An energetic polynitrazole framework derived silver-doped porous thin film, a preparation method thereof and application thereof

Abstract

The application discloses an energetic multi-nitrogen azole framework derived silver doped porous film and a preparation method and application thereof, and comprises the following steps: grinding a triazol framework, heating and keeping warm under a nitrogen atmosphere, and cooling to obtain a carbonized triazol framework; ultrasonicating and stirring the substrate material and the obtained carbonized triazol framework to uniformly mix; adding silver salt, carrying out dark treatment, and irradiating to reduce silver ions into nano silver particles; irradiating and stirring at the same time to uniformly distribute the reduction, obtaining a silver doped porous material solution, vacuum-assisted filtering, drying, and obtaining the energetic multi-nitrogen azole framework derived silver doped porous film. The triazol framework is combined with bacterial cellulose, the prepared porous cellulose film has the advantages of a large specific surface area, rich pore structure, adjustable structure and the like, and also has the advantages of good mechanical properties, the synergistic effect of nano silver particles and the porous structure of the material is realized, and the shielding performance of the material can reach more than -60 dB.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electromagnetic wave shielding materials, in particular to a silver-doped porous film containing an energetic multi-nitrogen azole framework and a preparation method and application thereof. BACKGROUND

[0002] Electromagnetic interference shielding is an important and effective technique to limit the destructive electromagnetic radiation of electromagnetic interference. The conductive enclosure inside the original electromagnetic interference shielding device is named Faraday cage, whose internal electric field is zero. According to this principle, metal materials including stainless steel, copper, aluminum and silver are made into shielding cabinets, foils, conductive coatings and fabrics. However, such materials are always limited by high defect density, easy corrosion and high cost. Carbon-based materials including carbon black, graphene and carbon nanotubes have low density, excellent chemical resistance and electrical properties, and thus are often filled into polymers to manufacture lightweight, flexible conductive polymer composites. According to the shielding principle of electromagnetic wave shielding materials, the impedance of conductive materials does not match that of free space, and part of the incident electromagnetic wave is reflected on the surface of the material. The higher the electrical conductivity of the material, the lower the impedance matching degree of the material with the free space, and the greater the reflected electromagnetic wave power, so high electrical conductivity is an important factor of electromagnetic wave shielding materials.

[0003] Porous solid materials with nanoscale porosity have extremely high specific surface area and have been used for adsorption, separation, exchange and heterogeneous catalysis for a long time. Among this family, metal-organic frameworks (MOFs) have attracted attention due to their large specific surface area, variable pore size and controllable chemical properties of organic ligands, which enable specific and selective binding. While developing new MOFs and characterizing their properties, efforts have been made to create mesoscopic superstructures of MOFs to enhance the performance of MOFs and increase their processability in different applications. The main method to introduce new functions is to conjugate MOF nanocrystals or microcrystals to other materials, especially to introduce MOFs into polymer fibers, which can take advantage of highly developed technical capabilities, thereby producing composite materials with excellent performance and wide application prospects. The patent with publication number CN117604720A combines a triazole framework material with an electrospinning process to prepare a nanofiber film material with shielding performance of more than -50 dB, and the shielding mechanism is mainly absorption. The nanofiber is formed by electrospinning and then heat treated. Such a treatment is mainly to make the polyacrylonitrile fiber stable at a certain temperature, thereby improving the density of the material fiber. However, the fiber material prepared in this way is easily damaged because the outer layer is not protected by a polymer, and the tensile strength is poor. SUMMARY

[0004] The application aims to provide an energetic silver-doped porous film derived from a nitrogen-triazole framework;

[0005] Another object of the application is to provide a preparation method of the energetic silver-doped porous film derived from a nitrogen-triazole framework.

[0006] The application further provides an application of the energetic silver-doped porous film derived from a nitrogen-triazole framework in electromagnetic shielding.

[0007] To achieve the objects of the application, the technical scheme adopted is as follows:

[0008] A preparation method of an energetic silver-doped porous film derived from a nitrogen-triazole framework comprises the following steps:

[0009] Step 1: grinding a triazole framework, heating under a protective gas, and cooling to obtain a carbonized triazole framework;

[0010] Step 2: dispersing a base material in a solvent, mixing the carbonized triazole framework obtained in step 1 uniformly, and obtaining a mixed solution;

[0011] Step 3: uniformly dispersing a silver salt in the mixed solution obtained in step 2, avoiding light treatment, and irradiating to reduce silver ions into nano silver particles to obtain a silver-doped porous material solution;

[0012] Step 4: vacuum-assisted filtering the silver-doped porous material solution obtained in step 3, and drying to obtain the energetic silver-doped porous film derived from a nitrogen-triazole framework.

