CN111372435A - MXene-based high-thermal-conductivity fireproof electromagnetic shielding composite film and preparation method thereof - Google Patents
MXene-based high-thermal-conductivity fireproof electromagnetic shielding composite film and preparation method thereof Download PDFInfo
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Abstract
The invention relates to the field of composite films, in particular to an MXene-based high-heat-conductivity fireproof electromagnetic shielding composite film and a preparation method thereof; the preparation method of the MXene-based high-thermal-conductivity fireproof electromagnetic shielding composite film comprises the following steps of: mixing the MXene solution and the two-dimensional filler solution, stirring and then performing ultrasonic treatment to prepare a mixed solution; and then, pouring the mixed solution into a filter flask with a filter membrane for suction filtration to obtain the MXene-based composite film. The heat conductivity coefficient of the MXene-based composite film prepared by the method is as high as 67.3W/(m.K); moreover, the MXene-based composite film has electromagnetic shielding performance up to 73dB under the thickness of 25 μm; the MXene-based composite film has excellent heat conduction, fire resistance, electromagnetic shielding and thermal stability, and has huge application potential and market value in the fields of wearable electronic equipment and the like.
Description
Technical Field
The invention relates to the field of composite films, in particular to an MXene-based high-heat-conductivity fireproof electromagnetic shielding composite film and a preparation method thereof.
Background
With the rapid development of electronic equipment towards miniaturization and high frequency, electromagnetic wave radiation generated by electronic components in the operation process is increasingly serious, which not only influences the normal operation of the electronic equipment, but also causes great harm to the physical and mental health of human beings. In order to effectively shield electromagnetic interference, it is very urgent to prepare a material having excellent electromagnetic shielding properties. Meanwhile, the high integration of the electronic equipment enables the electronic elements to generate a large amount of heat in the operation process, so that the heat of the electronic equipment is continuously accumulated, serious heating phenomena are generated, and even serious disasters such as explosion, fire and the like can be caused.
At present, materials having both heat conduction and electromagnetic shielding properties are mainly conductive metal materials and polymer matrix composite materials. Although pure metals such as copper, nickel, etc. have good electrical and thermal conductivity, their application in thermal and electromagnetic shielding materials is limited due to their defects of high density, susceptibility to corrosion, and high rigidity. In addition, polymer-based composites also have limited applications in thermal conduction and electromagnetic shielding due to their flammability, intrinsic electrical/thermal insulation of the polymer, and other drawbacks.
The two-dimensional transition metal carbon/nitride, MXene, is a novel two-dimensional nanomaterial discovered by professor Yury Gogotsi of Dr. Ressel university, USA; the chemical formula can be represented by Mn+1XnTzWherein M denotes a transition metal (Sc, Ti, Zr, Hf,v, Nb, Ta, Cr, Mo, etc.), X denotes C or/and N, N is equal to 1, 2 or 3, TzRefers to a surface group (═ O, -OH, -F). MXene has ultrahigh conductivity, abundant surface groups and adjustable microscopic size, and has great potential in the fields of electromagnetic shielding, energy storage, adsorption and the like. In addition, MXene has excellent heat conducting performance (472W/(m.K)), and is an ideal choice for preparing heat-conducting fireproof electromagnetic shielding materials. However, the heat-conducting property of MXene is only limited by theoretical calculation, and a research report of a macroscopic MXene-based heat-conducting fireproof electromagnetic shielding material is still lacked.
Therefore, it is very important to develop an electromagnetic shielding material having both high thermal conductivity and fire-proof property.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides an MXene-based high-heat-conductivity fireproof electromagnetic shielding composite film and a preparation method thereof.
(II) technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme:
a preparation method of an MXene-based high-thermal-conductivity fireproof electromagnetic shielding composite film comprises the following steps: mixing the MXene solution and the two-dimensional filler solution, stirring and then performing ultrasonic treatment to prepare a mixed solution; and then, pouring the mixed solution into a filter flask with a filter membrane for suction filtration to obtain the MXene-based composite film.
