CNT / ANF array film and preparation method and application thereof

Abstract

The invention belongs to the technical field of new materials, and particularly relates to a CNT / ANF array film and a preparation method and application thereof, and the preparation method comprises the following steps: combining any two CNT / ANF aqueous dispersions with different CNT contents to obtain a plurality of groups of CNT / ANF aqueous dispersion combinations with different CNT contents; combining a plurality of groups of CNT / ANF aqueous dispersions with different CNT contents, and performing vacuum-assisted suction filtration and drying according to a rectangular array arrangement form to obtain a CNT / ANF array film; wherein the CNT / ANF array thin film comprises a plurality of CNT / ANF combination point positions which are distributed in an array, and each CNT / ANF combination point position comprises two CNT / ANF pattern points with different CNT contents; according to the invention, information encryption or decryption is realized by virtue of unique physical characteristics of the film, so that the complexity and security of information encryption are improved; the CNT / ANF array film has the characteristics of temperature resistance, corrosion resistance and high strength.

Description

Technical Field

[0001] This invention belongs to the field of new materials technology, and specifically relates to a CNT / ANF array thin film, its preparation method and application. Background Technology

[0002] With the accelerated development of information technology and digitalization, hacking techniques have become increasingly sophisticated. They not only steal information but also pose a serious threat by disrupting network order and creating false information. In order to resist the ever-evolving decryption methods and safeguard information security, it is particularly important to encrypt, prevent counterfeiting, and detect important information.

[0003] Information encryption refers to converting plaintext into ciphertext through encryption technology, thereby effectively protecting information during storage and transmission. Currently, traditional information encryption and decryption mainly use numbers, letters, or characters as carriers. Although these methods involve complex mathematical algorithms and cryptographic theories, traditional numerical string encryption still poses significant security risks. Summary of the Invention

[0004] To address the technical problems existing in the prior art, this invention provides a CNT / ANF array thin film, its preparation method, and its application, in order to solve the technical problem that traditional digital string encryption still has significant security risks.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: This invention provides a method for preparing a CNT / ANF array thin film, comprising: By combining any two CNT / ANF aqueous dispersions with different CNT contents, several combinations of CNT / ANF aqueous dispersions with different CNT contents can be obtained. Several groups of CNT / ANF aqueous dispersions with different CNT contents were combined and arranged in a rectangular array, and then vacuum-assisted filtration was performed to obtain CNT / ANF matrix composite gels. The CNT / ANF matrix composite gel is dried to obtain a CNT / ANF array film; wherein the CNT / ANF array film includes a number of CNT / ANF combination sites distributed in an array, and each CNT / ANF combination site includes two CNT / ANF pattern sites with different CNT contents.

[0006] Furthermore, the preparation process of CNT / ANF aqueous dispersions with different CNT contents is as follows: ANF / DMSO dispersion was protonated using CNT aqueous dispersion to obtain several CNT / ANF aqueous dispersions with different CNT contents.

[0007] Furthermore, the mass fraction of the CNT aqueous dispersion was 0.2 wt.%; in several CNT / ANF aqueous dispersions with different CNT contents, the mass fraction of CNT compared to ANF was 0-0.725 wt.%.

[0008] The present invention also provides a CNT / ANF array thin film, which is prepared using the aforementioned CNT / ANF array thin film preparation method.

[0009] The present invention also provides an application of a CNT / ANF array thin film, which is used for information encryption or decryption.

[0010] Furthermore, the CNT / ANF array film is used in the process of information encryption or decryption, including: Within a preset wavelength range, the transmittance of one CNT / ANF pattern point in each CNT / ANF combination point is measured to obtain the transmittance curve of one CNT / ANF pattern point in each CNT / ANF combination point. Based on the transmittance curve of one CNT / ANF pattern point in each CNT / ANF combination point, determine the wavelength data corresponding to one CNT / ANF pattern point in each CNT / ANF combination point at the preset transmittance T0; Based on the wavelength data corresponding to one of the CNT / ANF pattern points in each CNT / ANF combination point under the preset transmittance T0, the transmittance of the other CNT / ANF pattern point in each CNT / ANF combination point is measured to obtain the transmittance data of the other CNT / ANF pattern point in each CNT / ANF combination point. Sort the transmittance data of another CNT / ANF pattern point in all CNT / ANF combination points, and remove the maximum, minimum and transmittance data that are equal to the preset transmittance T0 to obtain the transmittance sequence. The transmittance sequence is encoded according to the preset encoding rules to obtain code 1; Using a preset key, code 1 is transcoded to obtain code 2; Using a preset encoding table, decode encoding 2 to obtain the encrypted ciphertext.

[0011] Furthermore, the preset wavelength range is 400-800nm.

[0012] Furthermore, the preset transmittance T0 is 5%-10%.

