CN113068385A - One-dimensional yolk-shell Ni @ void @ Co3O4@ RGO wave absorbing agent and preparation method thereof - Google Patents

One-dimensional yolk-shell Ni @ void @ Co3O4@ RGO wave absorbing agent and preparation method thereof Download PDF

Info

Publication number
CN113068385A
CN113068385A CN202110281143.4A CN202110281143A CN113068385A CN 113068385 A CN113068385 A CN 113068385A CN 202110281143 A CN202110281143 A CN 202110281143A CN 113068385 A CN113068385 A CN 113068385A
Authority
CN
China
Prior art keywords
void
dimensional
nanowire
rgo
nanowires
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202110281143.4A
Other languages
Chinese (zh)
Inventor
马明亮
童周禹
刘燕燕
毕宇欣
王荣珍
陈燕
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Qingdao University of Technology
Original Assignee
Qingdao University of Technology
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Qingdao University of Technology filed Critical Qingdao University of Technology
Priority to CN202110281143.4A priority Critical patent/CN113068385A/en
Publication of CN113068385A publication Critical patent/CN113068385A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K9/00—Screening of apparatus or components against electric or magnetic fields
    • H05K9/0073—Shielding materials
    • H05K9/0081—Electromagnetic shielding materials, e.g. EMI, RFI shielding
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K9/00—Screening of apparatus or components against electric or magnetic fields
    • H05K9/0073—Shielding materials
    • H05K9/0081—Electromagnetic shielding materials, e.g. EMI, RFI shielding
    • H05K9/0086—Electromagnetic shielding materials, e.g. EMI, RFI shielding comprising a single discontinuous metallic layer on an electrically insulating supporting structure, e.g. metal grid, perforated metal foil, film, aggregated flakes, sintering

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Carbon And Carbon Compounds (AREA)
  • Manufacture Of Metal Powder And Suspensions Thereof (AREA)

Abstract

The invention belongs to the technical field of wave absorbers and discloses a one-dimensional yolk-shell Ni @ void @ Co3O4@ RGO wave absorbing agent, preparation method and application thereof, preparation of one-dimensional Ni nanowire, preparation of one-dimensional Ni @ phenolic aldehyde (Ni @ RF) nanowire, Ni @ void @ Co3O4Preparing a nanowire; preparing one-dimensional Ni nanowires by a chemical reduction method, and coating the one-dimensional Ni nanowires with a phenolic resin layer and Co (OH)2Nano-sheet layer and calcining in air to obtain one-dimensional Ni @ void @ Co3O4The nanowire is compounded with the reduced graphene to obtain the final composite wave absorbing agent, and the composite wave absorbing agent is novel in structure and excellent in performance. The wave absorbing agent prepared by the invention has excellent performance and good application prospect. Ni @ void @ Co in a hierarchical structure3O4Of the nanowires, the internal magnetic Ni nanowires are dedicated to generate active magnetic loss, while flower-like Co3O4Nanoplates and RGO nanoplates support dielectric loss.