Preferably, in the mixed solution, the mass ratio of MXene to the two-dimensional filler is 1-20: 0.01.
preferably, the MXene solution is prepared by the following steps:
adding LiF into an HCl solution, and stirring until the LiF is completely dissolved to prepare an etching solution; mixing Ti3AlC2Adding into the etching solution, stirring, and etching off Ti3AlC2After Al atom in the solution, Ti is obtained3C2Mixed acid solution of(ii) a Washing the mixed acid solution with deionized water, centrifuging until the pH value is more than 6, removing supernatant to obtain multiple layers of MXene precipitates, adding deionized water, oscillating and centrifuging, and collecting supernatant to obtain single-layer or few-layer MXene solution; the concentration of MXene solution is 0.1-15 mg/mL.
Preferably, the two-dimensional filler is one or More of Montmorillonite (MMT), Boron Nitride (BN), Graphene Oxide (GO), and reduced graphene oxide (rGO); the concentration of the two-dimensional filler solution is 0.1-15 mg/mL.
Preferably, the thickness of the MXene-based composite film is 5-200 μm; the maximum electromagnetic shielding effectiveness of the MXene-based composite film is more than or equal to 73 dB; the maximum thermal conductivity of the MXene-based composite film is more than or equal to 67.3W/(m.K).
Preferably, the two-dimensional filler is MMT and the MMT solution is prepared by: and (3) putting the MMT into deionized water, sequentially carrying out ultrasonic treatment, stirring and centrifugation, and finally collecting supernatant to prepare the MMT solution.
Preferably, the two-dimensional filler is BN, and the preparation process of the BN solution is as follows: placing BN powder into isopropanol solution, performing ultrasonic treatment and then centrifuging, collecting supernatant, and performing ultrasonic treatment to obtain stripped BN solution; wherein the isopropanol solution consists of 50% isopropanol and 50% deionized water.
Preferably, the two-dimensional filler is GO, and the preparation process of the GO solution is as follows: mixing graphite flake with KMnO4Placing the mixture into a beaker, slowly adding mixed acid prepared from concentrated sulfuric acid and concentrated phosphoric acid into the beaker, and stirring the mixture at the lower side of room temperature; then, dropwise adding hydrogen peroxide into the beaker in an ice-water bath until no bubbles are generated, clarifying the reaction solution, pouring out the supernatant, washing with hydrochloric acid, and washing the precipitate with deionized water until the precipitate is neutral; and finally, centrifuging the reaction solution after ultrasonic treatment to obtain a supernatant, namely the few-layer or single-layer GO solution.
Preferably, the two-dimensional filler is rGO, and the process of the MXene-based composite film is as follows: and mixing the GO solution prepared by the process with the MXene solution to prepare an MXene/GO composite film, then placing the MXene/GO composite film in hydroiodic acid for in-situ reduction for 1h, washing and drying by using ethanol and deionized water to prepare the MXene/rGO composite film subjected to in-situ reduction.
An MXene-based high-thermal-conductivity fireproof electromagnetic shielding composite film is prepared by the preparation method.
Compared with the prior art, the invention has the following advantages:
the preparation method provided by the invention has the advantages of stable reaction, safety and convenience, and good uniformity of the prepared product; the heat conductivity coefficient of the MXene-based composite film prepared by the method is as high as 67.3W/(m.K); moreover, the MXene-based composite film has electromagnetic shielding performance up to 73dB under the thickness of 25 μm; the preparation method has the advantages of wide raw material source, simple and easy operation, and can be used in large-scale application and is beneficial to popularization.