[0013] Furthermore, the transmittance data of another CNT / ANF pattern point in all CNT / ANF combination points are sorted, and the transmittance data with the highest, lowest, and the same as the preset transmittance T0 are removed to obtain the transmittance sequence, as follows: Based on the magnitude of the transmittance data, arrange the transmittance data of the other CNT / ANF pattern point in all CNT / ANF combination points in ascending order; then, remove the maximum, minimum, and transmittance data that are equal to the preset transmittance T0 to obtain the transmittance sequence.

[0014] Furthermore, the default encoding table is a Chinese character encoding table.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention provides a CNT / ANF array film, its preparation method, and its applications. Using ANF as a substrate, and leveraging the optical properties of CNTs, a CNT / ANF array film with a preset array pattern is prepared. The preset array pattern is constructed from several arrayed CNT / ANF combination points. During information encryption and decryption, the arrayed CNT / ANF combination points in the preset array pattern serve as the information encryption carrier. Utilizing the optical properties of the CNT / ANF array film and the transmittance of each CNT / ANF pattern point, the ciphertext is hidden within the preset array pattern, achieving information encryption. This is particularly suitable for ensuring the security and accuracy of Chinese characters during encryption and decryption. Compared to traditional encryption methods using numbers, letters, or characters as carriers, which pose significant security risks, this invention utilizes the unique physical properties of the film to achieve information encryption or decryption, greatly enhancing the complexity and security of information encryption and providing a more effective means of safeguarding information security. Furthermore, the CNT / ANF array film possesses characteristics of temperature resistance, corrosion resistance, and high strength, enabling it to be used for ciphertext hiding and transmission, as well as for anti-counterfeiting identification. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 An optical photograph of the CNT / ANF array thin film prepared in Example 1; Figure 2 This is a transmittance curve of the CNT / ANF pattern points located in the right region of each CNT / ANF combination point in Example 1; Figure 3 This is a table showing the correspondence between the transmittance data and wavelength data of the CNT / ANF pattern points located in the left region of each CNT / ANF combination point in Example 1; Figure 4 This is a schematic diagram of the process of encoding the transmittance sequence to obtain code 1 in Example 1; Figure 5 This is a schematic diagram of the process of transcoding number 1 to obtain code 2 in Example 1; Figure 6 This is a schematic diagram of the process of decoding code 2 to obtain encrypted ciphertext in Example 1. Detailed Implementation

[0018] To make the technical problems, technical solutions, and beneficial effects solved by this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0019] This invention provides a method for preparing a CNT / ANF array thin film, comprising the following steps: Step 101: Based on the chemical splitting method, potassium hydroxide (KOH) and para-aramid short-cut fibers (PPTA) are added sequentially to dimethyl sulfoxide (DMSO) and stirred continuously to obtain an ANF / DMSO dispersion.

[0020] Step 102: Protonation treatment of the ANF / DMSO dispersion was performed using a CNT aqueous dispersion to obtain several CNT / ANF aqueous dispersions with different CNT contents. The mass fraction of the CNT aqueous dispersion was 0.2 wt.%; in the several CNT / ANF aqueous dispersions with different CNT contents, the mass fraction of CNT relative to ANF ranged from 0 to 0.725 wt.%.

[0021] Step 103: Combine any two CNT / ANF aqueous dispersions with different CNT contents to obtain several combinations of CNT / ANF aqueous dispersions with different CNT contents.

[0022] Step 104: Combine several groups of CNT / ANF aqueous dispersions with different CNT contents, arrange them in a rectangular array, and perform vacuum-assisted filtration to obtain CNT / ANF matrix composite gel.

[0023] Step 105: Dry the CNT / ANF matrix composite gel to obtain a CNT / ANF array film; wherein, the CNT / ANF array film includes a number of CNT / ANF combination sites distributed in an array, and each CNT / ANF combination site includes two CNT / ANF pattern sites with different CNT contents.

[0024] This invention also provides an application of a CNT / ANF array film, wherein the CNT / ANF array film is used for information encryption or decryption; specifically, the process of using the CNT / ANF array film for information encryption or decryption includes: Step 201: Within a preset wavelength range, measure the transmittance of one CNT / ANF pattern point in each CNT / ANF combination point to obtain the transmittance curve of one CNT / ANF pattern point in each CNT / ANF combination point; wherein, the preset wavelength range is 400-800nm.

[0025] Step 202: Based on the transmittance curve of one CNT / ANF pattern point in each CNT / ANF combination point, determine the wavelength data corresponding to one CNT / ANF pattern point in each CNT / ANF combination point at a preset transmittance T0; wherein, the preset transmittance T0 is 5%-10%.

