Patent Application
20220298601
This patent application claims the benefit and priority of Chinese Patent Application No. 202110282222.7, filed on Mar. 16, 2021, the disclosure of which is incorporated by reference herein in its entirety.
The present disclosure belongs to the technical field of wave absorbing materials, in particular relates to a one-dimensional coralloid NiS/Ni3S4@PPy@MoS2-based wave absorber, and a preparation method and use thereof.
In recent years, due to the widespread use of electromagnetic equipment, electromagnetic wave radiation has gradually become a serious social problem. High-energy electromagnetic radiation has produced great adverse effects in both civilian and military fields. Interfering radio waves generated by gigahertz electromagnetic waves can seriously affect the communication between aircraft and base stations. In addition, prolonged exposure to gigahertz radio frequency radiation can damage the human body's immune system and develop other diseases. To solve these problems, there is an urgent need for efficient electromagnetic wave absorbers.
Wave absorbers with a single loss mechanism cannot meet the requirements of “thin, light, wide and strong” emphasized by impedance matching and wave absorbing materials, which makes composite wave absorbing materials with multiple loss mechanisms attract extensive attention. In addition to material composition, structural design is also a major direction in the study of wave absorbing materials. Due to the unique shape anisotropy and high surface-to-volume ratio, the one-dimensional structure enlarges the transmission path of electromagnetic waves inside materials, such that the electromagnetic waves are fully absorbed during the transmission to increase an attenuation effect. Most of MoS2 in the reported literatures about wave absorbing are MoS2 nanosheet. The MoS2 nanosheets, due to a simple preparation method and desirable electrochemical performances, have received extensive attention of researchers. However, MoS2 nanorods have a relatively complicated preparation method. There are few reports on the MoS2 nanorods. In addition, there are also few reports of nickel sulfides in the field of microwave absorption.
Through the above analysis, the existing problems and defects in the prior art are as follows: most of the MoS2 in the reported literatures about wave absorbing are nanosheet MoS2. There are few reports on the MoS2 nanorods. In addition, there are also few reports of nickel sulfides in the field of microwave absorption.
The difficulty of solving the above problems and defects is: the MoS2 nanorods have a more complicated preparation method than that of the MoS2 nanosheet due to the requirements of templates or additives such as surfactants. Moreover, in the field of microwave absorption, due to a unique flower-like structure to enhance the microwave loss ability, the MoS2 nanosheet has received extensive attention. There are few literatures on the wave-absorbing ability of MoS2 nanorods. In addition, there are also few reports of nickel sulfides in the field of microwave absorption.
The significance of solving the above problems and defects is: the present disclosure provides a method for preparing MoS2 nanorods with simple steps and a low cost, which is different from a template method, a surfactant addition method and the like in the prior art, thereby enriching preparation methods of the MoS2 nanorods. In addition, in the present disclosure, a one-dimensional nickel sulfide compound (NiS/Ni3S4) is prepared, with a novel structure different from the reported spherical or amorphous structures. This provides a new idea for preparation of novel nickel sulfides, as well as provides theoretical and technical supports for use of the nickel sulfide-based wave absorbers.
In view of this, the present disclosure provides a one-dimensional coralloid NiS/Ni3S4@PPy@MoS2-based wave absorber, and a preparation method and use thereof.
The present disclosure provides a preparation method of a one-dimensional coralloid NiS/Ni3S4@PPy@MoS2-based wave absorber, including the following steps: preparing one-dimensional Ni nanowires by a reduction method; coating a layer of polypyrrole (PPy) on the Ni nanowires by an in-situ polymerization method using pyrrole as a monomer, to obtain Ni@PPy nanowires; and coating MoS2 nanorods on the Ni@PPy nanowires by a hydrothermal synthesis method.
Further, the preparation method of a one-dimensional coralloid NiS/Ni3S4@PPy@MoS2-based wave absorber may include the following steps.
Step 1, preparation of the one-dimensional Ni nanowires: dissolving NaOH in ethylene glycol, stirring to obtain a solution, adding a hydrazine hydrate solution as a reducing agent to the solution, followed by continuous stirring; placing an obtained mixed solution in a constant-temperature water bath with an external magnetic field, followed by adding a NiCl2.6H2O ethylene glycol solution dropwise with a syringe; and after standing, collecting the Ni nanowires with a magnet, followed by washing with absolute ethanol and deionized water, and conducting freeze-drying.