Description

One-dimensional yolk-shell Ni @ void @ Co3O4@ RGO wave absorbing agent and preparation method thereof
Technical Field
The invention belongs to a suckerThe technical field of wave agent, in particular to a one-dimensional yolk-shell Ni @ void @ Co3O4A @ RGO wave absorbing agent, a preparation method and application.
Background
At present, microwave technologies such as wireless communication equipment bring great convenience to human beings and also bring some problems of electromagnetic pollution. Electromagnetic pollution poses a threat to human health, can also cause the use of electronic equipment, and is a new environmental pollution. Therefore, it is of great significance to develop a material capable of effectively absorbing electromagnetic waves.
The wave absorbing agent with a single component has poor performance and cannot meet the requirements of thinness, lightness, width and strength of an ideal wave absorbing material, so that the composite wave absorbing agent with combined action of multiple loss mechanisms is the mainstream of research. The one-dimensional magnetic wave-absorbing material not only has the quantum size effect and the macroscopic quantum tunneling effect of common nano particles, but also has strong shape anisotropy, so that the limitation of isotropic powder materials in the aspect of electromagnetic property can be broken through, and the wave-absorbing property can be improved. In addition, the good magnetism not only facilitates the sample separation in the preparation process, but also can increase the magnetic loss effect in the wave absorbing process. Yolk-shell (yolk-shell) structure has also gained wide attention as a novel core-shell structure, because the existence of many space gaps in the structure aggravates the multiple reflection and scattering behavior of incident electromagnetic waves, improves impedance matching, and helps to reduce the weight of the material. However, at present, the one-dimensional structure and the yolk-shell structure are still difficult points in structural design and preparation, and relatively few reports are reported in the literature.
Through the above analysis, the problems and defects of the prior art are as follows: at present, a one-dimensional structure and a yolk-shell structure are still difficult points in structure design and preparation, and relatively few reports are reported in documents.
The difficulty in solving the above problems and defects is: the one-dimensional structure is difficult to regulate and control due to the length-diameter ratio and the complex preparation method, and is still a difficult point in structural design and preparation, and relatively few reports are reported in documents. The preparation of the yolk-shell structure is difficult, and the preparation method is single, so the design of the one-dimensional yolk-shell structure is more difficult.
The significance of solving the problems and the defects is as follows: the Ni nanowire is used as a matrix, the phenolic resin layer is used as a sacrificial template, a one-dimensional yolk-shell structure with simple steps and low cost is designed, a novel high-performance wave absorbing agent is obtained, and a new thought and a technical support are provided for the preparation of the structure in the future.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a one-dimensional yolk-shell Ni @ void @ Co3O4A @ RGO wave absorbing agent, a preparation method and application.
The invention is realized in such a way that one-dimensional yolk-shell Ni @ void @ Co3O4The preparation method of the @ RGO wave absorbing agent is that the one-dimensional yolk-shell Ni @ void @ Co3O4The preparation method of the @ RGO wave absorbing agent comprises the following steps:
with NiCl2·6H2O is a nickel source, N2H4·H2O is a reducing agent, and the Ni nanowire is synthesized by a chemical reduction method;
coating a phenolic resin RF layer on the outer side of the Ni nanowire through in-situ polymerization reaction of resorcinol and formaldehyde to obtain a one-dimensional Ni @ RF nanowire;
growing Co (OH) on the surface of the Ni @ RF nanowire by an oil bath reflux method2Nanosheets, then annealed to Co in air3O4Nanosheets; the coating phenolic resin RF reacts with air to be removed, and Ni @ void @ Co with flower-shaped surface yolk-shell structure is obtained3O4A nanowire;
uniformly mixing the nanowire and the graphene suspension, and carrying out hydrothermal reaction to prepare Ni @ void @ Co3O4the/RGO composite material.
Further, the one-dimensional yolk-shell Ni @ void @ Co3O4The preparation method of the @ RGO wave absorbing agent comprises the following steps:
step one, preparing a one-dimensional Ni nanowire: dissolving NaOH in ethylene glycol, adding a reducing agent hydrazine hydrate solution after stirring, and continuously stirring to obtain a mixed solution; placing the mixed solution in a constant temperature water bath with an external magnetic field, and injecting the mixed solution into a syringeWherein NiCl is slowly dripped2·6H2O ethylene glycol solution; after standing, collecting the Ni nanowires by using a magnet, washing the Ni nanowires for three times by using absolute ethyl alcohol and deionized water, and finally freeze-drying;
step two, preparing the one-dimensional Ni @ RF nanowire: under ultrasonic treatment, dispersing Ni nanowires in a mixed solution of deionized water and absolute ethyl alcohol, and then adding CTAB, ammonia water and resorcinol; mechanically stirring the mixed solution, injecting a formaldehyde solution by using an injector, and keeping mechanical stirring; and after the reaction is finished, separating the precipitate by using a magnet, washing the precipitate for three times by using absolute ethyl alcohol and deionized water, and finally freeze-drying to obtain the Ni @ RF nanowire.
Step three, Ni @ void @ Co3O4Preparing the nano wire: the prepared Ni @ RF nanowire and Co (NO) are subjected to ultrasonic treatment3)2·6H2Dispersing O, hexamethylenetetramine and trisodium citrate dihydrate in deionized water; after stirring, refluxing the mixed solution in an oil bath; after the reaction is finished, separating and washing the black precipitate, and freeze-drying to obtain Ni @ RF @ Co (OH)2Nanowires, then annealed in air atmosphere to obtain Ni @ void @ Co3O4A nanowire;
step four, Ni @ void @ Co3O4Preparation of/RGO Material: under ultrasonic treatment, the prepared Ni @ void @ Co3O4Dispersing the nanowires in a mixed solution of deionized water and a graphene suspension, and stirring to uniformly disperse the nanowires; then, transferring the mixed solution into a 100mL reaction kettle and heating; after cooling, the product was isolated and freeze dried to obtain Ni @ void @ Co3O4the/RGO composite material.
Further, in the step one, the preparation of the one-dimensional Ni nanowire includes:
dissolving 1.2g of NaOH in 35mL of ethylene glycol, stirring for 1h, adding a reducing agent of 10mL of hydrazine hydrate solution, and continuously stirring for 0.5h to obtain a mixed solution;
placing the mixed solution in a constant temperature water bath with an external magnetic field at 80 ℃, and slowly dropwise adding 15mL of 0.1mol/L NiCl into the mixed solution by using a syringe2·6H2O ethylene glycol solution;