[0026] Step 203: Based on the wavelength data corresponding to one of the CNT / ANF pattern points in each CNT / ANF combination point under the preset transmittance T0, measure the transmittance of the other CNT / ANF pattern point in each CNT / ANF combination point to obtain the transmittance data of the other CNT / ANF pattern point in each CNT / ANF combination point.

[0027] Step 204: Sort the transmittance data of the other CNT / ANF pattern point in all CNT / ANF combination points, and remove the maximum, minimum, and transmittance data equal to the preset transmittance T0 to obtain a transmittance sequence; specifically, arrange the transmittance data of the other CNT / ANF pattern point in all CNT / ANF combination points in ascending order according to the value of the transmittance data; then, remove the maximum, minimum, and transmittance data equal to the preset transmittance T0 to obtain a transmittance sequence.

[0028] Step 205: Encode the transmittance sequence according to the preset coding rules to obtain code 1; Step 206: Using the preset key, transcode number 1 to obtain code 2; Step 207: Decode code 2 using a preset encoding table to obtain encrypted ciphertext; wherein the preset encoding table is a Chinese character encoding table; preferably, the Chinese character encoding table is the GB2312-80 simplified character set.

[0029] Preparation principle: The method for preparing the CNT / ANF array thin film of the present invention firstly involves KOH providing an alkaline environment in DMSO to promote the breaking of hydrogen bonds between PPTA molecules; simultaneously, K+ in potassium hydroxide... + The CNTs interact with the anionic groups on the PPTA molecular chains, weakening the intermolecular forces and causing the PPTA to dissociate and form nanofibers during continuous stirring, thus obtaining a uniform ANF / DMSO dispersion. Next, water molecules in the CNT aqueous dispersion interact with DMSO and ANF in the ANF / DMSO dispersion, causing the anionic groups on the ANF molecular chains to regain protons and recover some of their original chemical properties. Simultaneously, CNTs are uniformly dispersed in the ANF dispersion. By controlling the amount of CNT aqueous dispersion added, several CNT / ANF aqueous dispersions with different CNT contents can be obtained. Then, any two CNT / ANF aqueous dispersions with different CNT contents are combined and arranged in a rectangular array for vacuum-assisted filtration. During filtration, water is gradually extracted under vacuum, and the CNT and ANF nanofibers settle on the filter membrane. The CNT / ANF matrix composite gel with a specific lattice structure is formed by the alternating arrangement of dispersions with different CNT contents. Finally, the CNT / ANF matrix composite gel is dried to remove residual moisture and solidify, ultimately yielding a CNT / ANF array film. Since the CNT / ANF array film comprises several arrayed CNT / ANF combination points, each containing two CNT / ANF pattern points with different CNT contents, the optical properties and transmittance sorting rules of the CNT / ANF film allow for the concealment of encrypted messages within these arrayed CNT / ANF combination points, providing a physical basis for information encryption and decryption. Furthermore, the CNT / ANF array film possesses temperature resistance, corrosion resistance, and high strength, enabling it to be used not only for encrypted message concealment and transmission but also for anti-counterfeiting identification.

[0030] Information encryption or decryption principles: The application of the CNT / ANF array film described in this invention involves each CNT / ANF combination point comprising two CNT / ANF pattern points with different CNT contents. Based on the different absorption and transmission characteristics of CNTs for different wavelengths of light, when light within a preset wavelength range shines on each CNT / ANF pattern point, part of the light is absorbed, while part is transmitted. A transmittance measuring instrument can measure the ratio of the intensity of transmitted light to the intensity of incident light, thereby obtaining the transmittance curve for each CNT / ANF pattern point. Due to the different CNT contents, the absorption and transmission of light differ among CNT / ANF pattern points with different CNT contents, resulting in differences in their transmittance curves. Using the wavelength data corresponding to one of the CNT / ANF pattern points at a preset transmittance T0 as the incident light wavelength, the transmittance of the other CNT / ANF pattern point in each CNT / ANF combination point is measured again. Because of the different CNT contents in different pattern points, their transmittance also varies under the same incident light wavelength. The transmittance data of the other CNT / ANF pattern point in each combination point will be different. The transmittance data of the other CNT / ANF pattern point in all CNT / ANF combination points are sorted from smallest to largest, and the largest, smallest, and transmittance data equal to the preset transmittance T0 are removed to reduce the impact of abnormal data on subsequent encoding and ensure the diversity and uniqueness of the transmittance data, ultimately obtaining a transmittance sequence with a specific pattern. The transmittance sequence is encoded according to a preset encoding rule, converting the transmittance data into code 1. The preset encoding rule can be designed according to actual needs, such as dividing the transmittance data into different code values ​​according to certain intervals. Code 2 is obtained by performing specific mathematical operations or transformations on code 1, increasing the complexity and security of the encoding and preventing easy cracking of information. Code 2 is decoded using a preset encoding table, converting it into the corresponding Chinese characters to obtain the encrypted ciphertext. This realizes the use of the unique structure and optical properties of the CNT / ANF array film, providing a new technical means for information security.