Step 2, preparation of the one-dimensional Ni@PPy nanowires: dispersing sodium dodecylbenzenesulfonate (SDBS) and the pyrrole in the deionized water under sonication, and adding the Ni nanowires to an obtained mixture under the sonication; after mechanically stirring the mixture, adding a FeCl3 aqueous solution; continuing to conduct aggregation; and separating a precipitate with the magnet, followed by washing and freeze-drying to obtain the Ni@PPy nanowires.
Step 3, preparation of the one-dimensional coralloid NiS/Ni3S4@PPy@MoS2-based wave absorber: under ultrasonication, dissolving Na2MoO4 and thioacetamide in the deionized water, adding the Ni@PPy nanowires, and mechanically stirring an obtained mixed solution continuously; transferring the entire mixed solution to an autoclave for reaction; and after the reaction is completed, separating a precipitate and washing by centrifugation, followed by freeze-drying to obtain NiS/Ni3S4@PPy@MoS2 nanowires.
Further, a preparation method of the one-dimensional Ni nanowires may include the following steps: dissolving 1.2 g of the NaOH in 35 mL of the ethylene glycol, stirring for 1 h to obtain the solution, adding 10 mL of the hydrazine hydrate solution as the reducing agent to the solution, followed by continuous stirring for 0.5 h; placing the obtained mixed solution in the constant-temperature water bath at 80° C. with the external magnetic field, followed by adding 15 mL of the NiCl2.6H2O ethylene glycol solution dropwise with the syringe; and after standing for 5 min, collecting the Ni nanowires with the magnet, followed by washing 3 times with the absolute ethanol and the deionized water, and conducting freeze-drying at −60° C.
Further, the preparation method of the one-dimensional Ni nanowires may include the following steps: adding 15 mL of the NiCl2.6H2O ethylene glycol solution dropwise with the syringe; and after standing for 5 min, collecting the Ni nanowires with the magnet, followed by washing 3 times with the absolute ethanol and the deionized water, and conducting freeze-drying at −60° C.
Further, a preparation method of the one-dimensional Ni@PPy nanowires may include the following steps: dispersing 0.013 g of the SDBS and 0.1 mL of the pyrrole in 50 mL of the deionized water under sonication, and adding 0.05 g to 0.07 g of the Ni nanowires to the obtained mixture under the sonication; after mechanically stirring the mixture for 2 h, adding 5 mL of the FeCl3 aqueous solution; continuing to conduct aggregation for 2 h; and separating the precipitate with the magnet, followed by washing and freeze-drying at −60° C. to obtain the Ni@PPy nanowires.
Further, a preparation method of the one-dimensional coralloid NiS/Ni3S4@PPy@MoS2-based wave absorber may include the following steps: under ultrasonication, dissolving 0.04 g to 0.08 g of the Na2MoO4 and 0.08 g to 0.16 g of the thioacetamide in 20 mL of the deionized water, adding 0.04 g of the Ni@PPy nanowires, and mechanically stirring the obtained mixed solution continuously for 30 min; transferring the entire mixed solution to the autoclave for reaction at 200° C. for 12 h; and after the reaction is completed, separating the precipitate and washing by centrifugation, followed by freeze-drying at 60° C. to obtain the NiS/Ni3S4@PPy@MoS2 nanowires.
Further, the FeCl3 aqueous solution may have a concentration of 0.29 mol/L; and the NiCl2.6H2O ethylene glycol solution may have a concentration of 0.1 mol/L.
In the present disclosure, these parameters are obtained through continuous testing and optimization through experiments, where the addition of the SDBS and pyrrole may affect the layer thickness and final performance of the PPy; and the amount of thioacetamide and Na2MoO4 may affect the microscopic morphology of MoS2 and the final properties of the product. Experiments with the parameters in this scheme will result in an optimal PPy layer thickness and nanorod MoS2.
The present disclosure further provides a one-dimensional coralloid NiS/Ni3S4@PPy@MoS2-based wave absorber prepared by the preparation method of a one-dimensional coralloid NiS/Ni3S4@PPy@MoS2-based wave absorber. The wave absorber is a functional filler that absorbs electromagnetic waves through internal loss components (including a dielectric loss type and a resistive loss type). The wave absorber is a black powder in physical properties, and then a one-dimensional composite coralloid core-shell wave absorbing material in microscopic properties.
The present disclosure further provides a method for improving wireless communication using the one-dimensional coralloid NiS/Ni3S4@PPy@MoS2-based wave absorber.