Drawings
FIG. 1 is a transmission electron microscope photograph of MXene solution in example 1 of the present invention;
FIG. 2 is a transmission electron microscope photograph of an MMT solution in example 1 of the present invention;
FIG. 3 is a scanning electron microscope image of the cross section of the MXene-based composite film obtained in example 1 of the present invention;
FIG. 4 is a diagram showing a combustion state of an MXene-based composite film obtained in example 2 of the present invention;
fig. 5 is a graph of electromagnetic shielding effectiveness of the MXene-based composite film prepared in example 2 of the present invention after burning for 30 seconds.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A preparation method of an MXene-based high-thermal-conductivity fireproof electromagnetic shielding composite film comprises the following steps:
(1) preparing MXene solution: 5g LiF is added into 100mL 12mol/L HCl solution and stirred for 30min until completely dissolvedPreparing etching liquid; mixing 5g of Ti3AlC2Adding into the etching solution, stirring at 35 deg.C for 24 hr to etch off Ti3AlC2After Al atom in the solution, Ti is obtained3C2The mixed acid solution of (4); washing the mixed acid solution with deionized water, centrifuging at 3500rpm for 5min until the pH value is more than 6, pouring out the supernatant to obtain a multilayer MXene precipitate, adding 200mL of deionized water, shaking by hand for 7min, centrifuging at 3500rpm for 5min, collecting the supernatant to obtain a monolayer or few-layer MXene solution; wherein MXene is Ti3C2；
(2) Preparing a montmorillonite (MMT) solution: 3g of MMT is taken and dispersed in deionized water, and the mixture is subjected to ultrasonic treatment for 2 hours and then continuously stirred for 72 hours; centrifuging the dispersed solution at the rotating speed of 4000rpm for 1h, and collecting supernatant to obtain a MMT solution of 3 mg/mL;
(3) preparing an MXene/MMT composite film: mixing and stirring the prepared MXene with 3mg/mL and MMT solution with 2mg/mL for 20min, and performing ultrasonic treatment at 5-23 ℃ for 20min to obtain a mixture of MXene and MMT with the mass ratio of 19: 1; pouring the mixed solution into a filter flask with a cellulose acetate filter membrane, and preparing the MXene/MMT composite film with the thickness of 25 mu m by a vacuum-assisted suction filtration method.
Example 2
A preparation method of an MXene-based high-thermal-conductivity fireproof electromagnetic shielding composite film comprises the following steps:
referring to example 1, respectively preparing 10mg/mL MXene solution and 1mg/mL MMT solution, mixing and stirring the MXene solution and the MMT solution for 20min, and performing ultrasonic treatment at 5-23 ℃ for 20min to obtain MXene and MMT with the mass ratio of 9: 1; pouring the mixed solution into a filter flask with a cellulose acetate filter membrane, and preparing the MXene/MMT composite film with the thickness of 23 mu m by a vacuum-assisted suction filtration method.
Example 3
A preparation method of an MXene-based high-thermal-conductivity fireproof electromagnetic shielding composite film comprises the following steps:
referring to example 1, 0.5mg/mL MXene solution and 4mg/mL MMT solution are respectively prepared, mixed and stirred for 20min, and subjected to ultrasonic treatment at 5-23 ℃ for 20min to obtain a mixture of MXene and MMT with a mass ratio of 4: 1; pouring the mixed solution into a filter flask with a cellulose acetate filter membrane, and preparing the MXene/MMT composite film with the thickness of 30 mu m by a vacuum-assisted suction filtration method.
Example 4
A preparation method of an MXene-based high-thermal-conductivity fireproof electromagnetic shielding composite film comprises the following steps:
referring to example 1, 1mg/mL MXene solution and 10mg/mL MMT solution are respectively prepared, the MXene solution and the MMT solution are mixed and stirred for 20min, and the mixture is subjected to ultrasonic treatment at 5-23 ℃ for 20min to obtain MXene and MMT with the mass ratio of 7: 3, a mixed solution; pouring the mixed solution into a filter flask with a cellulose acetate filter membrane, and preparing the MXene/MMT composite film with the thickness of 33 mu m by a vacuum-assisted suction filtration method.
Example 5
A preparation method of an MXene-based high-thermal-conductivity fireproof electromagnetic shielding composite film comprises the following steps:
referring to example 1, 15mg/mL MXene solution and 7.5mg/mL MMT solution are respectively prepared, mixed and stirred for 20min, and subjected to ultrasonic treatment at 5-23 ℃ for 20min to obtain MXene and MMT with the mass ratio of 1: 1; pouring the mixed solution into a filter flask with a cellulose acetate filter membrane, and preparing the MXene/MMT composite film with the thickness of 45 mu m by a vacuum-assisted suction filtration method.