[0031] In this invention, a CNT / ANF array film is prepared using polymer ANF as the matrix and CNTs are used to adjust the optical properties. This film is then applied to information encryption and decryption. By designing specific array patterns and combining the measurement, data processing, sorting, encoding, transcoding, and decoding of the transmittance of pattern points with different CNT contents, information encryption with dual sequences and two transcodings is achieved, greatly improving information security and effectively resisting the security risks of traditional digital string encryption. At the same time, the CNT / ANF composite film has the characteristics of temperature resistance, corrosion resistance, and high strength, making the array film perform excellently in ciphertext hiding and transmission. It can also be used for anti-counterfeiting identification, expanding its application scenarios and providing an innovative and effective solution for information security protection.

[0032] Example 1 This embodiment 1 provides a method for preparing and applying a CNT / ANF array thin film, including the following steps: Step 1: Add KOH and PPTA to DMSO in sequence and stir continuously to obtain ANF / DMSO dispersion.

[0033] Step 2: The ANF / DMSO dispersion was subjected to protonation treatment with a mass fraction of 0.2 wt.% to obtain four CNT / ANF aqueous dispersions with different CNT contents; wherein, in the four CNT / ANF aqueous dispersions with different CNT contents, the mass fraction of CNT relative to ANF was 0.125 wt.%, 0.25 wt.%, 0.375 wt.%, and 0.5 wt.%, respectively.

[0034] Step 3: Combine any two CNT / ANF aqueous dispersions with different CNT contents to obtain several combinations of CNT / ANF aqueous dispersions with different CNT contents.

[0035] Step 4: Combine several groups of CNT / ANF aqueous dispersions with different CNT contents, arrange them in a rectangular array, and perform vacuum-assisted filtration to obtain CNT / ANF matrix composite gel.

[0036] Step 5: Vacuum dry the CNT / ANF matrix composite gel at 110℃ for 10 min to obtain a CNT / ANF array film. The CNT / ANF array film comprises several arrayed CNT / ANF combination sites, each CNT / ANF combination site including two CNT / ANF patterned sites with different CNT contents. Specifically, a CNT / ANF patterned site with a CNT to ANF mass fraction of 0.125 wt.% is denoted as 0.12. 5 CNT / ANF pattern point; a CNT / ANF pattern point with a CNT to ANF mass fraction of 0.25 wt.% is denoted as 0.250 CNT / ANF pattern point; a CNT / ANF pattern point with a CNT to ANF mass fraction of 0.375 wt.% is denoted as 0.375 CNT / ANF pattern point; a CNT / ANF pattern point with a CNT to ANF mass fraction of 0.5 wt.% is denoted as 0.500 CNT / ANF pattern point.

[0037] As attached Figure 1 As shown, attached Figure 1 Optical photographs of the CNT / ANF array thin film prepared in Example 1 are shown in the appendix; Figure 1 As can be seen, the array pattern composed of CNT / ANF with different CNT contents is clear and uniform in size.

[0038] Step 6: Within the wavelength range of 400-800 nm, measure the transmittance of the CNT / ANF pattern points located in the right region of each CNT / ANF combination site, and obtain the transmittance curve of the CNT / ANF pattern points located in the right region of each CNT / ANF combination site, as shown in the attached figure. Figure 2 As shown; from the appendix Figure 2 As can be seen, within the wavelength range of 400-800nm, the transmittance curve of the CNT / ANF pattern dots in the right region exhibits a linear distribution, and the transmittance of the CNT / ANF pattern dots decreases with the increase of CNT content.

[0039] Step 7: Based on the transmittance curve of the CNT / ANF pattern point located in the right region of each CNT / ANF combination point, determine the wavelength data corresponding to the CNT / ANF pattern point located in the right region of each CNT / ANF combination point when the preset transmittance T0 is 6%; wherein, the wavelength corresponding to the 0.125 CNT / ANF pattern point is 503nm, the wavelength corresponding to the 0.250 CNT / ANF pattern point is 548nm, the wavelength corresponding to the 0.375 CNT / ANF pattern point is 589nm, and the wavelength corresponding to the 0.500 CNT / ANF pattern point is 696nm.

[0040] Step 8: Based on the preset transmittance T0 of 6%, measure the transmittance of the CNT / ANF pattern points located in the right region of each CNT / ANF combination point, and obtain the transmittance data of the CNT / ANF pattern points located in the left region of each CNT / ANF combination point.