The present disclosure further provides a method for improving communication between an aircraft and a base station using the one-dimensional coralloid NiS/Ni3S4@PPy@MoS2-based wave absorber.
Combined with all the above technical solutions, the present disclosure has the advantages and positive effects as follows: in the present disclosure, the one-dimensional Ni nanowires are prepared by a chemical reduction method, the Ni nanowires are externally coated with the PPy layer, and the MoS2 nanorods externally grow on the PPy layer. Meanwhile, Ni as a sacrificial template is vulcanized into NiS/Ni3S4 to prepare the one-dimensional coralloid NiS/Ni3S4@PPy@MoS2-based wave absorber. The wave absorber has a novel surface morphology and simple preparation process.
In the present disclosure, the one-dimensional Ni nanowires are prepared by the reduction method, with a simple process and low cost. The diameter and surface morphology of the Ni nanowires may be controlled by adjusting the amount of raw materials. Ni nanowires are coated with a layer of PPy by in-situ polymerization method using pyrrole as a monomer to obtain a core-shell structure Ni@PPy. The conductive polymer PPy has a one-dimensional structure, which may induce directional electron transport, thereby improving electrical energy dissipation and improving microwave loss capability. The one-dimensional Ni@PPy nanowires are coated with the MoS2 nanorods by a hydrothermal method. The MoS2 nanorods are coralloid as a whole and have a novel structure, which is different from the MoS2 nanosheets with a flower-like structure reported in other literatures. The coralloid surface intensifies the multiple reflection and scattering behaviors of incident electromagnetic waves, helping to prolong the transmission path of microwaves.
In the present disclosure, when the MoS2 nanorods are coated by the hydrothermal method, the Ni nanowires are sulfided by thioacetamide to prepare the NiS/Ni3S4 nanowires, thereby further improving the dielectric loss capability of the wave absorber. In addition, the one-dimensional NiS/Ni3S4 nanowires have a novel structure different from the spherical or non-obvious NiS/Ni3S4 structures reported in existing literatures. The preparation method has a simple process and a low cost in required raw materials. Moreover, the prepared wave absorber has relatively novel overall structure and combination of the raw materials, as well as excellent wave absorbing properties, thereby providing a new idea for design and preparation of one-dimensional wave absorbing materials. The nanorod MoS2 is prepared using a simple hydrothermal method, which is different from the template method and surfactant addition method in the prior art.
Illustrative embodiments of the present disclosure are described in detail below with reference to the attached drawing figures.
The following describes some non-limiting exemplary embodiments of the invention with reference to the accompanying drawings. The described embodiments are merely a part rather than all of the embodiments of the invention. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the disclosure shall fall within the scope of the disclosure.
the present disclosure provides a one-dimensional coralloid NiS/Ni3S4@PPy@MoS2-based wave absorber, and a preparation method and use thereof. The present disclosure will be described in detail below in conjunction with the accompanying drawings.
As shown in
S101: preparing one-dimensional Ni nanowires by a reduction method.
S102: coating a layer of PPy on the Ni nanowires by an in-situ polymerization method using pyrrole as a monomer, to obtain Ni@PPy nanowires.
S103: coating MoS2 nanorods on the Ni@PPy nanowires by a hydrothermal synthesis method.
For the preparation method of a one-dimensional coralloid NiS/Ni3S4@PPy@MoS2-based wave absorber provided by the present disclosure, those of ordinary skill in the art may also implement other steps. The preparation method of a one-dimensional coralloid NiS/Ni3S4@PPy@MoS2-based wave absorber shown in
The technical solutions of the present disclosure will be further described below in conjunction with some examples.
The present disclosure provides a preparation method of a one-dimensional coralloid NiS/Ni3S4@PPy@MoS2-based wave absorber. In this experiment, the one-dimensional Ni nanowires are prepared by reduction method, the Ni@PPy nanowires are coated with a layer of PPy by in-situ polymerization method using the pyrrole as a monomer, and the Ni@PPy nanowires are coated with a layer of MoS2 nanorods by hydrothermal synthesis method. Meanwhile, the Ni as a sacrificial template is vulcanized into NiS/Ni3S4 to obtain the one-dimensional coralloid NiS/Ni3S4@PPy@MoS2 wave absorber. The wave absorber has an excellent performance, novel structure and desirable prospect for use.