[0013] In the above technical scheme, the preparation method of the triazole framework in step 1 is as follows:

[0014] A certain amount of ZnCl2 is dissolved in a mixture solvent of ethanol, water, ammonia hydroxide and N, N-dimethylformamide, 1H-1, 2, 3-triazole is added dropwise into the mixture, stirring at room temperature, filtering and drying to obtain a white powder triazole framework.

[0015] In the above technical scheme, the heating temperature of the triazole framework in step 1 is 800-1000℃, and the holding time is 1-3 h.

[0016] In the above technical scheme, in step 2, the base material is bacterial cellulose, polyamide, polyvinyl alcohol or polyethylene terephthalate, and the mass ratio of the base material to the carbonized triazole framework is 0.8-1.5.

[0017] In the above technical scheme, the concentration of the bacterial cellulose dispersion solution is 5-9 mg / mL.

[0018] In the above technical scheme, the silver salt in step 3 is selected from any one of silver nitrate, silver acetate, silver chlorate and silver perchlorate.

[0019] In the technical solution, the concentration of the silver salt is 50-500 mM.

[0020] In the technical solution, the light irradiation condition in step 3 is ultraviolet light irradiation or xenon lamp irradiation, the light irradiation time is not less than 1 h, and the stirring time is not less than 1 h.

[0021] Another aspect of the present application also includes the energetic multi-nitrogen azole framework derived silver-doped porous thin film obtained by the preparation method.

[0022] Another aspect of the present application also includes the application of the energetic multi-nitrogen azole framework derived silver-doped porous thin film in electromagnetic shielding.

[0023] Compared with the prior art, the present application has the following beneficial effects:

[0024] 1. The present application adopts a vacuum-assisted filtration technology, so that the thin film material has a dense and stacked porous structure inside, providing more paths for multiple reflection of electromagnetic waves.

[0025] 2. Unlike the shielding mechanism of CN117604720A which mainly relies on absorption, the shielding performance of the present application can also reach more than -50 dB, which may be due to the nanofiber structure brought by the electrospinning process, which is beneficial to the multiple reflection of electromagnetic waves inside the material. In the present application, MOFs are used as precursors, and silver nanoparticles are reduced by simple ultraviolet light irradiation. During the light irradiation process, only silver is loaded, and after carbonization, the silver nanoparticles are relatively uniformly distributed on the triazole framework. The prepared energetic multi-nitrogen azole framework derived silver-doped porous thin film has the advantages of rich pore structure, large specific surface area, and adjustable structure. At the same time, combined with the vacuum-assisted filtration technology, the silver nanoparticles are better combined with the porous structure, enhancing the electrical conductivity of the material, and the shielding performance of the prepared energetic multi-nitrogen azole framework derived silver-doped porous thin film can reach more than -60 dB.

[0026] 3. In the present application, the heat treatment stage of the triazole framework at 800-1000℃ is carried out after the preparation of the triazole framework and before the mixing of the triazole framework with bacterial cellulose. After heat treatment, the bacterial cellulose is fully intermixed. The purpose of the pre-heat treatment is to retain the mechanical properties brought by the bacterial cellulose. At the same time, the vacuum-assisted filtration process is adopted to improve the bonding strength between the bacterial celluloses, so that the obtained energetic multi-nitrogen azole framework derived silver-doped porous thin film has high porosity, strong tensile strength and deformation. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is the flowchart of the energetic multi-nitrogen azole framework derived silver-doped porous thin film of the present application.

[0028] Figure 2XRD pattern of the silver doped porous thin film BMA-1000, BMA-900, BMA-800 and the comparative example BC derived from energetic multi-nitroazole framework of the present application.

[0029] Figure 3 SEM pattern of the silver doped porous thin film derived from energetic multi-nitroazole framework of the present application.

[0030] Figure 4 Electromagnetic wave shielding performance pattern of the silver doped porous thin film BMA-1000, BMA-900, BMA-800 and the comparative example BC derived from energetic multi-nitroazole framework of the present application.