[0041] The correspondence between the transmittance data and wavelength data of the CNT / ANF pattern points located in the left region of each CNT / ANF combination point is shown in the attached figure. Figure 3 As shown; Appendix Figure 3 The table provides a correspondence between the transmittance data and wavelength data of the CNT / ANF pattern points located in the left region of each CNT / ANF combination point. The columns are arranged in descending order of transmittance at 800nm, and the rows are arranged in ascending order of wavelength data corresponding to the CNT / ANF pattern points with a preset transmittance T0 of 6%. The transmittance data of the CNT / ANF pattern points located in the left region of each CNT / ANF combination point are distributed in the data cells of the table corresponding to the transmittance data and wavelength data.

[0042] Step 9: Arrange the transmittance data of all CNT / ANF pattern points in the left area of ​​all CNT / ANF combination points in ascending order according to the value of the transmittance data; then, remove the maximum, minimum and transmittance data that are equal to the preset transmittance T0 to obtain the transmittance sequence.

[0043] Step 10: Encode the transmittance sequence according to the preset coding rules to obtain code 1, as shown in the attached figure. Figure 4 As shown.

[0044] Step 11: Using the preset key, transcode number 1 to obtain code 2, as shown in the attached figure. Figure 5 As shown.

[0045] Step 12: Using the GB2312-80 Simplified Chinese character set, decode encoding 2 to obtain the encrypted ciphertext, as shown in the attached image. Figure 6 As shown.

[0046] Performance testing: The CNT / ANF array film prepared in Example 1 was tested for its information encryption and decryption effects, and the test results are as follows: The prepared CNT / ANF array film has a uniform structure and stable light transmittance. Among them, at a wavelength of 800 nm, the light transmittance of the 0.125 CNT / ANF pattern dots is 26.9%, the light transmittance of the 0.250 CNT / ANF pattern dots is 20.9%, the light transmittance of the 0.375 CNT / ANF pattern dots is 15.2%, and the light transmittance of the 0.500 CNT / ANF pattern dots is 8.3%. After encoding and transcoding, the Chinese characters corresponding to the ciphertext in the CNT / ANF array film are "powder", "alley", "wine" and "pick up".

[0047] Example 2 The preparation method and application of the CNT / ANF array film provided in this Example 2 are basically the same as the principle and process of the above Example 1, except that: In step 2, the ANF / DMSO dispersion liquid was subjected to protonation treatment with a mass fraction of 0.2 wt.%, and four different CNT / ANF aqueous dispersions with different CNT contents were obtained. Among them, in the four different CNT / ANF aqueous dispersions, the mass fraction of CNT compared to ANF is 0.05 wt.%, 0.1 wt.%, 0.125 wt.% and 0.375 wt.% in sequence.

[0048] In step 7, based on the light transmittance curve of the CNT / ANF pattern dots in the right region of each CNT / ANF combination point, when the preset light transmittance T0 is 8%, the wavelength data corresponding to the CNT / ANF pattern dots in the right region of each CNT / ANF combination point is determined. Among them, the wavelength corresponding to the 0.050 CNT / ANF pattern dots is 471 nm, the wavelength corresponding to the 0.100 CNT / ANF pattern dots is 511 nm, the wavelength corresponding to the 0.125 CNT / ANF pattern dots is 559 nm, and the wavelength corresponding to the 0.375 CNT / ANF pattern dots is 605 nm.

[0049] The remaining steps are basically the same and will not be elaborated here.

[0050] Performance testing: The CNT / ANF array film prepared in Example 2 was tested for its information encryption and decryption effects, and the test results are as follows: The prepared CNT / ANF array film has a uniform structure and stable light transmittance. Among them, at a wavelength of 800 nm, the light transmittance of the 0.050 CNT / ANF pattern dots is 31.2%, the light transmittance of the 0.100 CNT / ANF pattern dots is 28.7%, the light transmittance of the 0.125 CNT / ANF pattern dots is 26.9%, and the light transmittance of the 0.375 CNT / ANF pattern dots is 15.2%. After encoding and transcoding, the Chinese characters corresponding to the ciphertext in the CNT / ANF array film are "Han", "Ou", "Pang", and "Kai".

[0051] Example 3 The preparation method and application of a CNT / ANF array film provided in this Example 3 are basically the same as the principle and process of the above Example 1, except that: In step 2, the ANF / DMSO dispersion liquid was subjected to protonation treatment with a mass fraction of 0.2 wt.%, and four different CNT / ANF aqueous dispersion liquids with different CNT contents were obtained. Among them, in the four different CNT / ANF aqueous dispersion liquids, the mass fraction of CNT compared to ANF is 0 wt.%, 0.25 wt.%, 0.5 wt.%, and 0.725 wt.% in sequence.