standing for 5min, collecting the Ni nanowires by using a magnet, and washing for 3 times by using absolute ethyl alcohol and deionized water;
and (4) freeze-drying at-60 ℃ to obtain the Ni nanowire.
Further, in the second step, the preparation of the one-dimensional Ni @ RF nanowire comprises:
under ultrasonic treatment, 0.06g of Ni nanowire is dispersed in a mixed solution of 70mL of deionized water and 28mL of absolute ethyl alcohol, and then 1.5g of CTAB, 1mL of ammonia water and 0.105g of resorcinol are added;
mechanically stirring the mixed solution for 30min, injecting 0.15-0.45 mL of formaldehyde solution by using an injector, and keeping mechanical stirring for 8 h;
after the reaction is finished, separating the precipitate by using a magnet, washing the precipitate for three times by using absolute ethyl alcohol and deionized water, and finally freeze-drying the precipitate at the temperature of minus 60 ℃ to obtain the Ni @ RF nanowire.
Further, in step three, the Ni @ void @ Co3O4Preparation of nanowires comprising:
0.03g of prepared Ni @ RF nanowires, 0.116g of Co (NO) were added under sonication3)2·6H2O, 0.042g of hexamethylenetetramine and 0.015g of trisodium citrate dihydrate are dispersed in 40mL of deionized water, stirred for 30 minutes and then refluxed in an oil bath at 90 ℃ for 6 hours; after the reaction is finished, separating and washing the black precipitate, and freeze-drying at-60 ℃ to obtain Ni @ RF @ Co (OH)2The nano wire is annealed for 2 hours at 300 ℃ in an air atmosphere to obtain Ni @ void @ Co3O4A nanowire.
Further, in step four, the Ni @ void @ Co3O4Preparation of/RGO materials comprising:
under the ultrasonic treatment, 0.04g to 0.08g of prepared Ni @ void @ Co3O4The nanowires are dispersed in a mixed solution of 60mL of deionized water and 20mL of graphene suspension, and the mixture is stirred for 30min to uniformly disperse the nanowires; then, transferring the mixed solution into a 100mL reaction kettle and heating for 6h at 180 ℃; after cooling, the product was isolated and freeze dried at-60 ℃ to obtain Ni @ void @ Co3O4/RA GO composite.
The parameters in the first step influence the length-diameter ratio and the surface appearance of the Ni nanowire, the parameters in the second step influence the thickness of the phenolic resin layer, and the parameters in the third step influence the thickness of the Co nanowire3O4The thickness and the flower-shaped structure of the nanosheet layer, and the parameters in the fourth step can influence the magnetism and the wave-absorbing performance of the final product.
Another purpose of the invention is to provide the one-dimensional yolk-shell Ni @ void @ Co3O4One-dimensional yolk-shell Ni @ void @ Co prepared by preparation method of @ RGO wave absorbing agent3O4@ RGO wave-absorbing agent.
Another purpose of the invention is to provide the one-dimensional yolk-shell Ni @ void @ Co3O4The application of @ RGO wave absorber in absorbing electromagnetic wave is disclosed.
Another object of the present invention is to provide a method for improving wireless quality communication, which uses the one-dimensional yolk-shell Ni @ void @ Co3O4@ RGO wave-absorbing agent.
The invention also aims to provide a method for improving the communication quality between the airplane and the base station, which uses the one-dimensional yolk-shell Ni @ void @ Co3O4@ RGO wave-absorbing agent.
By combining all the technical schemes, the invention has the advantages and positive effects that: the invention prepares the one-dimensional Ni nanowire by a chemical reduction method, and then coats a phenolic resin layer and Co (OH) outside the nanowire2Nano-sheet layer and calcining in air to obtain one-dimensional Ni @ void @ Co3O4And the nano wire is finally compounded with the reduced graphene to obtain the final composite wave absorbing agent, and the composite wave absorbing agent is novel in structure and excellent in performance. The wave absorbing agent prepared by the invention has excellent performance and good application prospect. Ni @ void @ Co in a hierarchical structure3O4Of the nanowires, the internal magnetic Ni nanowires are dedicated to generate active magnetic loss, while flower-like Co3O4Nanoplates and RGO nanoplates support dielectric loss. In addition, one-dimensional cavities in nanowires can adjust impedance matchingThe density of the composite material is reduced, the microwave can be reflected and diffracted for many times in the cavity, and a loss path is lengthened, so that the wave absorbing performance is improved.
The one-dimensional Ni nanowire is prepared by a chemical reduction method, the reaction is simple, the cost is low, the Ni nanowire has magnetism, the magnetic loss is provided in the wave absorbing process, and a large number of bulges exist on the surface, so that not only are a plurality of active sites provided, but also incident electromagnetic waves can be reflected and diffracted for many times. By coating phenolic resin layer and Co (OH)2Method of low temperature thermal annealing after layer to obtain Co3O4The method is novel and is not reported in documents at present, and the thickness of the phenolic resin layer can be adjusted to control the thickness of the cavity layer. Co3O4The nano-sheets grow in a staggered manner, so that the surface of the one-dimensional material integrally presents a flower-shaped structure, the structure induces incident electromagnetic waves to generate multiple reflection and diffraction, and the electromagnetic wave loss path is lengthened.
The invention is rich in Ni @ void @ Co3O4The nano wires are mutually inserted and staggered to form a conductive network structure, so that the conduction loss is increased, and the electromagnetic wave is more effectively attenuated. Dipole polarization and interface polarization generated by introducing the high-conductivity RGO nanosheets adjust dielectric loss and optimize electromagnetic parameters, so that the wave absorber and electromagnetic waves achieve better impedance matching. Ni @ void @ Co3O4The material cooperation of different wave absorption loss mechanisms in the/RGO composite material improves the impedance matching of the wave absorbing agent and improves the wave absorbing performance. Ni @ void @ Co prepared by the invention3O4Compared with other reported Ni-based wave absorbers, the/RGO composite wave absorber not only has obvious advantages in structure (combination of one-dimensional wave absorber and yolk-shell), but also has comparable absorption performance.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained from the drawings without creative efforts.
FIG. 1 is a one-dimensional yolk-shell Ni @ void @ Co provided by an embodiment of the present invention3O4A flow chart of a method for preparing a @ RGO wave-absorbing agent.
Fig. 2(a), fig. 2(b) SEM images of Ni nanowires provided in embodiment 1 of the present invention; FIG. 2(c) SEM image of Ni @ RF nanowires provided in example 1 of the present invention; FIG. 2(d) Ni @ RF @ Co (OH) provided in example 1 of the present invention2SEM images of nanowires; FIG. 2(e) Ni @ void @ Co provided in example 1 of the present invention3O4SEM images of nanowires; FIG. 2(f) Ni @ void @ Co provided in example 1 of the present invention3O4SEM image of/RGO composite material.
