A modified two-dimensional material film and a preparation method and applications thereof

Abstract

The application relates to a modified two-dimensional material film and a preparation method and application, comprising a two-dimensional material film, the two-dimensional material film is subjected to electron beam irradiation; the irradiation dose of the electron beam irradiation is 5 kGy; the preparation steps of the two-dimensional material film are as follows: a solution of two-dimensional material powder is ultrasonically dispersed, the supernatant colloid with single-layer two-dimensional material lamella in the upper layer is taken as experimental material; the colloid solution is added into deionized water to dilute the solution concentration, and a glass rod is used to stir and uniformly mix; a polyether sulfone film with a pore size of 0.2 mu m and a diameter of 50 mm is used as a base film, the base film is placed on a vacuum filtration device, the diluted colloid solution is poured into the vacuum filtration device, water is pumped away through the vacuum filtration device, and the two-dimensional material is deposited on the base film to obtain a two-dimensional material film. The electron beam irradiation technology is a stable and convenient modification method, has good irradiation effect on the two-dimensional material, and according to different irradiation times, the two-dimensional film material with different strong and weak inductive effects is obtained.

Description

Technical Field

[0001] This invention pertains to methods for modifying electronic materials, specifically relating to a method for preparing two-dimensional material films using electron beam irradiation technology and its applications. Background Technology

[0002] When a two-dimensional material is placed in an aqueous solution of pure water on one side and KCl on the other, it exhibits an inductive effect due to the diffusion of ions within the material. This phenomenon has been reported in numerous publications (Zhang YJ, ChemElectroChem, 2020, 7, 493; Chen H, ACS Applied Electronic Materials, 2021, 3, 4509; Chen Z, Applied ClayScience, 2021, 203, 106002; Invention Patent CN111266020B). This inductive effect can be applied to applications such as biochips and water environment monitoring, to hysteresis alternating electric fields.

[0003] Because two-dimensional sheet materials (such as GO, MXene, montmorillonite, etc.) have negatively charged surfaces, they adsorb cations and repel anions, resulting in uneven distribution of cations and anions within the membrane. Under alternating current, a built-in electric field is generated, thus producing an inductive effect. Furthermore, MXene has ion-sieving capabilities, selectively allowing the passage of cations with different valence states. Different electrolyte solutions lead to different inductive effects in the MXene membrane; therefore, the inductance can be controlled by observing the transport behavior of ions within the two-dimensional material. Currently reported methods for controlling the inductance of two-dimensional materials involve adding functional groups between the two-dimensional sheets (invention patent CN114381023A). This method is a hydrothermal reaction and yields good results for small sample processing, but it is not suitable for large-scale production. Summary of the Invention

[0004] To achieve the above objectives, the present invention provides a two-dimensional material film modified by electron beam irradiation and a preparation method for mass production.

[0005] Another objective of this invention is the application of two-dimensional material films in the inductive effect.

[0006] A method for preparing a modified two-dimensional material film, comprising a two-dimensional material film, characterized in that the two-dimensional material film is irradiated with an electron beam.

[0007] Preferably, the irradiation dose of the electron beam irradiation is 5 kGy.

[0008] Furthermore, the preparation steps of the above-mentioned two-dimensional material film are as follows:

[0009] The solution of two-dimensional material powder was ultrasonically dispersed, and the supernatant colloid with a single layer of two-dimensional material sheets was taken as the experimental material. The colloidal solution was diluted with deionized water and stirred with a glass rod to make it uniformly mixed.

[0010] A polyethersulfone membrane with a pore size of 0.2 μm and a diameter of 50 mm was used as the substrate membrane. The substrate membrane was placed on a vacuum filtration device, and a diluted colloidal solution was poured in. The water was removed by the vacuum filtration device, causing the two-dimensional material to be deposited on the substrate membrane, thus obtaining a two-dimensional material membrane.

[0011] Furthermore, the solution of the above-mentioned two-dimensional material powder is a GO, MXene, or montmorillonite solution.

[0012] Two-dimensional material films obtained by any of the above preparation methods.

[0013] The above-mentioned two-dimensional material films are used in the inductive effect.