[0052] In step 7, based on the light transmittance curve of the CNT / ANF pattern dots in the right region of each CNT / ANF combination point, the wavelength data corresponding to the CNT / ANF pattern dots in the right region of each CNT / ANF combination point was determined under a preset light transmittance T0 of 5%. Among them, the wavelength corresponding to the 0.000 CNT / ANF pattern dots is 507 nm, the wavelength corresponding to the 0.250 CNT / ANF pattern dots is 576 nm, the wavelength corresponding to the 0.500 CNT / ANF pattern dots is 611 nm, and the wavelength corresponding to the 0.725 CNT / ANF pattern dots is 683 nm.

[0053] The remaining steps are basically the same and will not be elaborated here.

[0054] Performance testing: The CNT / ANF array film prepared in Example 3 was tested for its information encryption and decryption effects, and the test results are as follows: The prepared CNT / ANF array film has a uniform structure and stable light transmittance. Among them, at a wavelength of 800 nm, the light transmittance of the 0.000 CNT / ANF pattern points is 33.9%, the light transmittance of the 0.250 CNT / ANF pattern points is 20.9%, the light transmittance of the 0.500 CNT / ANF pattern points is 8.3%, and the light transmittance of the 0.725 CNT / ANF pattern points is 6.5%. After encoding and transcoding, the Chinese characters corresponding to the ciphertext in the CNT / ANF array film are "珂", "韩", "钠", and "栖".

[0055] Example 4 The preparation method and application of the CNT / ANF array film provided in this Example 4 are basically the same as the principle and process of the above Example 1, except that: In step 2, the ANF / DMSO dispersion liquid with a mass fraction of 0.2 wt.% was subjected to proton reduction treatment to obtain four different CNT / ANF aqueous dispersions with different CNT contents. Among them, in the four different CNT / ANF aqueous dispersions, the mass fraction of CNT compared to ANF is 0.375 wt.%, 0.5 wt.%, 0.65 wt.%, and 0.725 wt.% in sequence.

[0056] In step 7, based on the light transmittance curve of the CNT / ANF pattern points in the right region of each CNT / ANF combination point, the wavelength data corresponding to the CNT / ANF pattern points in the right region of each CNT / ANF combination point was determined at a preset light transmittance T0 of 10%. Among them, the wavelength corresponding to the 0.375 CNT / ANF pattern points is 528 nm, the wavelength corresponding to the 0.500 CNT / ANF pattern points is 587 nm, the wavelength corresponding to the 0.650 CNT / ANF pattern points is 655 nm, and the wavelength corresponding to the 0.725 CNT / ANF pattern points is 723 nm.

[0057] The remaining steps are basically the same and will not be elaborated here.

[0058] Performance testing: The CNT / ANF array film prepared in Example 4 was tested for its information encryption and decryption effects, and the test results are as follows: The prepared CNT / ANF array film has a uniform structure and stable light transmittance. Among them, at a wavelength of 800 nm, the light transmittance of the 0.375 CNT / ANF pattern dots is 15.2%, the light transmittance of the 0.500 CNT / ANF pattern dots is 8.3%, the light transmittance of the 0.650 CNT / ANF pattern dots is 7.4%, and the light transmittance of the 0.725 CNT / ANF pattern dots is 6.5%. After encoding and transcoding, the Chinese characters corresponding to the ciphertext in the CNT / ANF array film are "Qi", "Ba", "Da", and "Fa".

[0059] Example 5 The preparation method and application of the CNT / ANF array film provided in this Example 5 are basically the same as the principles and processes of the above Example 1, except that: In step 2, the ANF / DMSO dispersion liquid was protonated with a mass fraction of 0.2 wt.%, and four kinds of CNT / ANF aqueous dispersions with different CNT contents were obtained. Among them, in the four kinds of CNT / ANF aqueous dispersions with different CNT contents, the mass fraction of CNT compared to ANF is 0.1 wt.%, 0.25 wt.%, 0.5 wt.%, and 0.725 wt.% in sequence.

[0060] In step 7, based on the light transmittance curve of the CNT / ANF pattern dots in the right region of each CNT / ANF combination point, the wavelength data corresponding to the CNT / ANF pattern dots in the right region of each CNT / ANF combination point was determined under the preset light transmittance T0 of 6%. Among them, the wavelength corresponding to the 0.100 CNT / ANF pattern dots is 474 nm, the wavelength corresponding to the 0.250 CNT / ANF pattern dots is 548 nm, the wavelength corresponding to the 0.500 CNT / ANF pattern dots is 689 nm, and the wavelength corresponding to the 0.725 CNT / ANF pattern dots is 715 nm.

[0061] The remaining steps are basically the same and will not be elaborated here.