[0031] Figure 5 Electromagnetic wave shielding mechanism pattern of the silver doped porous thin film BMA-1000, BMA-900, BMA-800 and the comparative example BC derived from energetic multi-nitroazole framework of the present application.

[0032] Figure 6 Mechanical property comparison pattern of the silver doped porous thin film BMA-1000 and the comparative example BC derived from energetic multi-nitroazole framework of the present application. DETAILED DESCRIPTION

[0033] The present application provides a preparation method of the vacuum-assisted filtration of the silver doped porous thin film derived from energetic multi-nitroazole framework. The silver nanoparticles are reduced by simple ultraviolet light irradiation. Only silver is loaded during the light irradiation process. After carbonization, the nanosilver particles are relatively uniformly distributed on the triazole framework. By incorporating silver nanoparticles, the electrical conductivity of the material is improved. In combination with the vacuum-assisted filtration process, the silver nanoparticles are closely combined with the porous structure of the MOFs. The present application will be further described in detail in combination with specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application.

[0034] Example 1

[0035] Reference Figure 1 A preparation method of an energetic multi-nitroazole framework derived porous thin film, the specific operation steps are as follows:

[0036] Step 1, 5 g of ZnCl2 is dissolved in 50 mL of ethanol, 75 mL of water, 20 mL of a mixture solvent of ammonia hydroxide with a mass fraction of 25 % to 28 %, and 50 mL of N, N-dimethylformamide. 6.26 mL of 1H-1, 2, 3-triazole is added to the mixture, stirred at room temperature for 24 h, the white product is filtered out, washed with ethanol, and dried at 80 °C for 8 h to prepare a triazole framework.

[0037] Step 2, the triazole framework obtained in step 1 is ground into fine powder, the triazole framework powder is placed in a porcelain boat, heated to 1000°C at a heating rate of 5°C / min under a nitrogen atmosphere in a program-controlled tube furnace, and kept for 2 hours, and then cooled to room temperature to obtain a carbonized triazole framework;

[0038] Step 3, 30.6 mL of a bacterial cellulose dispersion solution with a mass fraction of 0.8% is added to 35 mL of deionized water, and after being warmed at 50°C and ultrasonicated for 30 min, the mixture is stirred for 4 h, and 0.3 g of the carbonized triazole framework is subjected to mutual mixing, ultrasonication and stirring for 24 h;

[0039] Step 4, 300 mM of silver nitrate is added to the solution obtained in step 3, the beaker is wrapped with tin paper to avoid light, and the mixture is irradiated with ultraviolet light for 1 h on a magnetic stirrer, so that the silver ions are reduced to nano-silver particles, and the mixture is stirred at room temperature at the same time, so that the nano-silver particles are uniformly reduced and distributed, to obtain a silver-doped porous cellulose solution;

[0040] Step 5, the solution obtained in step 4 is subjected to vacuum-assisted filtration and drying to obtain an energetic triazole framework-derived porous film with good mechanical properties, denoted as BMA-1000;

[0041] Step 6, the energetic triazole framework-derived porous film is subjected to electromagnetic wave shielding performance testing.

[0042] Example 2

[0043] A preparation method of an energetic triazole framework-derived porous film, comprising the following steps:

[0044] Step 1, 5 g of ZnCl2 is dissolved in a mixture of 50 mL of ethanol, 75 mL of water, 20 mL of ammonia hydroxide with a mass fraction of 25% to 28%, and 50 mL of N,N-dimethylformamide, 6.26 mL of 1H-1,2,3-triazole is added dropwise into the mixture, and the mixture is stirred at room temperature for 24 h, the white product is filtered out, washed with ethanol, and dried at 80°C for 8 h to obtain a triazole framework;

[0045] Step 2, the triazole framework obtained in step 1 is ground into fine powder, the triazole framework powder is placed in a porcelain boat, heated to 1000°C at a heating rate of 5°C / min under a nitrogen atmosphere in a program-controlled tube furnace, and kept for 2 hours, and then cooled to room temperature to obtain a carbonized triazole framework;

[0046] Step 3, 30.6 mL of polyvinyl alcohol with a mass fraction of 0.8% is added to 35 mL of deionized water, and after being warmed to 50°C and ultrasonicated for 30 min, it is stirred for 4 h; 0.3 g of the carbonized triazole framework is subjected to mutual mixing and ultrasonication, stirring, and mutual mixing and stirring for 24 h, and the stirring is uniform;