FIG. 3 is an XRD pattern of the product provided in example 1 of the present invention; (a) is a Ni nanowire; (b) is Ni @ RF @ Co (OH)2A nanowire; (c) is Ni @ void @ Co3O4A nanowire; (d) is Ni @ void @ Co3O4the/RGO composite material.
FIG. 4 (a)1) The paraffin-based wave-absorbing material loaded with 15 wt.% of samples provided by the embodiment of the invention has a reflection loss curve under different thicknesses; FIG. 4 (a)2) FIG. 4 (a)3) The paraffin-based wave-absorbing material loaded with 15 wt.% of samples provided by the embodiment of the invention is a three-dimensional reflection loss graph under different thicknesses; FIG. 4 (b)1) The reflection loss curve of the paraffin-based wave-absorbing material loaded with 25 wt.% of samples provided by the embodiment of the invention under different thicknesses is shown; FIG. 4 (b)2) FIG. 4 (b)3) The paraffin-based wave-absorbing material loaded with 25 wt.% of samples provided by the embodiment of the invention is a three-dimensional reflection loss graph under different thicknesses; FIG. 4 (c)1) The paraffin-based wave-absorbing material loaded with 35 wt.% of samples provided by the embodiment of the invention has a reflection loss curve under different thicknesses; FIG. 4 (c)2) FIG. 4 (c)3) The three-dimensional reflection loss graph of the paraffin-based wave-absorbing material loaded with 35 wt.% of samples provided by the embodiment of the invention under different thicknesses is shown.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Aiming at the problems in the prior art, the invention provides a one-dimensional yolk-shell Ni @ void @ Co3O4The invention is described in detail below with reference to the accompanying drawings.
The embodiment of the invention provides one-dimensional yolk-shell Ni @ void @ Co3O4The preparation method of the @ RGO wave absorbing agent comprises the following steps:
with NiCl2·6H2O is a nickel source, N2H4·H2O is a reducing agent, and the Ni nanowire is synthesized by a chemical reduction method;
coating a phenolic resin RF layer on the outer side of the Ni nanowire through in-situ polymerization reaction of resorcinol and formaldehyde to obtain a one-dimensional Ni @ RF nanowire;
growing Co (OH) on the surface of the Ni @ RF nanowire by an oil bath reflux method2Nanosheets, then annealed to Co in air3O4Nanosheets; the coating phenolic resin RF reacts with air to be removed, and Ni @ void @ Co with flower-shaped surface yolk-shell structure is obtained3O4A nanowire;
uniformly mixing the nanowire and the graphene suspension, and carrying out hydrothermal reaction to prepare Ni @ void @ Co3O4the/RGO composite material.
As shown in FIG. 1, a one-dimensional yolk-shell Ni @ void @ Co provided by the embodiment of the invention3O4The preparation method of the @ RGO wave absorbing agent comprises the following steps:
s101, preparing a one-dimensional Ni nanowire: dissolving NaOH in ethylene glycol, adding a reducing agent hydrazine hydrate solution after stirring, and continuously stirring to obtain a mixed solution; placing the mixed solution in a constant-temperature water bath with an external magnetic field, and then slowly dripping NiCl into the mixed solution by using a syringe2·6H2O ethylene glycol solution; after standing, collecting the Ni nanowires by using a magnet, washing the Ni nanowires for three times by using absolute ethyl alcohol and deionized water, and finally freeze-drying;
s102, preparation of one-dimensional Ni @ RF nanowires: under ultrasonic treatment, dispersing Ni nanowires in a mixed solution of deionized water and absolute ethyl alcohol, and then adding CTAB, ammonia water and resorcinol; mechanically stirring the mixed solution, injecting a formaldehyde solution by using an injector, and keeping mechanical stirring; and after the reaction is finished, separating the precipitate by using a magnet, washing the precipitate for three times by using absolute ethyl alcohol and deionized water, and finally freeze-drying to obtain the Ni @ RF nanowire.
S103，Ni@void@Co3O4Preparing the nano wire: the prepared Ni @ RF nanowire and Co (NO) are subjected to ultrasonic treatment3)2·6H2Dispersing O, hexamethylenetetramine and trisodium citrate dihydrate in deionized water; after stirring, refluxing the mixed solution in an oil bath; after the reaction is finished, separating and washing the black precipitate, and freeze-drying to obtain Ni @ RF @ Co (OH)2Nanowires, then annealed in air atmosphere to obtain Ni @ void @ Co3O4A nanowire;
S104，Ni@void@Co3O4preparation of/RGO Material: under ultrasonic treatment, the prepared Ni @ void @ Co3O4Dispersing the nanowires in a mixed solution of deionized water and a graphene suspension, and stirring to uniformly disperse the nanowires; then, transferring the mixed solution into a 100mL reaction kettle and heating; after cooling, the product was isolated and freeze dried to obtain Ni @ void @ Co3O4the/RGO composite material.
In step S101, the preparation of the one-dimensional Ni nanowire provided in the embodiment of the present invention includes:
dissolving 1.2g of NaOH in 35mL of ethylene glycol, stirring for 1h, adding a reducing agent of 10mL of hydrazine hydrate solution, and continuously stirring for 0.5h to obtain a mixed solution;
placing the mixed solution in a constant temperature water bath with an external magnetic field at 80 ℃, and slowly dropwise adding 15mL of 0.1mol/L NiCl into the mixed solution by using a syringe2·6H2O ethylene glycol solution;
standing for 5min, collecting the Ni nanowires by using a magnet, and washing for 3 times by using absolute ethyl alcohol and deionized water;
and (4) freeze-drying at-60 ℃ to obtain the Ni nanowire.
In step S102, the preparation of the one-dimensional Ni @ RF nanowire provided in the embodiment of the present invention includes:
under ultrasonic treatment, 0.06g of Ni nanowire is dispersed in a mixed solution of 70mL of deionized water and 28mL of absolute ethyl alcohol, and then 1.5g of CTAB, 1mL of ammonia water and 0.105g of resorcinol are added;
mechanically stirring the mixed solution for 30min, injecting 0.15-0.45 mL of formaldehyde solution by using an injector, and keeping mechanical stirring for 8 h;
after the reaction is finished, separating the precipitate by using a magnet, washing the precipitate for three times by using absolute ethyl alcohol and deionized water, and finally freeze-drying the precipitate at the temperature of minus 60 ℃ to obtain the Ni @ RF nanowire.
In step S103, Ni @ void @ Co provided in the embodiment of the present invention3O4Preparation of nanowires comprising:
0.03g of prepared Ni @ RF nanowires, 0.116g of Co (NO) were added under sonication3)2·6H2O, 0.042g of hexamethylenetetramine and 0.015g of trisodium citrate dihydrate are dispersed in 40mL of deionized water, stirred for 30 minutes and then refluxed in an oil bath at 90 ℃ for 6 hours; after the reaction is finished, separating and washing the black precipitate, and freeze-drying at-60 ℃ to obtain Ni @ RF @ Co (OH)2The nano wire is annealed for 2 hours at 300 ℃ in an air atmosphere to obtain Ni @ void @ Co3O4A nanowire.