[0062] Performance testing: The CNT / ANF array film prepared in Example 5 was tested for its information encryption and decryption effects, and the test results are as follows: The prepared CNT / ANF array film has a uniform structure and stable light transmittance. Among them, at a wavelength of 800 nm, the light transmittance of the 0.100 CNT / ANF pattern dots is 28.7%, the light transmittance of the 0.250 CNT / ANF pattern dots is 20.9%, the light transmittance of the 0.500 CNT / ANF pattern dots is 8.3%, and the light transmittance of the 0.725 CNT / ANF pattern dots is 6.5%. After encoding and transcoding, the Chinese characters corresponding to the ciphertext in the CNT / ANF array film are "Fan", "Ke", "La", and "Pa".

[0063] Example 6 The preparation method and application of the CNT / ANF array film provided in this Example 6 are basically the same as the principle and process of the above Example 1, except that: In Step 2, the ANF / DMSO dispersion liquid was subjected to protonation treatment with a mass fraction of 0.2 wt.%, and four CNT / ANF aqueous dispersions with different CNT contents were obtained. Among them, in the four CNT / ANF aqueous dispersions with different CNT contents, the mass fraction of CNT compared to ANF is 0.05 wt.%, 0.125 wt.%, 0.375 wt.%, and 0.65 wt.% in sequence.

[0064] In Step 7, based on the light transmittance curve of the CNT / ANF pattern dots in the right region of each CNT / ANF combination point, the preset light transmittance T0 was determined to be 5%, and the wavelength data corresponding to the CNT / ANF pattern dots in the right region of each CNT / ANF combination point was determined. Among them, the wavelength corresponding to the 0.050 CNT / ANF pattern dots is 469 nm, the wavelength corresponding to the 0.125 CNT / ANF pattern dots is 516 nm, the wavelength corresponding to the 0.375 CNT / ANF pattern dots is 569 nm, and the wavelength corresponding to the 0.650 CNT / ANF pattern dots is 703 nm.

[0065] The remaining steps are basically the same and will not be elaborated here.

[0066] Performance testing: The CNT / ANF array film prepared in Example 6 was tested for its information encryption and decryption effects, and the test results are as follows: The prepared CNT / ANF array film has a uniform structure and stable light transmittance. Among them, at a wavelength of 800 nm, the light transmittance of the 0.050 CNT / ANF pattern points is 31.2%, the light transmittance of the 0.125 CNT / ANF pattern points is 26.9%, the light transmittance of the 0.375 CNT / ANF pattern points is 15.2%, and the light transmittance of the 0.650 CNT / ANF pattern points is 7.4%. After encoding and transcoding, the Chinese characters corresponding to the ciphertext in the CNT / ANF array film are "Xi", "Zai", "Ran", and "Nan".

[0067] Example 7 The preparation method and application of the CNT / ANF array film provided in this Example 7 are basically the same as the principles and processes of the above Example 1, except that: In step 2, the ANF / DMSO dispersion was subjected to re-protonation treatment with a mass fraction of 0.2 wt.%, and four kinds of CNT / ANF aqueous dispersions with different CNT contents were obtained. Among the four kinds of CNT / ANF aqueous dispersions with different CNT contents, the mass fraction of CNT compared to ANF is 0.1 wt.%, 0.375 wt.%, 0.5 wt.%, and 0.725 wt.% in sequence.

[0068] In step 7, based on the light transmittance curve of the CNT / ANF pattern points in the right region of each CNT / ANF combination point, the preset light transmittance T0 was determined to be 8%, and the wavelength data corresponding to the CNT / ANF pattern points in the right region of each CNT / ANF combination point were determined. Among them, the wavelength corresponding to the 0.100 CNT / ANF pattern points is 529 nm, the wavelength corresponding to the 0.375 CNT / ANF pattern points is 646 nm, the wavelength corresponding to the 0.500 CNT / ANF pattern points is 736 nm, and the wavelength corresponding to the 0.725 CNT / ANF pattern points is 783 nm.

[0069] The remaining steps are basically the same and will not be elaborated here.

[0070] Performance testing: The CNT / ANF array film prepared in Example 7 of this embodiment and its information encryption and decryption effects were detected, and the detection results are as follows: The prepared CNT / ANF array film has a uniform structure and stable light transmittance; among them, at a wavelength of 800 nm, the light transmittance of the 0.100 CNT / ANF pattern points is 28.7%, the light transmittance of the 0.375 CNT / ANF pattern points is 15.2%, the light transmittance of the 0.500 CNT / ANF pattern points is 8.3%, and the light transmittance of the 0.725 CNT / ANF pattern points is 6.5%; after encoding and transcoding, the Chinese characters corresponding to the ciphertext in the CNT / ANF array film are "Ji", "Cai", "A", and "Wu".

[0071] The CNT / ANF array film, its preparation method and application described in the present invention use ANF as the matrix to prepare a CNT / ANF array film containing pattern points with different CNT contents distributed in an array and each point; adjust the optical properties by CNT, and encrypt and decrypt information through a double sequence and two transcoding operations; specifically, by preparing a CNT / ANF array film containing pattern points with different CNT contents distributed in an array, and using a specific wavelength range to measure the light transmittance of the pattern points, data processing, encoding transcoding and decoding operations are performed to achieve information encryption or decryption.