[0047] Step 4, 200 mM of silver acetate is added to the solution obtained in step 3, the beaker is wrapped with tin paper to avoid light, and ultraviolet light is used to irradiate on a magnetic stirrer for 1 h, so that the silver ions are reduced to nano-silver particles, and the nano-silver particles are uniformly reduced and distributed by stirring at room temperature during irradiation, to obtain a silver-doped porous material solution;

[0048] Step 5, the solution obtained in step 4 is subjected to vacuum-assisted filtration, to obtain an energetic triazole framework-derived porous film with good mechanical properties, denoted as BMA-900;

[0049] Step 6, the energetic triazole framework-derived porous film is subjected to electromagnetic wave shielding performance testing.

[0050] Example 3

[0051] A method for preparing an energetic triazole framework-derived porous film, comprising the following steps:

[0052] Step 1, 5 g of ZnCl2 is dissolved in a mixture of 50 mL of ethanol, 75 mL of water, 20 mL of ammonia hydroxide with a mass fraction of 25% to 28%, and 50 mL of N,N-dimethylformamide, 6.26 mL of 1H-1,2,3-triazole is added dropwise to the mixture, and the mixture is stirred at room temperature for 24 h; the white product is filtered out, washed with ethanol, and dried at 80°C for 8 h, to obtain a triazole framework;

[0053] Step 2, the triazole framework obtained in step 1 is ground into fine powder, and the triazole framework powder is placed in a porcelain boat, heated to 800°C at a heating rate of 5°C / min in a program-controlled tube furnace under a nitrogen atmosphere, and kept at 800°C for 2 h; the triazole framework is cooled to room temperature, to obtain a carbonized triazole framework;

[0054] Step 3, 30.6 mL of polyvinyl alcohol with a mass fraction of 0.8% is added to 35 mL of deionized water, and after being warmed to 50°C and ultrasonicated for 30 min, it is stirred for 4 h; 0.3 g of the carbonized triazole framework is subjected to mutual mixing and ultrasonication, stirring, and mutual mixing and stirring for 24 h, and the stirring is uniform;

[0055] Step 4, 100 mM of silver perchlorate was added to the solution obtained in step 3, the beaker was wrapped with tin paper to avoid light, and was irradiated with ultraviolet light on a magnetic stirrer for 1 h to reduce silver ions to nano-silver particles, and the nano-silver particles were uniformly reduced and distributed by stirring at room temperature during the irradiation to obtain a silver-doped porous material solution;

[0056] Step 5, the solution obtained in step 4 was vacuum-assisted filtration to obtain an energetic multi-azole framework derived porous film with good mechanical properties, denoted as BMA-800;

[0057] Step 6, the electromagnetic wave shielding performance of the energetic multi-azole framework derived porous film was tested.

[0058] Example 4

[0059] A method for preparing an energetic multi-azole framework derived porous film, comprising the following steps:

[0060] Step 1, 5 g of ZnCl2 was dissolved in a mixture of 50 mL of ethanol, 75 mL of water, 20 mL of ammonia hydroxide with a mass fraction of 25% to 28%, and 50 mL of N, N-dimethylformamide, 6.26 mL of 1H-1, 2, 3-triazole was added to the mixture, and stirred at room temperature for 24 h, the white product was filtered out, washed with ethanol, and dried at 80°C for 8 h to obtain a triazole framework;

[0061] Step 2, the triazole framework obtained in step 1 was ground into fine powder, and the triazole framework powder was placed in a porcelain boat, heated to 1000°C at a heating rate of 5°C / min in a program-controlled tube furnace under a nitrogen atmosphere, and kept for 2 hours, and then cooled to room temperature to obtain a carbonized triazole framework;

[0062] Step 3, 21.875 mL of polyethylene terephthalate with a mass fraction of 0.8% was added to 35 mL of deionized water, and after ultrasonic treatment at 50°C for 30 min, the mixture was stirred for 4 h, 0.3 g of the carbonized triazole framework was subjected to mutual mixing, ultrasonic treatment and stirring for 24 h to obtain a uniform mixture;

[0063] Step 4, 300 mM of silver perchlorate was added to the solution obtained in step 3, the beaker was wrapped with tin paper to avoid light, and was irradiated with ultraviolet light on a magnetic stirrer for 2 h to reduce silver ions to nano-silver particles, and the nano-silver particles were uniformly reduced and distributed by stirring at room temperature during the irradiation to obtain a silver-doped porous material solution;

[0064] Step 5, the solution obtained in step 4 was vacuum-assisted filtration to obtain an energetic multi-azole framework derived porous film with good mechanical properties;

[0065] Step 6, the energetic multi-nitrazole framework derived porous membrane is tested for electromagnetic wave shielding performance.