A preparation method of a one-dimensional coralloid NiS/Ni3S4@PPy@MoS2-based wave absorber included the following steps:
(1) Preparation of one-dimensional Ni nanowires: 1.2 g of NaOH was dissolved in 35 mL of ethylene glycol, followed by stirring for 1 h to obtain a solution, 10 mL of a hydrazine hydrate solution as a reducing agent was added to the solution, followed by stirring for 0.5 h to obtain a mixed solution. The mixed solution was placed in a constant-temperature water bath at 80° C. with an external magnetic field, followed by adding 15 mL of a NiCl2.6H2O ethylene glycol solution (0.1 mol/L) dropwise to the mixed solution with a syringe. After standing for 5 min, Ni nanowires were collected with a magnet, followed by washing 3 times with absolute ethanol and deionized water, and freeze-drying was conducted at −60° C.
(2) Preparation of one-dimensional Ni@PPy nanowires: 0.013 g of SDBS and 0.1 mL of pyrrole were dispersed in 50 mL of the deionized water under sonication, and 0.07 g of the Ni nanowires were added to a resulting mixture under the sonication. After mechanically stirring the mixture for 2 h, 5 mL of a FeCl3 aqueous solution (0.29 mol/L) was added, followed by continuing polymerization for another 2 h. A precipitate was separated with a magnet, followed by washing and freeze-drying at −60° C. to obtain the Ni@PPy nanowires.
(3) Preparation of a one-dimensional coralloid NiS/Ni3S4@PPy@MoS2 wave absorber: under ultrasonication, 0.04 g of Na2MoO4 and 0.08 g of thioacetamide were dissolved in 20 mL of the deionized water, 0.04 g of the Ni@PPy nanowires were added, and a resulting mixed solution was continuously and mechanically stirred for 30 min. The entire mixed solution was transferred to an autoclave for reaction at 200° C. for 12 h. After the reaction was completed, a precipitate was separated and washed by centrifugation, followed by freeze-drying at −60° C. to obtain NiS/Ni3S4@PPy@MoS2 nanowires.
A preparation method of a one-dimensional coralloid NiS/Ni3S4@PPy@MoS2-based wave absorber included the following steps:
(1) Preparation of one-dimensional Ni nanowires: 1.2 g of NaOH was dissolved in 35 mL of ethylene glycol, followed by stirring for 1 h to obtain a solution, 10 mL of a hydrazine hydrate solution as a reducing agent was added to the solution, followed by stirring for 0.5 h to obtain a mixed solution. The mixed solution was placed in a constant-temperature water bath at 80° C. with an external magnetic field, followed by adding 15 mL of a NiCl2.6H2O ethylene glycol solution (0.1 mol/L) dropwise to the mixed solution with a syringe. After standing for 5 min, Ni nanowires were collected with a magnet, followed by washing 3 times with absolute ethanol and deionized water, and freeze-drying was conducted at −60° C.
(2) Preparation of one-dimensional Ni@PPy nanowires: 0.013 g of SDBS and 0.1 mL of pyrrole were dispersed in 50 mL of the deionized water under sonication, and 0.06 g of the Ni nanowires were added to a resulting mixture under the sonication. After mechanically stirring the mixture for 2 h, 5 mL of a FeCl3 aqueous solution (0.29 mol/L) was added, followed by continuing polymerization for another 2 h. A precipitate was separated with a magnet, followed by washing and freeze-drying at −60° C. to obtain the Ni@PPy nanowires.
(3) Preparation of a one-dimensional coralloid NiS/Ni3S4@PPy@MoS2 wave absorber: under ultrasonication, 0.04 g of Na2MoO4 and 0.08 g of thioacetamide were dissolved in 20 mL of the deionized water, 0.04 g of the Ni@PPy nanowires were added, and a resulting mixed solution was continuously and mechanically stirred for 30 min. The entire mixed solution was transferred to an autoclave for reaction at 200° C. for 12 h. After the reaction was completed, a precipitate was separated and washed by centrifugation, followed by freeze-drying at −60° C. to obtain NiS/Ni3S4@PPy@MoS2 nanowires.
A preparation method of a one-dimensional coralloid NiS/Ni3S4@PPy@MoS2-based wave absorber included the following steps:
(1) Preparation of one-dimensional Ni nanowires: 1.2 g of NaOH was dissolved in 35 mL of ethylene glycol, followed by stirring for 1 h to obtain a solution, 10 mL of a hydrazine hydrate solution as a reducing agent was added to the solution, followed by stirring for 0.5 h to obtain a mixed solution. The mixed solution was placed in a constant-temperature water bath at 80° C. with an external magnetic field, followed by adding 15 mL of a NiCl2.6H2O ethylene glycol solution (0.1 mol/L) dropwise to the mixed solution with a syringe. After standing for 5 min, Ni nanowires were collected with a magnet, followed by washing 3 times with absolute ethanol and deionized water, and freeze-drying was conducted at −60° C.