[0072] In the present invention, by using the optical properties of the CNT / ANF film and the light transmittance sorting rule, the secondary encryption of numbers and letters can be combined to hide the ciphertext in the pattern composed of polymers, which improves the security and accuracy of Chinese characters in the encryption and decryption processes; compared with the traditional encryption forms that use numbers, letters or characters as carriers and have greater security risks, it realizes the encryption and decryption of information by virtue of the unique physical properties of the film, greatly improving the complexity and security of information encryption, and providing a more effective means for guarding the information security defense line.

[0073] The above embodiments are only one of the implementation manners that can implement the technical solution of the present invention. The scope of protection required by the present invention is not limited only by this embodiment, but also includes any changes, substitutions and other implementation manners that are easily conceivable by those skilled in the art within the technical scope disclosed by the present invention.

Claims

1. A method for preparing a CNT / ANF array thin film, characterized in that, include: By combining any two CNT / ANF aqueous dispersions with different CNT contents, several combinations of CNT / ANF aqueous dispersions with different CNT contents can be obtained. Several groups of CNT / ANF aqueous dispersions with different CNT contents were combined and arranged in a rectangular array, and then vacuum-assisted filtration was performed to obtain CNT / ANF matrix composite gels. The CNT / ANF matrix composite gel is dried to obtain a CNT / ANF array film; wherein the CNT / ANF array film includes a number of CNT / ANF combination sites distributed in an array, and each CNT / ANF combination site includes two CNT / ANF pattern sites with different CNT contents.

2. The method for preparing a CNT / ANF array thin film according to claim 1, characterized in that, The preparation process of CNT / ANF aqueous dispersions with different CNT contents is as follows: ANF / DMSO dispersion was protonated using CNT aqueous dispersion to obtain several CNT / ANF aqueous dispersions with different CNT contents.

3. The method for preparing a CNT / ANF array thin film according to claim 2, characterized in that, The mass fraction of CNT in the aqueous dispersion is 0.2 wt.%; in several CNT / ANF aqueous dispersions with different CNT contents, the mass fraction of CNT relative to ANF is 0-0.725 wt.%.

4. A CNT / ANF array thin film, characterized in that, It was prepared using the method for preparing CNT / ANF array thin films as described in any one of claims 1-3.

5. The application of a CNT / ANF array thin film as described in claim 4, characterized in that, The CNT / ANF array film is used for information encryption or decryption.

6. The application of a CNT / ANF array thin film according to claim 5, characterized in that, The CNT / ANF array thin film is used in the process of information encryption or decryption, including: Within a preset wavelength range, the transmittance of one CNT / ANF pattern point in each CNT / ANF combination point is measured to obtain the transmittance curve of one CNT / ANF pattern point in each CNT / ANF combination point. Based on the transmittance curve of one CNT / ANF pattern point in each CNT / ANF combination point, determine the wavelength data corresponding to one CNT / ANF pattern point in each CNT / ANF combination point at the preset transmittance T0; Based on the wavelength data corresponding to one of the CNT / ANF pattern points in each CNT / ANF combination point under the preset transmittance T0, the transmittance of the other CNT / ANF pattern point in each CNT / ANF combination point is measured to obtain the transmittance data of the other CNT / ANF pattern point in each CNT / ANF combination point. Sort the transmittance data of another CNT / ANF pattern point in all CNT / ANF combination points, and remove the maximum, minimum and transmittance data that are equal to the preset transmittance T0 to obtain the transmittance sequence. The transmittance sequence is encoded according to the preset encoding rules to obtain code 1; Using a preset key, code 1 is transcoded to obtain code 2; Using a preset encoding table, decode encoding 2 to obtain the encrypted ciphertext.

7. The application of a CNT / ANF array thin film according to claim 6, characterized in that, The preset wavelength range is 400-800nm.

8. The application of a CNT / ANF array thin film according to claim 6, characterized in that, The preset transmittance T0 is 5%-10%.

9. The application of a CNT / ANF array thin film according to claim 6, characterized in that, The process of sorting the transmittance data of another CNT / ANF pattern point in all CNT / ANF combination points, and removing the maximum, minimum, and transmittance data equal to the preset transmittance T0, to obtain the transmittance sequence is as follows: Based on the magnitude of the transmittance data, arrange the transmittance data of the other CNT / ANF pattern point in all CNT / ANF combination points in ascending order; then, remove the maximum, minimum, and transmittance data that are equal to the preset transmittance T0 to obtain the transmittance sequence.

10. The application of a CNT / ANF array thin film according to claim 6, characterized in that, The default encoding table is a Chinese character encoding table.

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