Example 6
A preparation method of an MXene-based high-thermal-conductivity fireproof electromagnetic shielding composite film comprises the following steps:
(1) preparation of Graphene Oxide (GO), 3g graphite flake and 18g KMnO4Placing in a beaker; preparing a mixed acid from 360mL of 98% concentrated sulfuric acid and 40mL of 85% concentrated phosphoric acid, slowly adding the mixed acid into a beaker through a glass rod for drainage, stirring the mixed acid under the room temperature, and reacting the mixed acid for 12 hours at 50 ℃; then, dropwise adding hydrogen peroxide into the beaker in an ice-water bath until no bubbles are generated, clarifying the reaction solution, and pouring out the supernatant; firstly, washing with about 9% hydrochloric acid, and then washing the precipitate with deionized water until the reaction solution is neutral; finally, after the reaction solution is subjected to ultrasonic treatment for 0.5-1 h, centrifuging the reaction solution for 30min at the rotating speed of 5000rpm, and obtaining the supernatantA few or single layer GO solution;
(2) preparing an MXene/GO composite film: referring to example 1, respectively preparing 5mg/mL MXene solution and 15mg/mL GO solution, mixing and stirring the MXene solution and the GO solution for 20min, and performing ultrasonic treatment at 5-23 ℃ for 20min to obtain MXene and GO with a mass ratio of 9: 1, pouring the mixed solution into a filter flask with a cellulose acetate filter membrane, and preparing the MXene/GO composite film with the thickness of 51 mu m by a vacuum-assisted suction filtration method.
Example 7
A preparation method of an MXene-based high-thermal-conductivity fireproof electromagnetic shielding composite film comprises the following steps:
(1) preparation of Boron Nitride (BN): 3.5g of BN powder was added to 200mL of an isopropanol solution (isopropanol: deionized water ═ 1: 1); ultrasonically treating the mixed solution for 4h, centrifuging at the rotating speed of 4000rpm for 10min to remove the non-peeled BN, collecting supernatant, and ultrasonically treating at 9000rpm for 30min to obtain a peeled BN solution;
(2) preparing an MXene/BN composite film: referring to example 1, 6mg/mL MXene solution and 3mg/mL BN solution were prepared; mixing and stirring the MXene solution and the boron nitride solution for 20min, and performing ultrasonic treatment at 5-23 ℃ for 20min to obtain MXene and BN with the mass ratio of 9: 1, pouring the mixed solution into a filter flask with a cellulose acetate filter membrane, and preparing the MXene/BN composite film with the thickness of 16 mu m by a vacuum-assisted suction filtration method.
Example 8
A preparation method of a high-thermal-conductivity MXene-based electromagnetic shielding composite film comprises the following steps:
(1) preparing GO: taking 3g of graphite flake and 18g of KMnO4Placing in a beaker; preparing a mixed acid from 360mL of 98% concentrated sulfuric acid and 40mL of 85% concentrated phosphoric acid, slowly adding the mixed acid into a beaker through a glass rod for drainage, stirring the mixed acid under the room temperature, and reacting the mixed acid for 12 hours at 50 ℃; then, dropwise adding hydrogen peroxide in an ice-water bath until no bubbles are generated, clarifying the reaction solution, and pouring out the supernatant; washing the yellow precipitate with about 9% hydrochloric acid, and washing the precipitate with deionized water until the reaction solution is neutral; finally, after the reaction solution is subjected to ultrasonic treatment for 0.5-1 h, centrifuging the reaction solution for 30min at the rotating speed of 5000rpm to obtain supernatantThe liquid is less or single layer GO;
(2) preparing an MXene/rGO composite film: referring to example 1, preparing 7mg/mL MXene solution and 14mg/mL GO solution respectively, mixing and stirring the MXene solution and the GO solution for 20min, and performing ultrasonic treatment at 5-23 ℃ for 20min to obtain MXene and GO with a mass ratio of 9: 1, pouring the mixed solution into a filter flask with a cellulose acetate filter membrane, preparing an MXene/GO composite film by a vacuum-assisted suction filtration method, then placing the prepared MXene/GO composite film into hydroiodic acid for reduction for 1h, and finally washing and drying by deionized water and ethanol to prepare the MXene/rGO composite film with the thickness of 62 microns.