(2) Preparation of one-dimensional Ni@PPy nanowires: 0.013 g of SDBS and 0.1 mL of pyrrole were dispersed in 50 mL of the deionized water under sonication, and 0.05 g of the Ni nanowires were added to a resulting mixture under the sonication. After mechanically stirring the mixture for 2 h, 5 mL of a FeCl3 aqueous solution (0.29 mol/L) was added, followed by continuing polymerization for another 2 h. A precipitate was separated with a magnet, followed by washing and freeze-drying at −60° C. to obtain the Ni@PPy nanowires.
(3) Preparation of a one-dimensional coralloid NiS/Ni3S4@PPy@MoS2 wave absorber: under ultrasonication, 0.04 g of Na2MoO4 and 0.08 g of thioacetamide were dissolved in 20 mL of the deionized water, 0.04 g of the Ni@PPy nanowires were added, and a resulting mixed solution was continuously and mechanically stirred for 30 min. The entire mixed solution was transferred to an autoclave for reaction at 200° C. for 12 h. After the reaction was completed, a precipitate was separated and washed by centrifugation, followed by freeze-drying at −60° C. to obtain NiS/Ni3S4@PPy@MoS2 nanowires.
A preparation method of a one-dimensional coralloid NiS/Ni3S4@PPy@MoS2-based wave absorber included the following steps:
(1) Preparation of one-dimensional Ni nanowires: 1.2 g of NaOH was dissolved in 35 mL of ethylene glycol, followed by stirring for 1 h to obtain a solution, 10 mL of a hydrazine hydrate solution as a reducing agent was added to the solution, followed by stirring for 0.5 h to obtain a mixed solution. The mixed solution was placed in a constant-temperature water bath at 80° C. with an external magnetic field, followed by adding 15 mL of a NiCl2.6H2O ethylene glycol solution (0.1 mol/L) dropwise to the mixed solution with a syringe. After standing for 5 min, Ni nanowires were collected with a magnet, followed by washing 3 times with absolute ethanol and deionized water, and freeze-drying was conducted at −60° C.
(2) Preparation of one-dimensional Ni@PPy nanowires: 0.013 g of SDBS and 0.1 mL of pyrrole were dispersed in 50 mL of the deionized water under sonication, and 0.05 g of the Ni nanowires were added to a resulting mixture under the sonication. After mechanically stirring the mixture for 2 h, 5 mL of a FeCl3 aqueous solution (0.29 mol/L/L) was added, followed by continuing polymerization for another 2 h. A precipitate was separated with a magnet, followed by washing and freeze-drying at −60° C. to obtain the Ni@PPy nanowires.
(3) Preparation of a one-dimensional coralloid NiS/Ni3S4@PPy@MoS2 wave absorber: under ultrasonication, 0.06 g of Na2MoO4 and 0.12 g of thioacetamide were dissolved in 20 mL of the deionized water, 0.04 g of the Ni@PPy nanowires were added, and a resulting mixed solution was continuously and mechanically stirred for 30 min. The entire mixed solution was transferred to an autoclave for reaction at 200° C. for 12 h. After the reaction was completed, a precipitate was separated and washed by centrifugation, followed by freeze-drying at −60° C. to obtain NiS/Ni3S4@PPy@MoS2 nanowires.
A preparation method of a one-dimensional coralloid NiS/Ni3S4@PPy@MoS2-based wave absorber included the following steps:
(1) Preparation of one-dimensional Ni nanowires: 1.2 g of NaOH was dissolved in 35 mL of ethylene glycol, followed by stirring for 1 h to obtain a solution, 10 mL of a hydrazine hydrate solution as a reducing agent was added to the solution, followed by stirring for 0.5 h to obtain a mixed solution. The mixed solution was placed in a constant-temperature water bath at 80° C. with an external magnetic field, followed by adding 15 mL of a NiCl2.6H2O ethylene glycol solution (0.1 mol/L) dropwise to the mixed solution with a syringe. After standing for 5 min, Ni nanowires were collected with a magnet, followed by washing 3 times with absolute ethanol and deionized water, and freeze-drying was conducted at −60° C.