In step S104, Ni @ void @ Co provided in the embodiment of the present invention3O4Preparation of/RGO materials comprising:
under the ultrasonic treatment, 0.04g to 0.08g of prepared Ni @ void @ Co3O4The nanowires are dispersed in a mixed solution of 60mL of deionized water and 20mL of graphene suspension, and the mixture is stirred for 30min to uniformly disperse the nanowires; then, transferring the mixed solution into a 100mL reaction kettle and heating for 6h at 180 ℃; after cooling, the product was isolated and freeze dried at-60 ℃ to obtain Ni @ void @ Co3O4the/RGO composite material.
The technical solution of the present invention is further described with reference to the following examples.
Example 1
Examples of the inventionProvided one-dimensional yolk-shell Ni @ void @ Co3O4The preparation method of the @ RGO wave absorbing agent comprises the following steps:
(1) preparing a one-dimensional Ni nanowire: 1.2g NaOH was dissolved in 35mL ethylene glycol, and after stirring for 1h, 10mL hydrazine hydrate solution as reducing agent was added to the solution, and stirring was continued for 0.5 h. The mixed solution was placed in a 80 ℃ thermostatic water bath with an external magnetic field, and then 15mL of NiCl was slowly dropped thereinto with a syringe2·6H2O ethylene glycol solution (0.1 mol/L). Standing for 5min, collecting Ni nanowires with magnet, washing with anhydrous ethanol and deionized water for 3 times, and freeze drying at-60 deg.C.
(2) Preparation of one-dimensional Ni @ RF nanowires: under ultrasonic treatment, 0.06g of Ni nanowires were dispersed in a mixed solution of 70mL of deionized water and 28mL of anhydrous ethanol, and then 1.5g of CTAB, 1mL of aqueous ammonia and 0.105g of resorcinol were added. The above mixed solution was mechanically stirred for 30min, and then 0.15mL of formaldehyde solution was injected by a syringe, followed by maintaining the mechanical stirring for 8 h. After the reaction is finished, separating the precipitate by using a magnet, washing the precipitate for three times by using absolute ethyl alcohol and deionized water, and finally freeze-drying the precipitate at the temperature of minus 60 ℃ to obtain the Ni @ RF nanowire.
(3)Ni@void@Co3O4Preparation of/RGO Material: 0.03g of prepared Ni @ RF nanowires, 0.116g of Co (NO) were added under sonication3)2·6H2O, 0.042g hexamethylenetetramine and 0.015g trisodium citrate dihydrate were dispersed in 40mL deionized water. After stirring for 30 minutes, the mixed solution was refluxed in an oil bath at 90 ℃ for 6 hours. After the reaction is finished, separating and washing the black precipitate, and freeze-drying at-60 ℃ to obtain Ni @ RF @ Co (OH)2Nanowires were then annealed at 300 ℃ for 2h in air atmosphere to obtain Ni @ void @ Co3O4A nanowire. Under ultrasonic treatment, 0.08g of prepared Ni @ void @ Co3O4And dispersing the nanowires in a mixed solution of 60mL of deionized water and 20mL of graphene suspension, and stirring for 30min to uniformly disperse the nanowires. Then, the mixed solution was transferred to a 100mL reaction tank and heated at 180 ℃ for 6 hours. After cooling, the product was isolated and freeze dried at-60 ℃ to obtain Ni @ void @ Co3O4/RGOA composite material. The SEM image and XRD of the product are shown in FIG. 3.
Example 2
The embodiment of the invention provides one-dimensional yolk-shell Ni @ void @ Co3O4The preparation method of the @ RGO wave absorbing agent comprises the following steps:
(1) preparing a one-dimensional Ni nanowire: 1.2g NaOH was dissolved in 35mL ethylene glycol, and after stirring for 1h, 10mL hydrazine hydrate solution as reducing agent was added to the solution, and stirring was continued for 0.5 h. The mixed solution was placed in a 80 ℃ thermostatic water bath with an external magnetic field, and then 15mL of NiCl was slowly dropped thereinto with a syringe2·6H2O ethylene glycol solution (0.1 mol/L). Standing for 5min, collecting Ni nanowires with magnet, washing with anhydrous ethanol and deionized water for 3 times, and freeze drying at-60 deg.C.
(2) Preparation of one-dimensional Ni @ RF nanowires: under ultrasonic treatment, 0.06g of Ni nanowires were dispersed in a mixed solution of 70mL of deionized water and 28mL of anhydrous ethanol, and then 1.5g of CTAB, 1mL of aqueous ammonia and 0.105g of resorcinol were added. The above mixed solution was mechanically stirred for 30min, and then 0.15mL of formaldehyde solution was injected by a syringe, followed by maintaining the mechanical stirring for 8 h. After the reaction is finished, separating the precipitate by using a magnet, washing the precipitate for three times by using absolute ethyl alcohol and deionized water, and finally freeze-drying the precipitate at the temperature of minus 60 ℃ to obtain the Ni @ RF nanowire.
(3)Ni@void@Co3O4Preparation of/RGO Material: 0.03g of prepared Ni @ RF nanowires, 0.116g of Co (NO) were added under sonication3)2·6H2O, 0.042g hexamethylenetetramine and 0.015g trisodium citrate dihydrate were dispersed in 40mL deionized water. After stirring for 30 minutes, the mixed solution was refluxed in an oil bath at 90 ℃ for 6 hours. After the reaction is finished, separating and washing the black precipitate, and freeze-drying at-60 ℃ to obtain Ni @ RF @ Co (OH)2Nanowires were then annealed at 300 ℃ for 2h in air atmosphere to obtain Ni @ void @ Co3O4A nanowire. 0.04g of Ni @ void @ Co prepared was sonicated3O4And dispersing the nanowires in a mixed solution of 60mL of deionized water and 20mL of graphene suspension, and stirring for 30min to uniformly disperse the nanowires. Then, the mixed solution is dissolvedThe solution was transferred to a 100mL autoclave and heated at 180 ℃ for 6 h. After cooling, the product was isolated and freeze dried at-60 ℃ to obtain Ni @ void @ Co3O4the/RGO composite material.
Example 3
The embodiment of the invention provides one-dimensional yolk-shell Ni @ void @ Co3O4The preparation method of the @ RGO wave absorbing agent comprises the following steps:
(1) preparing a one-dimensional Ni nanowire: 1.2g NaOH was dissolved in 35mL ethylene glycol, and after stirring for 1h, 10mL hydrazine hydrate solution as reducing agent was added to the solution, and stirring was continued for 0.5 h. The mixed solution was placed in a 80 ℃ thermostatic water bath with an external magnetic field, and then 15mL of NiCl was slowly dropped thereinto with a syringe2·6H2O ethylene glycol solution (0.1 mol/L). Standing for 5min, collecting Ni nanowires with magnet, washing with anhydrous ethanol and deionized water for 3 times, and freeze drying at-60 deg.C.
(2) Preparation of one-dimensional Ni @ RF nanowires: under ultrasonic treatment, 0.06g of Ni nanowires were dispersed in a mixed solution of 70mL of deionized water and 28mL of anhydrous ethanol, and then 1.5g of CTAB, 1mL of aqueous ammonia and 0.105g of resorcinol were added. The above mixed solution was mechanically stirred for 30min, and then 0.15mL of formaldehyde solution was injected by a syringe, followed by maintaining the mechanical stirring for 8 h. After the reaction is finished, separating the precipitate by using a magnet, washing the precipitate for three times by using absolute ethyl alcohol and deionized water, and finally freeze-drying the precipitate at the temperature of minus 60 ℃ to obtain the Ni @ RF nanowire.