Comparative example
A preparation method of MXene film comprises the following steps:
referring to example 1, 3mg/mL MXene solution is prepared, stirred for 20min, then subjected to ultrasonic treatment at 5-23 ℃ for 20min, poured into a filter flask with a cellulose acetate filter membrane, and subjected to vacuum assisted suction filtration to obtain an MXene membrane with the thickness of 25 μm.
Results and analysis
(1) Analysis of electron microscope results
As shown in fig. 1, MXene nanoplatelets prepared in example 1 are transparent and have a lateral dimension of about 2 μm, indicating successful exfoliation to produce a monolayer or few layers of MXene; as shown in fig. 2, the MMT nanoplatelets prepared in example 1 were transparent and had a lateral dimension of approximately 0.4 μm, indicating successful exfoliation to produce a single or few layers of MMT.
As shown in fig. 3, the MXene-based composite film has a very good layered structure and is stacked tightly from layer to layer.
(2) Analysis of thermal conductivity and electromagnetic shielding results
The films prepared in the above examples were tested for electromagnetic shielding effectiveness using ASTM ES7-83, and for thermal conductivity using ASTM E-1461, and the results and analyses were as follows:
TABLE 1 thermal conductivity and electromagnetic shielding effectiveness of the films prepared in the examples
As shown in table 1, in the above examples 1 to 5, as the content of MXene increases, the electromagnetic shielding performance of the MXene-based composite film increases, and the MXene-based composite films obtained in the above examples 1 to 8 all reach the commercial application standard (> 20dB), which indicates that the MXene-based composite films prepared by the preparation method of the present invention have excellent electromagnetic shielding performance.
As can be seen from table 1, in the above examples 1 to 5, as the content of MXene in the layer increases, the thermal conductivity of the MXene-based composite film increases first and then decreases; when the mass ratio of MXene to MMT is 9: when the thermal conductivity of the MXene-based composite film reaches the maximum value (28.8W/(m.K)); when the two-dimensional filler is reduced graphene oxide, the mass ratio of MXene to reduced graphene oxide is 9: 1, the thermal conductivity (67.3W/(m.K)) and the electromagnetic shielding effectiveness (73dB) of the prepared MXene-based composite film are optimal.
Although the electromagnetic shielding effectiveness of the comparative example pure MXene film was high, its thermal conductivity was relatively low; the MXene and other two-dimensional fillers are compounded, so that the heat conductivity of the prepared MXene-based composite film is greatly improved compared with that of a pure MXene film, and the heat conductivity coefficient reaches 67.3W/(m.K) to the maximum; the MXene-based composite film has the electromagnetic shielding effectiveness of 73dB under the thickness of 25 mu m. The MXene-based composite film prepared by the method has high heat conductivity and high electromagnetic shielding efficiency.
Referring to the ASMT D6413 vertical burning test standard, the MXene-based composite film prepared in the embodiment 2 of the invention is subjected to a burning test, as shown in FIG. 4, no burning phenomenon is generated, and the MXene-based composite film has remarkable flame retardant and fireproof effects; as shown in fig. 5, the electromagnetic shielding effectiveness of the MXene-based composite film prepared in example 2 after burning for 30s is still above 60dB, and the electromagnetic shielding effectiveness of the MXene-based composite film before burning is 67dB, which indicates that the electromagnetic shielding effectiveness is reduced little before and after burning; in conclusion, the MXene-based composite film prepared by the method has excellent fireproof performance and thermal stability.
The MXene-based composite film prepared by the method has good heat conduction, fire resistance, electromagnetic shielding and thermal stability, and has huge application potential and market value in the fields of wearable electronic equipment and the like.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A preparation method of an MXene-based high-thermal-conductivity fireproof electromagnetic shielding composite film is characterized by comprising the following steps: mixing the MXene solution and the two-dimensional filler solution, stirring and then performing ultrasonic treatment to prepare a mixed solution; and then, pouring the mixed solution into a filter flask with a filter membrane for suction filtration to obtain the MXene-based composite film.
2. The preparation method of the MXene-based high-thermal-conductivity fireproof electromagnetic shielding composite film according to claim 1, wherein the mass ratio of MXene to the two-dimensional filler in the mixed solution is 1-20: 0.01.