(2) Preparation of one-dimensional Ni@PPy nanowires: 0.013 g of SDBS and 0.1 mL of pyrrole were dispersed in 50 mL of the deionized water under sonication, and 0.05 g of the Ni nanowires were added to a resulting mixture under the sonication. After mechanically stirring the mixture for 2 h, 5 mL of a FeCl3 aqueous solution (0.29 mol/L) was added, followed by continuing polymerization for another 2 h. A precipitate was separated with a magnet, followed by washing and freeze-drying at −60° C. to obtain the Ni@PPy nanowires.
(3) Preparation of a one-dimensional coralloid NiS/Ni3S4@PPy@MoS2 wave absorber: under ultrasonication, 0.08 g of Na2MoO4 and 0.16 g of thioacetamide were dissolved in 20 mL of the deionized water, 0.04 g of the Ni@PPy nanowires were added, and a resulting mixed solution was continuously and mechanically stirred for 30 min. The entire mixed solution was transferred to an autoclave for reaction at 200° C. for 12 h. After the reaction was completed, a precipitate was separated and washed by centrifugation, followed by freeze-drying at −60° C. to obtain NiS/Ni3S4@PPy@MoS2 nanowires.
A preparation method of a one-dimensional coralloid NiS/Ni3S4@PPy@MoS2-based wave absorber included the following steps:
(1) Preparation of one-dimensional Ni nanowires: 1.2 g of NaOH was dissolved in 35 mL of ethylene glycol, followed by stirring for 1 h to obtain a solution, 10 mL of a hydrazine hydrate solution as a reducing agent was added to the solution, followed by stirring for 0.5 h to obtain a mixed solution. The mixed solution was placed in a constant-temperature water bath at 80° C. with an external magnetic field, followed by adding 15 mL of a NiCl2.6H2O ethylene glycol solution (0.1 mol/L) dropwise to the mixed solution with a syringe. After standing for 5 min, Ni nanowires were collected with a magnet, followed by washing 3 times with absolute ethanol and deionized water, and freeze-drying was conducted at −60° C.
(2) Preparation of one-dimensional Ni@PPy nanowires: 0.013 g of SDBS and 0.1 mL of pyrrole were dispersed in 50 mL of the deionized water under sonication, and 0.05 g of the Ni nanowires were added to a resulting mixture under the sonication. After mechanically stirring the mixture for 2 h, 5 mL of a FeCl3 aqueous solution (0.29 mol/L) was added, followed by continuing polymerization for another 2 h. A precipitate was separated with a magnet, followed by washing and freeze-drying at −60° C. to obtain the Ni@PPy nanowires.
(3) Preparation of a one-dimensional coralloid NiS/Ni3S4@PPy@MoS2 wave absorber: under ultrasonication, 0.1 g of ammonium molybdate and 0.2 g of thiourea were dissolved in 20 mL of the deionized water, 0.04 g of the Ni@PPy nanowires were added, and a resulting mixed solution was continuously and mechanically stirred for 30 min. The entire mixed solution was transferred to an autoclave for reaction at 200° C. for 12 h. After the reaction was completed, a precipitate was separated and washed by centrifugation, followed by freeze-drying at −60° C. to obtain NiS/Ni3S4@PPy@MoS2 nanowires.
The technical effects of the disclosure will be described in detail below in conjunction with the accompanying drawings.
In the present disclosure, the electromagnetic parameters and wave-absorbing properties of the coralloid NiS/Ni3S4@PPy@MoS2 samples with different doping (30%, 40% and 50%) prepared in Example 1 were analyzed using a vector network analyzer, and the results were shown in
The foregoing are merely descriptions of the specific embodiments of the present disclosure, and the protection scope of the present disclosure is not limited thereto. Any modification, equivalent replacement, improvement, etc. made within the technical scope of the present disclosure by a person skilled in the art according to the spirit and principle of the present disclosure shall fall within the protection scope of the present disclosure.
Many different arrangements of the various components depicted, as well as components not shown, are possible without departing from the spirit and scope of the present disclosure. Embodiments of the present disclosure have been described with the intent to be illustrative rather than restrictive. Alternative embodiments will become apparent to those skilled in the art that do not depart from its scope. A skilled artisan may develop alternative means of implementing the aforementioned improvements without departing from the scope of the present disclosure.
It will be understood that certain features and subcombinations are of utility and may be employed without reference to other features and subcombinations and are contemplated within the scope of the claims. Unless indicated otherwise, not all steps listed in the various figures need be carried out in the specific order described.
| Number | Date | Country | Kind |
|---|---|---|---|
| 202110282222.7 | Mar 2021 | CN | national |
