating rate: the heating rate is as follows: 10 ℃/min to obtain Fe3O4-nanoporous carbon nanocomposites.
Wherein, the Fe-MOFs is prepared by carrying out hydrothermal reaction on ferric chloride hexahydrate and terephthalic acid in N, N-dimethylformamide. The mass ratio of ferric chloride hexahydrate, terephthalic acid and N, N-dimethylformamide is 1: 1: 500, a step of; the hydrothermal reaction conditions are as follows: the reaction temperature is 120 ℃, and the holding time is 12 hours.
Said Fe3O4-nanoporous carbon nanocomposites as electromagnetic wave absorbersAnd (5) receiving materials for application.
Example 6
Fe2O3The preparation method of the nanoporous carbon nanocomposite comprises the following steps of taking Fe-MOFs as a template, and carrying out heat treatment on the Fe-MOFs in air, wherein the heat treatment temperature is as follows: 300 ℃, heat preservation time: 60min, heating rate: 1 ℃/min to prepare Fe2O3-nanoporous carbon nanocomposites.
Wherein, the Fe-MOFs is prepared by carrying out hydrothermal reaction on ferric chloride hexahydrate and terephthalic acid in N, N-dimethylformamide. The mass ratio of ferric chloride hexahydrate, terephthalic acid and N, N-dimethylformamide is 1: 1: 282; the hydrothermal reaction conditions are as follows: the reaction temperature is 100 ℃, and the holding time is 24 hours.
Said Fe2O3-the nanoporous carbon nanocomposite is applied as an electromagnetic wave absorbing material.
Example 7
Fe2O3The preparation method of the nanoporous carbon nanocomposite comprises the following steps of taking Fe-MOFs as a template, and carrying out heat treatment on the Fe-MOFs in oxygen, wherein the heat treatment temperature is as follows: 500 ℃, heat preservation time: 60min, heating rate: preparing Fe at 40 ℃/min2O3-nanoporous carbon nanocomposites.
Wherein, the Fe-MOFs is prepared by carrying out hydrothermal reaction on ferric chloride hexahydrate and terephthalic acid in N, N-dimethylformamide. The mass ratio of ferric chloride hexahydrate, terephthalic acid and N, N-dimethylformamide is 1: 1: 1130; the hydrothermal reaction conditions are as follows: the reaction temperature is 150 ℃, and the holding time is hours.
Said Fe2O3-the nanoporous carbon nanocomposite is applied as an electromagnetic wave absorbing material.
Example 8
Fe2O3The preparation method of the nanoporous carbon nanocomposite comprises the following steps of taking Fe-MOFs as a template, and carrying out heat treatment on the Fe-MOFs in air, wherein the heat treatment temperature is as follows: 400 ℃, heat preservation time: 30min, heating rate: preparing Fe at 20 ℃/min2O3-nanoporous carbon nanocomposites.
Wherein, the Fe-MOFs is prepared by carrying out hydrothermal reaction on ferric chloride hexahydrate and terephthalic acid in N, N-dimethylformamide. The mass ratio of ferric chloride hexahydrate, terephthalic acid and N, N-dimethylformamide is 1: 1: 730; the hydrothermal reaction conditions are as follows: the reaction temperature is 120 ℃, and the holding time is 16 hours.
Said Fe2O3-the nanoporous carbon nanocomposite is applied as an electromagnetic wave absorbing material.
In conclusion, Fe with excellent wave-absorbing performance can be prepared through simple chemical reaction and heat treatment3O4-nanoporous carbon nanocomposites. Especially, the process parameters can effectively regulate and control Fe3O4The particle size of the nano porous carbon composite material is finally regulated, so that the industrial production is greatly promoted, and the nano porous carbon composite material has important significance for the wide application and development of the wave-absorbing material.
The embodiments described above are described to facilitate an understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.
Claims (10)
1. FeaObThe preparation method of the nano porous carbon nano composite material is characterized in that Fe-MOFs is used as a template to carry out heat treatment on the Fe-MOFs to obtain FeaOb-a nanoporous carbon nanocomposite;
wherein a is 3, b is 4, and FeaOb-the nanoporous carbon nanocomposite is Fe3O4-nanoporous carbon nanocomposite, preparation of Fe3O4Thermal treatment conditions of nanoporous carbon nanocompositesComprises the following steps: the heat treatment temperature is as follows: 500 ℃ and 700 ℃, and the heat preservation time: 5-120min, heating rate: the heating rate is as follows: 1-40 deg.C/min, and the heat treatment is performed in nitrogen or argon atmosphere.
2. Fe according to claim 1aObThe preparation method of the nano porous carbon nano composite material is characterized in that the Fe-MOFs is prepared by carrying out hydrothermal reaction on ferric chloride hexahydrate and terephthalic acid in N, N-dimethylformamide.
3. Fe according to claim 2aOb-a process for the preparation of nanoporous carbon nanocomposites, characterized in that the ratio of the amounts of ferric chloride hexahydrate, terephthalic acid, N-dimethylformamide species is 1: 1: (282-);
the hydrothermal reaction conditions are as follows: the reaction temperature is 100 ℃ and 150 ℃, and the heat preservation time is 2-24 hours.
4. FeaObThe preparation method of the nano porous carbon nano composite material is characterized in that Fe-MOFs is used as a template to carry out heat treatment on the Fe-MOFs to obtain FeaOb-a nanoporous carbon nanocomposite;
wherein a is 2, b is 3, and FeaOb-the nanoporous carbon nanocomposite is Fe2O3-nanoporous carbon nanocomposite, preparation of Fe2O3-the conditions of the thermal treatment of the nanoporous carbon nanocomposite are: the heat treatment temperature is as follows: 300 ℃ and 500 ℃, and the heat preservation time is as follows: 30-60min, heating rate: 1-40 deg.C/min, and the heat treatment is carried out in air or oxygen.
5. Fe according to claim 4aObThe preparation method of the nano porous carbon nano composite material is characterized in that the Fe-MOFs is prepared by carrying out hydrothermal reaction on ferric chloride hexahydrate and terephthalic acid in N, N-dimethylformamide.
6. Root of herbaceous plantFe according to claim 5aOb-a process for the preparation of nanoporous carbon nanocomposites, characterized in that the ratio of the amounts of ferric chloride hexahydrate, terephthalic acid, N-dimethylformamide species is 1: 1: (282-);
the hydrothermal reaction conditions are as follows: the reaction temperature is 100 ℃ and 150 ℃, and the heat preservation time is 2-24 hours.
7. Fe prepared by the method of claim 13O4-nanoporous carbon nanocomposites.
8. Fe as recited in claim 73O4-the use of nanoporous carbon nanocomposites as electromagnetic wave absorbing materials.
9. Fe prepared by the method of claim 42O3-nanoporous carbon nanocomposites.
10. Fe as recited in claim 92O3-the use of nanoporous carbon nanocomposites as electromagnetic wave absorbing materials.
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| CN108154984A (en) * | 2017-12-26 | 2018-06-12 | 山东大学 | A kind of porous ferroferric oxide/carbon nano rod shape electromagnetic wave absorbent material and preparation method and application |
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