3. the preparation method of the MXene-based high-thermal-conductivity fireproof electromagnetic shielding composite film according to claim 2, wherein the MXene solution is prepared by the following steps:
adding LiF into an HCl solution, and stirring until the LiF is completely dissolved to prepare an etching solution; mixing Ti3AlC2Adding into the etching solution, stirring, and etching off Ti3AlC2After Al atom in the solution, Ti is obtained3C2The mixed acid solution of (4); washing the mixed acid solution with deionized water, centrifuging until the pH value is more than 6, removing supernatant to obtain multiple layers of MXene precipitates, adding deionized water, oscillating and centrifuging, and collecting supernatant to obtain single-layer or few-layer MXene solution; the concentration of the MXene solution is 0.1-15 mg/mL.
4. The preparation method of the MXene-based high-thermal-conductivity fireproof electromagnetic shielding composite film according to any one of claims 1 to 3, wherein the two-dimensional filler is one or more of MMT, BN, GO and rGO; the concentration of the two-dimensional filler solution is 0.1-15 mg/mL.
5. The preparation method of the MXene-based high-thermal-conductivity fireproof electromagnetic shielding composite film according to claim 4, wherein the thickness of the MXene-based composite film is 5-200 μm; the maximum electromagnetic shielding effectiveness of the MXene-based composite film is more than or equal to 73 dB; the maximum thermal conductivity of the MXene-based composite film is greater than or equal to 67.3W/(m.K).
6. The preparation method of the MXene-based high-thermal-conductivity fireproof electromagnetic shielding composite film according to claim 5, wherein the two-dimensional filler is MMT, and the preparation process of the MMT solution is as follows: and (3) putting the MMT into deionized water, sequentially carrying out ultrasonic treatment, stirring and centrifugation, and finally collecting supernatant to prepare the MMT solution.
7. The preparation method of the MXene-based high-thermal-conductivity fireproof electromagnetic shielding composite film according to claim 5, wherein the two-dimensional filler is BN, and the preparation process of the BN solution is as follows: placing BN powder into isopropanol solution, performing ultrasonic treatment and then centrifuging, collecting supernatant, and performing ultrasonic treatment to obtain stripped BN solution; wherein the isopropanol solution consists of 50% isopropanol and 50% deionized water.
8. The preparation method of the MXene-based high-thermal-conductivity fireproof electromagnetic shielding composite film according to claim 5, wherein the two-dimensional filler is GO, and the preparation process of the GO solution is as follows: mixing graphite flake with KMnO4Placing the mixture into a beaker, slowly adding mixed acid prepared from concentrated sulfuric acid and concentrated phosphoric acid into the beaker, and stirring the mixture at the lower side of room temperature; then, dropwise adding hydrogen peroxide into the beaker in an ice-water bath until no bubbles are generated, clarifying the reaction solution, pouring out the supernatant, cleaning with hydrochloric acid, cleaning with deionized water, and precipitating to the middleSex; and finally, centrifuging the reaction solution after ultrasonic treatment to obtain a supernatant, namely the few-layer or single-layer GO solution.
9. The preparation method of the MXene-based high-thermal-conductivity fireproof electromagnetic shielding composite film according to claim 5, wherein the two-dimensional filler is rGO, and the MXene-based composite film is prepared by the following steps: mixing the GO solution prepared in the claim 8 with the MXene solution to prepare an MXene/GO composite film, then placing the MXene/GO composite film in hydroiodic acid for in-situ reduction for 1h, washing and drying by using ethanol and deionized water to prepare the MXene/rGO composite film subjected to in-situ reduction.
10. An MXene-based high-thermal-conductivity fireproof electromagnetic shielding composite film prepared by the preparation method of claims 1-9.
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| CN113692211B (en) * | 2021-08-09 | 2024-02-20 | 中国人民解放军陆军工程大学 | Preparation method of composite film electromagnetic protection material based on MXene-rGO |
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| CN114804109A (en) * | 2022-04-11 | 2022-07-29 | 哈尔滨工业大学 | MXene composite film with oriented fold structure and preparation method thereof |
| CN115850968A (en) * | 2022-10-18 | 2023-03-28 | 中科院广州化学有限公司 | MXene-based high-thermal-conductivity fireproof composite film and preparation method and application thereof |
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