[0014] Beneficial effects: Electron beam irradiation technology is a stable and convenient modification method that has a good irradiation effect on two-dimensional materials. Depending on the irradiation time, two-dimensional film materials with different strengths and weaknesses of inductive effect can be obtained. Attached Figure Description

[0015] Figure 1 This invention relates to an electron beam irradiation technology-controlled two-dimensional material testing device;

[0016] Figure 2 yes Figure 1 Equivalent circuit:

[0017] Figure 3 Scanning electron microscope images of the GO membrane surface (left) without irradiation, (right) irradiated with a dose of 5 kGy;

[0018] Wherein, 1-auxiliary electrode; 2-reference electrode; 3-aqueous solution; 4-branched deionized water; 5-membrane;

[0019] Re is the resistance in the aqueous solution, C is the capacitance of the membrane material itself, Rm is the resistance of the aqueous solution passing through the membrane material, L is the inductance, and R... L A resistor connected in series with an inductor. Detailed Implementation

[0020] The present invention will be further described in conjunction with specific embodiments:

[0021] The following is a technical solution for the preparation and testing of two-dimensional material films with inductive properties:

[0022] 1. The solution of two-dimensional material powder (GO, MXene or montmorillonite) is ultrasonically dispersed, and the supernatant colloid with a single layer of two-dimensional material sheets is taken as the experimental material.

[0023] 2. Add the colloidal solution to 500ml of deionized water to dilute the solution concentration, and stir with a glass rod to mix it evenly;

[0024] 3. Using a polyethersulfone membrane with a pore size of 0.2μm and a diameter of 50mm as the base membrane, the base membrane is placed on a vacuum filtration device, and a diluted colloidal solution is poured in. The water is removed by the vacuum filtration device, causing the two-dimensional material to be deposited on the base membrane, thus obtaining a two-dimensional material membrane.

[0025] 4. The two-dimensional material is placed in the sample chamber and irradiated with an electron beam for different times to obtain the irradiated sample.

[0026] 5. Impedance testing of the irradiated membrane material was performed using a four-electrode system. 0.01 mol / L NaCl aqueous solution was added to one side of the membrane cell, and an equal amount of deionized water was added to the other side. The response signal of the two-dimensional membrane material under the action of an alternating electric field under the transmembrane concentration difference was measured using an electrochemical workstation.

[0027] Example 1:

[0028] 0.4 ml of a 5 mg / ml GO solution was added to 300 ml of deionized water and stirred thoroughly with a glass rod. The mixture was then vacuum filtered for 2 hours to form a GO membrane, which was allowed to dry naturally at room temperature for 24 hours. The GO membrane was then irradiated with an electron beam at a dose of 5 kGy. A 0.01 mol / L NaCl solution was added to one side of the membrane cell, and an equal volume of deionized water was added to the other side. Unirradiated and irradiated GO membranes were placed in the middle of the cell, respectively. The inductance effect under the transmembrane concentration gradient is shown in Table 1.

[0029] Table 1. Effect of irradiation on the inductive effect of GO film.

[0030]

[0031]

[0032] The irradiated GO film exhibits a significantly enhanced inductive effect, with a marked increase in duration.

[0033] Figure 3 Scanning electron microscope images of the GO membrane surface (left) without irradiation, (right) irradiated with a dose of 5 kGy

[0034] Example 2:

[0035] 0.4 ml of a 5 mg / ml MXene solution was added to 300 ml of deionized water and stirred thoroughly with a glass rod. The mixture was then vacuum filtered for 2 hours to form an MXene membrane, which was allowed to dry naturally at room temperature for 24 hours. The MXene membrane was then irradiated with an electron beam to a cumulative dose of 5 kGy. A 0.01 mol / L NaCl solution was added to one side of the membrane cell, and an equal volume of deionized water was added to the other side. Unirradiated and irradiated MXene membranes were placed in the middle of the cell, respectively. The inductance was measured under the transmembrane concentration gradient, as shown in Table 2.

[0036] Table 2 Effect of irradiation on the inductive effect of MXene film

[0037]

[0038]

[0039] The irradiated MXene film exhibits a significantly enhanced inductive effect, with a marked increase in duration.

Claims

1. A method for preparing a modified two-dimensional material film, characterized in that, The preparation steps include the following: The solution of two-dimensional material powder was ultrasonically dispersed, and the supernatant colloid with a single layer of two-dimensional material sheets was taken as the experimental material. The supernatant colloid was added to deionized water to dilute the solution concentration, and stirred with a glass rod to mix it evenly, thus obtaining the diluted colloidal solution. A polyethersulfone membrane with a pore size of 0.2 μm and a diameter of 50 mm was used as the base membrane. The base membrane was placed on a vacuum filtration device, and the diluted colloidal solution was poured in. The water was removed by the vacuum filtration device, and the two-dimensional material was deposited on the base membrane to obtain a two-dimensional material membrane. A modified two-dimensional material film was obtained by irradiating a two-dimensional material film with an electron beam. The electron beam irradiation dose is 5 kGy; The solution of the two-dimensional material powder is a GO or Mxene solution.

2. The two-dimensional material film obtained by the preparation method as described in claim 1.

3. The application of the two-dimensional material film as described in claim 2 in the inductive effect.

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