[0066] Example 5

[0067] A method for preparing an energetic multi-nitrazole framework derived porous membrane, comprising the following steps:

[0068] Step 1, 5 g of ZnCl2 is dissolved in a mixture of 50 mL of ethanol, 75 mL of water, 20 mL of ammonia hydroxide with a mass fraction of 25% to 28%, and 50 mL of N, N-dimethylformamide, 6.26 mL of 1H-1, 2, 3-triazole is added to the mixture, stirred at room temperature for 24 h, the white product is filtered out, washed with ethanol, and dried at 80°C for 8 h to obtain a triazole framework;

[0069] Step 2, the triazole framework obtained in step 1 is ground into fine powder, the triazole framework powder is placed in a porcelain boat, heated to 1000°C at a heating rate of 5°C / min in a program-controlled tube furnace under a nitrogen atmosphere, and kept for 2 hours, and then cooled to room temperature to obtain a carbonized triazole framework;

[0070] Step 3, 21.875 mL of bacterial cellulose with a mass fraction of 0.8% is added to 35 mL of deionized water, after ultrasonic treatment at 50°C for 30 min, stirring is performed for 4 h, 0.3 g of the carbonized triazole framework is subjected to mutual mixing and stirring, and the mutual mixing and stirring is performed for 24 h;

[0071] Step 4, 300 mM of silver perchlorate is added to the solution obtained in step 3, the beaker is wrapped with tin paper for light shielding treatment, ultraviolet light is used for illumination for 1 h on a magnetic stirrer, so that the silver ions are reduced to nano-silver particles, and the nano-silver particles are uniformly distributed by stirring at room temperature during illumination, to obtain a silver-doped porous cellulose solution;

[0072] The solution obtained in step 4 is subjected to vacuum-assisted filtration to obtain an energetic multi-nitrazole framework derived porous membrane with good mechanical properties;

[0073] Step 6, the energetic multi-nitrazole framework derived porous membrane is tested for electromagnetic wave shielding performance.

[0074] Comparative Example 1

[0075] 21.875 mL of bacterial cellulose with a mass fraction of 0.8% is added to 35 mL of deionized water, after ultrasonic treatment at 50°C for 30 min, stirring is performed for 4 h, and then the obtained solution is subjected to vacuum-assisted filtration to obtain a cellulose membrane without modification, which is denoted as BC.

[0076] Figure 1 is a preparation method flow chart of the energy-containing multi-nitrazole framework derived silver-doped porous thin film of the present application, and the energy-containing multi-nitrazole framework derived silver-doped porous thin film can be obtained through five steps.

[0077] Figure 2 is the XRD diagram of the energy-containing multi-nitrazole framework derived silver-doped porous thin film BMA-1000, BMA-900, BMA-800 and the comparative example BC of the present application, and it can be seen that after the silver nanoparticles are reduced by ultraviolet light, the peaks corresponding to the standard card of silver nanoparticles appear, indicating that the silver is successfully loaded on the pores of the bacterial cellulose and the triazole.

[0078] Figure 3 is the scanning electron microscope (SEM) diagram of the energy-containing multi-nitrazole framework derived silver-doped porous electromagnetic wave shielding material of the present application, and it can be seen that the material has a rich porous structure, and the doping of the silver nanoparticles does not block the pores of the material, providing more effective paths for the multiple reflections of electromagnetic waves in the material.

[0079] Figure 4 is the electromagnetic wave shielding performance diagram of the energy-containing multi-nitrazole framework derived silver-doped porous thin film BMA-1000, BMA-900, BMA-800 and the comparative example BC of the present application, and it can be seen that the thin film without silver nanoparticles and triazole framework does not have obvious shielding performance, while the cellulose thin film with silver nanoparticles and triazole framework has a shielding performance of up to -60-80 dB, and as the concentration of silver salt increases, the number of silver nanoparticles doped into the flexible porous cellulose thin film increases, and the shielding performance of the porous cellulose thin film increases. It can be seen that the successful doping of silver nanoparticles greatly improves the electromagnetic wave shielding performance of the flexible porous fiber electromagnetic shielding thin film, reflecting the superiority of the material.