(3)Ni@void@Co3O4Preparation of/RGO Material: 0.03g of prepared Ni @ RF nanowires, 0.116g of Co (NO) were added under sonication3)2·6H2O, 0.042g hexamethylenetetramine and 0.015g trisodium citrate dihydrate were dispersed in 40mL deionized water. After stirring for 30 minutes, the mixed solution was refluxed in an oil bath at 90 ℃ for 6 hours. After the reaction is finished, separating and washing the black precipitate, and freeze-drying at-60 ℃ to obtain Ni @ RF @ Co (OH)2Nanowires were then annealed at 300 ℃ for 5h in air atmosphere to obtain Ni @ void @ Co3O4A nanowire. Under ultrasonic treatment, 0.08g of prepared Ni @ void @ Co3O4The nanowires are dispersed in 60mLAnd stirring the mixed solution of the ionized water and 20mL of the graphene suspension for 30min to uniformly disperse the nanowires. Then, the mixed solution was transferred to a 100mL reaction tank and heated at 180 ℃ for 6 hours. After cooling, the product was isolated and freeze dried at-60 ℃ to obtain Ni @ void @ Co3O4the/RGO composite material.
Example 4
The embodiment of the invention provides one-dimensional yolk-shell Ni @ void @ Co3O4The preparation method of the @ RGO wave absorbing agent comprises the following steps:
(1) preparing a one-dimensional Ni nanowire: 1.2g NaOH was dissolved in 35mL ethylene glycol, and after stirring for 1h, 10mL hydrazine hydrate solution as reducing agent was added to the solution, and stirring was continued for 0.5 h. The mixed solution was placed in a 80 ℃ thermostatic water bath with an external magnetic field, and then 15mL of NiCl was slowly dropped thereinto with a syringe2·6H2O ethylene glycol solution (0.1 mol/L). Standing for 5min, collecting Ni nanowires with magnet, washing with anhydrous ethanol and deionized water for 3 times, and freeze drying at-60 deg.C.
(2) Preparation of one-dimensional Ni @ RF nanowires: under ultrasonic treatment, 0.06g of Ni nanowires were dispersed in a mixed solution of 70mL of deionized water and 28mL of anhydrous ethanol, and then 1.5g of CTAB, 1mL of aqueous ammonia and 0.105g of resorcinol were added. The above mixed solution was mechanically stirred for 30min, and then 0.15mL of formaldehyde solution was injected by a syringe, followed by maintaining the mechanical stirring for 8 h. After the reaction is finished, separating the precipitate by using a magnet, washing the precipitate for three times by using absolute ethyl alcohol and deionized water, and finally freeze-drying the precipitate at the temperature of minus 60 ℃ to obtain the Ni @ RF nanowire.
(3)Ni@void@Co3O4Preparation of/RGO Material: 0.04g of prepared Ni @ RF nanowires, 0.116g of Co (NO) were added under sonication3)2·6H2O, 0.042g hexamethylenetetramine and 0.015g trisodium citrate dihydrate were dispersed in 40mL deionized water. After stirring for 30 minutes, the mixed solution was refluxed in an oil bath at 90 ℃ for 6 hours. After the reaction is finished, separating and washing the black precipitate, and freeze-drying at-60 ℃ to obtain Ni @ RF @ Co (OH)2Nanowires were then annealed at 300 ℃ for 2h in air atmosphere to obtain Ni @ void @ Co3O4A nanowire. Under ultrasonic treatment, 0.08g of prepared Ni @ void @ Co3O4And dispersing the nanowires in a mixed solution of 60mL of deionized water and 20mL of graphene suspension, and stirring for 30min to uniformly disperse the nanowires. Then, the mixed solution was transferred to a 100mL reaction tank and heated at 180 ℃ for 6 hours. After cooling, the product was isolated and freeze dried at-60 ℃ to obtain Ni @ void @ Co3O4the/RGO composite material.
Example 5
The embodiment of the invention provides one-dimensional yolk-shell Ni @ void @ Co3O4The preparation method of the @ RGO wave absorbing agent comprises the following steps:
(1) preparing a one-dimensional Ni nanowire: 1.2g NaOH was dissolved in 35mL ethylene glycol, and after stirring for 1h, 10mL hydrazine hydrate solution as reducing agent was added to the solution, and stirring was continued for 0.5 h. The mixed solution was placed in a 80 ℃ thermostatic water bath with an external magnetic field, and then 15mL of NiCl was slowly dropped thereinto with a syringe2·6H2O ethylene glycol solution (0.1 mol/L). Standing for 5min, collecting Ni nanowires with magnet, washing with anhydrous ethanol and deionized water for 3 times, and freeze drying at-60 deg.C.
(2) Preparation of one-dimensional Ni @ RF nanowires: under ultrasonic treatment, 0.06g of Ni nanowires were dispersed in a mixed solution of 70mL of deionized water and 28mL of anhydrous ethanol, and then 1.5g of CTAB, 1mL of aqueous ammonia and 0.315g of resorcinol were added. The above mixed solution was mechanically stirred for 30min, and then 0.45mL of formaldehyde solution was injected by a syringe, followed by maintaining the mechanical stirring for 8 h. After the reaction is finished, separating the precipitate by using a magnet, washing the precipitate for three times by using absolute ethyl alcohol and deionized water, and finally freeze-drying the precipitate at the temperature of minus 60 ℃ to obtain the Ni @ RF nanowire.
(3)Ni@void@Co3O4Preparation of/RGO Material: 0.03g of prepared Ni @ RF nanowires, 0.116g of Co (NO) were added under sonication3)2·6H2O, 0.042g hexamethylenetetramine and 0.015g trisodium citrate dihydrate were dispersed in 40mL deionized water. After stirring for 30 minutes, the mixed solution was refluxed in an oil bath at 90 ℃ for 6 hours. After the reaction is finished, separating and washing the black precipitate, and freeze-drying at-60 ℃ to obtain Ni @ RF@Co(OH)2Nanowires were then annealed at 300 ℃ for 2h in air atmosphere to obtain Ni @ void @ Co3O4A nanowire. Under ultrasonic treatment, 0.08g of prepared Ni @ void @ Co3O4And dispersing the nanowires in a mixed solution of 60mL of deionized water and 20mL of graphene suspension, and stirring for 30min to uniformly disperse the nanowires. Then, the mixed solution was transferred to a 100mL reaction tank and heated at 180 ℃ for 6 hours. After cooling, the product was isolated and freeze dried at-60 ℃ to obtain Ni @ void @ Co3O4the/RGO composite material.
Example 6
Sample Ni @ void @ Co prepared in example 1 was analyzed using a vector network analyzer3O4The electromagnetic parameters and the wave absorbing performance of the/RGO composite material are analyzed, and the result is shown in figure 4. FIG. 4 is a reflection loss curve and a three-dimensional reflection loss graph of paraffin-based wave-absorbing material loaded with different contents (a: 15 wt.%, b: 25 wt.%, c: 35 wt.%) of samples under different thicknesses, and is obtained from FIG. 4 (c: 35 wt.%)1) It was found that for the 35 wt.% loaded sample, a minimum reflection loss value of-60.0 dB was achieved at a thickness of 2.3mm, and a maximum effective absorption bandwidth of 4.62GHz was achieved at a thickness of 1.6 mm.
The above description is only for the purpose of illustrating the present invention and the appended claims are not to be construed as limiting the scope of the invention, which is intended to cover all modifications, equivalents and improvements that are within the spirit and scope of the invention as defined by the appended claims.