[0080] Figure 5 is the electromagnetic wave shielding mechanism diagram of the energy-containing multi-nitrazole framework derived silver-doped porous thin film BMA-1000, BMA-900, BMA-800 and the comparative example BC of the present application. It can be seen that the SEA value of BMA-1000, BMA-900, BMA-800 is much higher than the SER value, indicating that the shielding mechanism of the material is mainly absorption, and as the concentration of silver salt of the material increases, the number of silver nanoparticles doped into the nanocellulose thin film increases, and the shielding performance of the nanocellulose thin film increases, and the SEA and SET of BMA-1000, BMA-900, BMA-800 also increase accordingly. It indicates that the electromagnetic wave enters the material and is shielded by multiple reflections inside the material.

[0081] Figure 6It is the mechanical property comparison chart of BMA-1000 and the comparative example BC of the present application, it can be seen that the deformation performance of the pure bacterial cellulose film without doping energetic polyazole framework and nano silver particles is better, but its tensile resistance is very poor, the material is hard, while the deformation performance of the fiber film doped with energetic polyazole framework and nano silver particles is worse than that of the pure bacterial cellulose film, but the tensile resistance is better, which can effectively avoid the fracture phenomenon under external force.

[0082] According to the process parameter adjustment according to the content of the present application, the energetic polyazole framework derived silver doped porous electromagnetic wave shielding material of the present application can be prepared, and the performance is basically consistent with that of example 1.

[0083] The above is only the preferred embodiment of the present application, it should be pointed out that for ordinary skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can also be made, these improvements and refinements should be considered as the protection scope of the present application.

Claims

1. A method for the preparation of an energetic polynitrazole framework derived silver doped porous thin film, characterized in that, The method comprises the following steps: Step 1, grinding the triazole framework and heating under a protective gas, the heating temperature is 1000 DEG C, the holding time is 1-3 h, and the carbonized triazole framework is obtained after cooling, the preparation method of the triazole framework is as follows: ZnCl2 is weighed and dissolved in a mixture of ethanol, water, ammonia hydroxide and N, N-dimethylformamide, 1H-1, 2, 3-triazole is added dropwise into the mixture, stirring at room temperature, and drying after filtration to obtain white powder triazole framework; Step 2, dispersing the matrix material in a solvent, the matrix material is bacterial cellulose, and the carbonized triazole framework obtained in step 1 is mixed uniformly, and a mixed solution is obtained; Step 3, uniformly dispersing silver salt in the mixed solution obtained in step 2, avoiding light treatment, and reducing silver ions to nano-silver particles by light to obtain a silver-doped porous material solution; Step 4, vacuum-assisted filtration is carried out on the silver-doped porous material solution obtained in step 3, and drying is carried out to obtain an energetic triazole framework derived silver-doped porous film.

2. The method for preparing a silver-doped porous thin film derived from a energetic polyazole framework as described in claim 1, characterized in that, In step 2, the mass ratio of the matrix material to the carbonized triazole framework is 0.8-1.

5.

3. The method for preparing a silver-doped porous thin film derived from a energetic polyazole framework as described in claim 2, characterized in that, The concentration of the bacterial cellulose dispersion is 5-9 mg / mL.

4. The method for preparing a silver-doped porous thin film derived from a energetic polyazole framework as described in claim 1, characterized in that, The silver salt in step 3 is selected from any one of silver nitrate, silver acetate, silver chlorate and silver perchlorate.

5. The method for preparing a silver-doped porous thin film derived from a energetic polyazole framework as described in claim 4, characterized in that, The concentration of the silver salt is 50-500 mM.

6. The method for preparing a silver-doped porous thin film derived from a energetic polyazole framework as described in claim 1, characterized in that, The light irradiation condition in step 3 is ultraviolet light irradiation or xenon lamp irradiation, the light irradiation time is not less than 1 h, and stirring is carried out at room temperature at the same time.

7. The energetic triazole framework derived silver-doped porous film prepared by the method of any one of claims 1-6.

8. The application of the energetic triazole framework derived silver-doped porous film in electromagnetic shielding according to claim 7.

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