Claims (10)

1. One-dimensional yolk-shell Ni @ void @ Co3O4The preparation method of the @ RGO wave absorbing agent is characterized in that the one-dimensional yolk-shell Ni @ void @ Co3O4Preparation method of @ RGO wave absorbing agent with NiCl2·6H2O is a nickel source, N2H4·H2O is a reducing agent, and the Ni nanowire is synthesized by a chemical reduction method; coating a phenolic resin RF layer on the outer side of the Ni nanowire through in-situ polymerization reaction of resorcinol and formaldehyde to obtain a one-dimensional Ni @ RF nanowire; by means of an oil bathGrowing Co (OH) on the surface of the Ni @ RF nanowire by a reflux method2Nanosheets annealed to Co in air3O4Nanosheets; the coating phenolic resin RF reacts with air to be removed, and Ni @ void @ Co with flower-shaped surface yolk-shell structure is obtained3O4A nanowire; uniformly mixing the nanowire and the graphene suspension, and carrying out hydrothermal reaction to prepare Ni @ void @ Co3O4the/RGO composite material.
2. The one-dimensional yolk-shell Ni @ void @ Co of claim 13O4The preparation method of the @ RGO wave absorbing agent is characterized in that the one-dimensional yolk-shell Ni @ void @ Co3O4The preparation method of the @ RGO wave absorbing agent comprises the following steps:
step one, preparing a one-dimensional Ni nanowire: dissolving NaOH in ethylene glycol, adding a reducing agent hydrazine hydrate solution after stirring, and continuously stirring to obtain a mixed solution; placing the mixed solution in a constant-temperature water bath with an external magnetic field, and then slowly dripping NiCl into the mixed solution by using a syringe2·6H2O ethylene glycol solution; after standing, collecting the Ni nanowires by using a magnet, washing the Ni nanowires for three times by using absolute ethyl alcohol and deionized water, and finally freeze-drying;
step two, preparing the one-dimensional Ni @ RF nanowire: under ultrasonic treatment, dispersing Ni nanowires in a mixed solution of deionized water and absolute ethyl alcohol, and then adding Cetyl Trimethyl Ammonium Bromide (CTAB), ammonia water and resorcinol; mechanically stirring the mixed solution, injecting a formaldehyde solution by using an injector, and keeping mechanical stirring; after the reaction is finished, separating the precipitate by using a magnet, washing the precipitate for three times by using absolute ethyl alcohol and deionized water, and finally freeze-drying to obtain the Ni @ RF nanowire;
step three, Ni @ void @ Co3O4Preparing the nano wire: the prepared Ni @ RF nanowire and Co (NO) are subjected to ultrasonic treatment3)2·6H2Dispersing O, hexamethylenetetramine and trisodium citrate dihydrate in deionized water; after stirring, refluxing the mixed solution in an oil bath; after the reaction is finished, separating and washing the black precipitate, and freeze-drying to obtain Ni @ RF @ Co (OH)2Nanowires, then annealed in air atmosphere to obtain Ni @ void @ Co3O4A nanowire;
step four, Ni @ void @ Co3O4Preparation of/RGO Material: under ultrasonic treatment, the prepared Ni @ void @ Co3O4Dispersing the nanowires in a mixed solution of deionized water and a graphene suspension, and stirring to uniformly disperse the nanowires; then, transferring the mixed solution into a 100mL reaction kettle and heating; after cooling, the product was isolated and freeze dried to obtain Ni @ void @ Co3O4the/RGO composite material.
3. The one-dimensional yolk-shell Ni @ void @ Co of claim 23O4The preparation method of the @ RGO wave absorbing agent is characterized in that in the first step, the preparation of the one-dimensional Ni nanowire comprises the following steps:
dissolving 1.2g of NaOH in 35mL of ethylene glycol, stirring for 1h, adding a reducing agent of 10mL of hydrazine hydrate solution, and continuously stirring for 0.5h to obtain a mixed solution;
placing the mixed solution in a constant temperature water bath with an external magnetic field at 80 ℃, and slowly dropwise adding 15mL of 0.1mol/L NiCl into the mixed solution by using a syringe2·6H2O ethylene glycol solution;
standing for 5min, collecting the Ni nanowires by using a magnet, and washing for 3 times by using absolute ethyl alcohol and deionized water;
and (4) freeze-drying at-60 ℃ to obtain the Ni nanowire.
4. The one-dimensional yolk-shell Ni @ void @ Co of claim 23O4The preparation method of the @ RGO wave absorbing agent is characterized in that in the second step, the preparation of the one-dimensional Ni @ RF nanowire comprises the following steps:
under ultrasonic treatment, 0.06g of Ni nanowire is dispersed in a mixed solution of 70mL of deionized water and 28mL of absolute ethyl alcohol, and then 1.5g of CTAB, 1mL of ammonia water and 0.105g of resorcinol are added;
mechanically stirring the mixed solution for 30min, injecting 0.15-0.45 mL of formaldehyde solution by using an injector, and keeping mechanical stirring for 8 h;
after the reaction is finished, separating the precipitate by using a magnet, washing the precipitate for three times by using absolute ethyl alcohol and deionized water, and finally freeze-drying the precipitate at the temperature of minus 60 ℃ to obtain the Ni @ RF nanowire.
5. The one-dimensional yolk-shell Ni @ void @ Co of claim 23O4The preparation method of the @ RGO wave absorbing agent is characterized in that in the step III, the Ni @ void @ Co3O4Preparation of nanowires comprising:
0.03g of prepared Ni @ RF nanowires, 0.116g of Co (NO) were added under sonication3)2·6H2O, 0.042g of hexamethylenetetramine and 0.015g of trisodium citrate dihydrate are dispersed in 40mL of deionized water, stirred for 30 minutes and then refluxed in an oil bath at 90 ℃ for 6 hours; after the reaction is finished, separating and washing the black precipitate, and freeze-drying at-60 ℃ to obtain Ni @ RF @ Co (OH)2The nano wire is annealed for 2 hours at 300 ℃ in an air atmosphere to obtain Ni @ void @ Co3O4A nanowire.
6. The one-dimensional yolk-shell Ni @ void @ Co of claim 23O4The preparation method of the @ RGO wave absorbing agent is characterized in that in the fourth step, the Ni @ void @ Co3O4Preparation of/RGO materials comprising:
under the ultrasonic treatment, 0.04g to 0.08g of prepared Ni @ void @ Co3O4The nanowires are dispersed in a mixed solution of 60mL of deionized water and 20mL of graphene suspension, and the mixture is stirred for 30min to uniformly disperse the nanowires; then, transferring the mixed solution into a 100mL reaction kettle and heating for 6h at 180 ℃; after cooling, the product was isolated and freeze dried at-60 ℃ to obtain Ni @ void @ Co3O4the/RGO composite material.
7. One-dimensional yolk-shell Ni @ void @ Co of claims 1-63O4One-dimensional yolk-shell Ni @ void @ Co prepared by preparation method of @ RGO wave absorbing agent3O4@ RGO wave-absorbing agent.
8. Use of the wave absorber of claim 7 for absorbing electromagnetic waves.
9. A method for improving wireless quality communication, wherein the method for improving wireless quality communication uses the one-dimensional yolk-shell Ni @ void @ Co of claim 83O4@ RGO wave-absorbing agent.
10. A method for improving communication quality between an aircraft and a base station, characterized in that the method for improving communication quality between an aircraft and a base station uses the one-dimensional yolk-shell Ni @ void @ Co of claim 83O4@ RGO wave-absorbing agent.
CN202110281143.4A 2021-03-16 2021-03-16 One-dimensional yolk-shell Ni @ void @ Co3O4@ RGO wave absorbing agent and preparation method thereof Pending CN113068385A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110281143.4A CN113068385A (en) 2021-03-16 2021-03-16 One-dimensional yolk-shell Ni @ void @ Co3O4@ RGO wave absorbing agent and preparation method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110281143.4A CN113068385A (en) 2021-03-16 2021-03-16 One-dimensional yolk-shell Ni @ void @ Co3O4@ RGO wave absorbing agent and preparation method thereof

Publications (1)

Publication Number Publication Date
CN113068385A true CN113068385A (en) 2021-07-02

Family

ID=76561109

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110281143.4A Pending CN113068385A (en) 2021-03-16 2021-03-16 One-dimensional yolk-shell Ni @ void @ Co3O4@ RGO wave absorbing agent and preparation method thereof

Country Status (1)

Country Link
CN (1) CN113068385A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113903910A (en) * 2021-09-29 2022-01-07 湖北大学 Carbon cloth/cobaltosic oxide nanowire composite material and preparation method and application thereof
CN114212779A (en) * 2021-12-28 2022-03-22 洛阳尖端技术研究院 Preparation method of composite wave-absorbing material and composite wave-absorbing material

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104900420A (en) * 2015-04-03 2015-09-09 中南大学 NiCo2O4@MOx material of hollow core-shell structure and preparation and application methods thereof
CN108690556A (en) * 2018-06-29 2018-10-23 安徽理工大学 A kind of preparation method of redox graphene/multi-walled carbon nanotube/Ni ferrite ternary nano composite wave-suction material
US20190376209A1 (en) * 2018-06-08 2019-12-12 The Regents Of The University Of California Method and system for production of porous graphitic carbon materials embedded with active components
CN111640585A (en) * 2020-06-05 2020-09-08 扬州大学 N-CNT @ Co applied to super capacitor3O4/C@Ni(OH)2Composite material and preparation method thereof

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104900420A (en) * 2015-04-03 2015-09-09 中南大学 NiCo2O4@MOx material of hollow core-shell structure and preparation and application methods thereof
US20190376209A1 (en) * 2018-06-08 2019-12-12 The Regents Of The University Of California Method and system for production of porous graphitic carbon materials embedded with active components
CN108690556A (en) * 2018-06-29 2018-10-23 安徽理工大学 A kind of preparation method of redox graphene/multi-walled carbon nanotube/Ni ferrite ternary nano composite wave-suction material
CN111640585A (en) * 2020-06-05 2020-09-08 扬州大学 N-CNT @ Co applied to super capacitor3O4/C@Ni(OH)2Composite material and preparation method thereof

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
JUNRU MA: "A facile fabrication and highly tunable microwave absorption of 3D flowerlike Co3O4-rGO hybrid-architectures", CHEMICAL ENGINEERING JOURNAL, no. 339, pages 487 - 498 *
WEIHUA GU: "Composition and Structure Design of Co3O4 Nanowires Network by Nickel Foam with Effective Electromagnetic Performance in C and X Band", ACS SUSTAINABLE CHEM. ENG., no. 7, pages 5543 *
XIUBING LI: "Enhanced electromagnetic wave absorption performances of Co3O4 nanocube/reduced graphene oxide composite", SYNTHETIC METALS, no. 194, pages 52 - 58 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113903910A (en) * 2021-09-29 2022-01-07 湖北大学 Carbon cloth/cobaltosic oxide nanowire composite material and preparation method and application thereof
CN114212779A (en) * 2021-12-28 2022-03-22 洛阳尖端技术研究院 Preparation method of composite wave-absorbing material and composite wave-absorbing material
CN114212779B (en) * 2021-12-28 2023-07-21 洛阳尖端技术研究院 Preparation method of composite wave-absorbing material and composite wave-absorbing material

Similar Documents

Publication Publication Date Title
Zou et al. 0D/1D/2D architectural Co@ C/MXene composite for boosting microwave attenuation performance in 2–18 GHz
Tan et al. Ferrero Rocher® chocolates-like FeCo/C microspheres with adjustable electromagnetic properties for effective microwave absorption
Zhang et al. Confinedly growing and tailoring of Co3O4 clusters-WS2 nanosheets for highly efficient microwave absorption
CN108330471B (en) Preparation method of yolk type double-shell hollow composite wave-absorbing material
US20220274844A1 (en) Core-shell structure type wave absorbing material, preparation method therefor, and application
Pang et al. MnFe2O4-coated carbon nanotubes with enhanced microwave absorption: Effect of CNT content and hydrothermal reaction time
CN107626931B (en) Preparation and application of cobalt-graphene composite material for absorbing electromagnetic waves
CN110283570B (en) FeCo @ MXene core-shell structure composite wave-absorbing material and preparation method thereof
Dai et al. Construction of Ni@ polypyrrole nanochains/Ti 3 C 2 T x ternary composites with excellent microwave absorption properties
CN110181070A (en) A kind of the Ni/C composite material and preparation method and application of hollow ball-shape
Peng et al. Achieving ultra-high electromagnetic wave absorption by anchoring Co0. 33Ni0. 33Mn0. 33Fe2O4 nanoparticles on graphene sheets using microwave-assisted polyol method
Wang et al. Heterostructure design of 3D hydrangea-like Fe3O4/Fe7S8@ C core-shell composite as a high-efficiency microwave absorber
CN113068385A (en) One-dimensional yolk-shell Ni @ void @ Co3O4@ RGO wave absorbing agent and preparation method thereof
Huang et al. Fabrication of flower-like ZnFe2O4@ SiO2@ C@ NiO nanochains/reduced graphene oxides as a high-performance microwave absorber
CN107365567B (en) Wave-absorbing material with carbon fiber surface coated with magnetic ferrite carbon nano-tubes and preparation method and application thereof
Wang et al. High-performance electromagnetic wave absorption of NiCoFe/N-doped carbon composites with a Prussian blue analog (PBA) core at 2-18 GHz
Zhou et al. Facile synthesis of ZIF-67 derived dodecahedral C/NiCO 2 S 4 with broadband microwave absorption performance
CN110666157A (en) Core-shell structure C @ CoNi composite material and preparation method and application thereof
Tian et al. A 3D flower-like Fe3O4@ PPy composite with core-shell heterostructure as a lightweight and efficient microwave absorbent
Liu et al. Novel preparation of FeCo alloy/graphene foam composites for efficient microwave absorption
Chen et al. Effect of different morphologies induced by in situ semi-conversion strategy on MOF-derived microwave absorbers
Lv et al. MXene/bimetallic CoNi-MOF derived magnetic-dielectric balanced composites with multiple heterogeneous interfaces for excellent microwave absorption
CN112920774A (en) Hexagonal Co @ C wave absorber, preparation method and application
CN111017902A (en) Preparation method of three-dimensional continuous porous carbon material
Zhu et al. Three-dimensional biotemplate-loaded nickel sulfide vacancies engineered to promote the absorption of electromagnetic waves

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination