Process for the preparation of photo / electro-dual-modulated color-changing fabrics

Abstract

The application provides a preparation method of photo / electro dual-modulation variable color fabric, which comprises the following steps: carrying out surface decontamination treatment on the fabric, drying the fabric for standby, preparing a sodium tungstate solution, adding oxalic acid, adding hydrochloric acid to adjust the pH value, stirring, then adding rare earth elements, continuously stirring in a light-shielded environment to obtain a mixed solution, putting the fabric and the mixed solution into a reaction kettle, taking out the fabric after hydrothermal reaction, cleaning and drying the fabric, and obtaining the photo / electro dual-modulation variable color fabric. The application adopts a hydrothermal method to synthesize variable color materials on the surface of the fabric, so that a film with photochromic and electrochromic capabilities is formed on the surface of the fabric, tungsten trioxide is used as a main electrochromic material, and the photochromic and electrochromic dual-modulation performance of the variable color fabric is realized by doping rare earth elements Nd and Eu. The variable color fabric prepared by the application has good flexibility and stable photo / electro dual-modulation performance, the flexible substrate makes the variable color fabric have potential wearable performance, and the variable color fabric can be used for future smart clothes and implantable display applications.

Description

Technical Field

[0001] This invention relates to the field of color-changing fabric technology, and more particularly to a method for preparing a photo- / electro-modulated color-changing fabric. Background Technology

[0002] In recent years, smart color-changing fabrics have become a research hotspot due to their potential applications in wearable displays, sensors, camouflage, anti-counterfeiting technology, and even the military industry. Traditionally, the color of fabrics prepared through dyeing and finishing techniques cannot be subtly changed. Therefore, recent research has focused on using novel methods to control the color changes of fibers or fabrics. Liu et al. controlled the size and number of layers of silica nanospheres through self-assembly in microspaces, thereby creating colored structural fibers that can change color; Laforgue et al. prepared a thermochromic fiber, achieving color change through resistance heating. However, these materials still have many drawbacks, such as long switching times, limited color changes, and high energy consumption.

[0003] Electrochromism refers to the phenomenon where optical properties undergo stable and reversible color changes under the influence of an applied electric field, manifesting as reversible changes in color and transparency. Photochromism is a chemical reaction in which a substance changes color after being exposed to light of a certain wavelength, and then reverts to its original state when exposed to light of a different wavelength or under the influence of heat or pressure. WO3 is an N-type semiconductor material with a bandgap of approximately 2.5–3.0 eV, a typical transition metal photochromic and electrochromic material. Furthermore, under optimal applied voltage, WO3 exhibits photochromic and electrochromic properties when containing H+. + Na + and Li + WO3 exhibits rapid on / off reversibility in positively charged electrolytes and is widely used in sensors, optoelectronic devices, and other fields. In recent years, research on WO3 has been increasing due to its ultraviolet absorption and photochromic properties. WO3 has enormous potential applications in data displays, optical processors, information storage devices, military camouflage, smart windows, and rearview mirrors. Therefore, among various color-changing technologies, achieving rapid and controllable adjustment of photochromism and electrochromism in a relatively simple manner is of great significance.

[0004] In view of this, it is necessary to design an improved photoluminescent / electroluminescent dual-modulation color-changing fabric to solve the above problems. Summary of the Invention

[0005] To address the shortcomings of the prior art, the present invention aims to provide a method for preparing photo- / electro-modulated dual-modulation color-changing fabric. This method is simple to synthesize, has low cost, fast color-changing switching rate, and stable cycle performance.

[0006] To achieve the above objectives, the present invention provides a method for preparing a photosensitive / electrosensitive dual-modulation color-changing fabric, comprising the following steps:

[0007] S1. Perform surface cleaning treatment on the fabric and dry it for later use;

[0008] S2. Prepare a sodium tungstate solution of a predetermined concentration by adding oxalic acid;

[0009] S3. Add hydrochloric acid to the solution obtained in step S2 to adjust the pH value, and stir for 20-30 minutes.

[0010] S4. Add rare earth elements to the solution obtained in step S3, and stir for 20-30 minutes under a light-proof environment to obtain a mixed solution;

[0011] S5. Place the fabric obtained in step S1 into the reaction vessel and fix it. Add the mixed solution prepared in step S4 into the reaction vessel. Perform a hydrothermal reaction for a predetermined time. After the reaction is completed, take out the fabric, wash it, and then heat and dry it in an oven to obtain a photoluminescent / electroluminescent dual-modulation color-changing fabric.

[0012] As a further improvement of the present invention, in step S1, the fabric is a conductive fabric, including hydrophilic carbon cloth, nickel-plated nylon cloth, stainless steel cloth, and nickel-plated cotton cloth.

[0013] Furthermore, in step S1, the surface cleaning treatment method is as follows: the fabric is soaked in acetone solution and sonicated for 20-30 minutes, then rinsed with deionized water and ethanol alternately 2-3 times, and the cleaned fabric is dried at 60°C for 4-6 hours for later use.

[0014] As a further improvement of the present invention, in step S2, the predetermined concentration of the sodium tungstate solution is 0.2 to 0.4 mol / L, and the amount of oxalic acid added accounts for 3 to 5 wt% of the sodium tungstate.

[0015] As a further improvement of the present invention, in step S3, the concentration of hydrochloric acid is 1 to 3 mol / L, and the pH value of the solution is controlled between 1 and 1.2.

[0016] As a further improvement of the present invention, in step S4, the rare earth element is one or both of neodymium and europium.

[0017] Furthermore, the rare earth element is added in the form of neodymium nitrate hexahydrate or europium nitrate hexahydrate.

[0018] Furthermore, the amount of rare earth elements added is 2-5 mol%.

[0019] As a further improvement of the present invention, in step S5, the reaction temperature of the hydrothermal reaction is 100-120°C and the reaction time is 5-10 hours.

[0020] Furthermore, in step S5, the cleaning method is to alternate between deionized water and ethanol, and the heating and drying conditions are to dry at 60°C for 4 to 6 hours.

[0021] The beneficial effects of this invention are:

[0022] (1) This invention provides a method for preparing a photochromic / electrochromic dual-modulation color-changing fabric. Tungsten trioxide is used as the main electrochromic material, and the photochromic and electrochromic dual-modulation properties of the color-changing fabric are achieved by doping with different types and amounts of rare earth elements such as Eu and Nd. This invention uses a flexible conductive fabric as the substrate and employs a hydrothermal method to synthesize the color-changing material on the surface of the conductive fabric, forming a thin film with both photochromic and electrochromic capabilities on the fabric surface. After cleaning and drying, the photochromic / electrochromic dual-modulation color-changing fabric is obtained. This invention uses a flexible substrate to overcome the limitations of traditional electrochromic materials applied to rigid substrates, enabling bending, folding, and other operations while maintaining good performance.

[0023] (2) The color of the photochromic / electrochromic dual-modulation color-changing fabric of the present invention can change not only with different wavelengths of light, but also with changes in voltage, exhibiting obvious color changes and good cycle stability. Specifically, when photochromic modulation is used: after irradiating the color-changing fabric with a 365nm ultraviolet lamp for 1-3 minutes, the color-changing layer on the fabric surface can change from grayish-white to bluish-black; after irradiating the colored fabric with an 800-1500nm infrared lamp for about 10 minutes, the fabric surface color returns to a grayish-white state. When electrochromic modulation is used: applying a -2.5V voltage to the color-changing fabric, the fabric color can change from grayish-white to bluish-black in just 4 seconds; after applying a +2.5V voltage for 4.3 seconds, the color can return to bluish-gray, and after irradiating with an infrared lamp for about 5 minutes, the color completely returns to grayish-white. Thus, a color-changing fabric with photochromic / electrochromic dual modulation is realized.

[0024] (3) This invention uses a hydrothermal method to synthesize the color-changing layer, which is simple to operate and has a low cost. By adding rare earth elements to the reaction system and reacting them with sodium tungstate, the synthesized color-changing layer has photochromic and electrochromic dual modulation properties. In the preparation of the color-changing layer, rare earth element crystals are added, which interact with the synthesized WO3 under hydrothermal conditions to enhance the photochromic properties of WO3, while not changing the electrochromic properties of WO3.

[0025] (4) In this invention, Nd element has the most significant effect on improving the photochromic properties of WO3. When 2 mol% of Nd(NO3)3·6H2O is added to the system, the morphology of the photochromic layer on the fiber changes from a spherical structure of WO3 to a loose granular structure, which is beneficial to the photoparticle / H + The absorption or deintercalation of Nd+ allows the color-changing fabric to exhibit excellent photo- / electro-modulated dual properties.3+ The ionic radius is much larger than W. 6+ The ionic radius of Nd increases with doping concentration up to 5 mol%. 3+ The Nd+ has gradually occupied all the voids in the internal structure of hexagonal WO3. The higher the doping concentration, the smaller the increase in the Nd+ to W ratio, indicating that Nd+ has gradually become more abundant in the WO3 hexagonal phase. 3+ The doping has gradually approached saturation. Meanwhile, the light-shielding conditions ensure that rare earth elements are not affected by external light during the preparation of the precursor solution, thus preventing changes in their properties. Attached Figure Description

[0026] Figure 1 This is a SEM image of the photo- / electro-modulated dual-modulation color-changing fabric synthesized in Example 1.

[0027] Figure 2 This is a SEM image of the photo- / electro-modulated dual-modulation color-changing fabric synthesized in Example 2.

[0028] Figure 3 This is a SEM image of the photo- / electro-modulated dual-modulation color-changing fabric synthesized in Example 3.

[0029] Figure 4 This is a SEM image of the photo- / electro-modulated dual-modulation color-changing fabric synthesized in Example 4.

[0030] Figure 5 The image shows a SEM image of the photo- / electro-modulated dual-modulation color-changing fabric synthesized in Comparative Example 1.

[0031] Figure 6 The image shows a SEM image of the photo- / electro-modulated dual-modulation color-changing fabric synthesized in Comparative Example 2.

[0032] Figure 7 The image shows a SEM image of the photo- / electro-modulated dual-modulation color-changing fabric synthesized in Comparative Example 3.

[0033] Figure 8 The cyclic voltammetry curves are those of the photo- / electro-modulated dual-modulation color-changing fabric synthesized in Example 1.

[0034] Figure 9 The cyclic voltammetry curves are those of the photo- / electro-modulated dual-modulation color-changing fabric synthesized in Example 3.

[0035] Figure 10 The time-current curves of the photo- / electro-modulated dual-modulation color-changing fabric synthesized in Example 1 are shown.

[0036] Figure 11 The images show the UV-Vis reflectance spectra of the photo- / electro-modulated dual-modulation color-changing fabric synthesized in Example 1 after exposure to light at different wavelengths in its colored and bleached states. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0038] It should also be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures and / or processing steps closely related to the present invention are shown in the accompanying drawings, while other details that are not closely related to the present invention are omitted.

[0039] Additionally, it should be noted that the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0040] This invention provides a method for preparing a photosensitive / electrosensitive dual-modulation color-changing fabric, comprising the following steps:

[0041] S1. Perform surface cleaning treatment on the fabric and dry it for later use.

[0042] Specifically, the conductive fabrics selected include, but are not limited to, flexible substrates such as hydrophilic carbon cloth, nickel-plated nylon cloth, stainless steel cloth, and nickel-plated cotton cloth; the surface cleaning treatment method for the fabric is as follows: immerse the fabric in acetone solution and sonicate for 20-30 minutes, then rinse it with deionized water and ethanol alternately 2-3 times, and dry the cleaned fabric at 60℃ for 4-6 hours for later use.

[0043] S2. Prepare a sodium tungstate solution of a predetermined concentration by adding oxalic acid.

[0044] Specifically, the concentration of the sodium tungstate solution is 0.2–0.4 mol / L, the solvent used is deionized water, and the amount of oxalic acid added is 3–5 wt% of the sodium tungstate.

[0045] S3. Add hydrochloric acid to the solution obtained in step S2 to adjust the pH value, and stir for 20-30 minutes.

[0046] Specifically, add hydrochloric acid with a concentration of 1-3 mol / L to the solution obtained in S2, control the pH value of the solution to 1-1.2, and stir for 20-30 minutes.

[0047] S4. Add rare earth elements to the solution obtained in step S3, and stir for 20-30 minutes under a light-proof environment to obtain a mixed solution.

[0048] Specifically, rare earth elements are added to the solution obtained in step S3. The rare earth elements are preferably one or both of neodymium and europium, added in the form of neodymium nitrate hexahydrate (Nd(NO3)3·6H2O) or europium nitrate hexahydrate (Eu(NO3)3·6H2O). The amount added is 2-5 mol% of the solution obtained in step S3. The mixture is stirred for 20-30 min under a light-proof environment to obtain a mixed solution.

[0049] In the above steps, more preferably, the rare earth element is neodymium, which is added in the form of neodymium nitrate hexahydrate.

[0050] S5. Place the fabric obtained in step S1 into the reaction vessel and fix it. Add the mixed solution prepared in step S4 into the reaction vessel. Perform a hydrothermal reaction for a predetermined time. After the reaction is completed, take out the fabric, wash it, and then heat and dry it in an oven to obtain a photoluminescent / electroluminescent dual-modulation color-changing fabric.

[0051] Specifically, the fabric obtained in step S1 is vertically placed into the liner of a polytetrafluoroethylene reactor and fixed. The mixed solution prepared in step S4 is added to the liner of the reactor. The hydrothermal reaction conditions are a reaction temperature of 100-120℃ and a reaction time of 5-10h. After the reaction is completed, the fabric is washed alternately with deionized water and ethanol and then dried in an oven at 60℃ for 4-6h to obtain a photoluminescent / electroluminescent dual-modulation color-changing fabric.

[0052] The preparation method of the photo- / electro-modulated dual-modulation color-changing fabric provided by the present invention will be described below with reference to specific embodiments.

[0053] Example 1

[0054] Example 1 provides a method for preparing a photosensitive / electrosensitive dual-modulation color-changing fabric, comprising the following steps:

[0055] S1. Select a 2×2cm hydrophilic carbon cloth, soak it in acetone solution and sonicate for 20 minutes. After taking it out, rinse it three times alternately with deionized water and ethanol. Dry the cleaned fabric at 60℃ for 6 hours for later use.

[0056] S2. Prepare a sodium tungstate solution with a concentration of 0.2 mol / L using deionized water, add 3 wt% oxalic acid, and stir for 5 min;

[0057] S3. Add 3 mol / L hydrochloric acid to the solution obtained in step S2, control the pH value of the solution to 1.2, and stir for 30 min;

[0058] S4. Add 2 mol% of neodymium nitrate hexahydrate (Nd(NO3)3·6H2O) to the solution obtained in step S3, and stir for 20 min under a light-proof environment to obtain a mixed solution;

[0059] S5. The fabric obtained in step S1 is vertically placed into the liner of a polytetrafluoroethylene reactor and fixed. The mixed solution prepared in step S4 is added to the liner. The mixture is hydrothermally reacted at 120°C for 5 hours. After the reaction is completed, the fabric is washed alternately with deionized water and ethanol and then dried in an oven at 60°C for 6 hours to obtain a fabric with photoluminescence / electroluminescence dual modulation color change.

[0060] Please see Figure 1 The image shown is a SEM image of the photochromic / electrochromic dual-modulation color-changing fabric synthesized in Example 1 with the addition of 2 mol% neodymium nitrate hexahydrate. The image shows that the carbon fiber surface is uniformly covered with a color-changing layer, but the structure is a loosely stacked nanoparticle structure. Therefore, it is conducive to photon absorption during photochromism; when absorbing ultraviolet light energy, the fabric becomes distinctly colored, and when absorbing infrared light energy, it fades. In the electrochromic test, this structure is H... + The interpenetration provides more ion channels, thus significantly increasing the color change rate.

[0061] Example 2

[0062] Example 2 provides a method for preparing a photo- / electro-modulated dual-modulation color-changing fabric. The difference from Example 1 is that 5 mol% of neodymium nitrate hexahydrate is added. Other parameters and conditions are the same as in Example 1 and will not be repeated here.

[0063] Please see Figure 2 The image shown is a SEM image of the photo- / electro-modulated color-changing fabric synthesized in Example 2 with the addition of 5 mol% Nd23 nitrate hexahydrate. As the doping concentration increases to 5 mol%, Nd23 nitrate... 3+ The Nd+ has gradually occupied all the voids in the internal structure of hexagonal WO3. The higher the doping concentration, the smaller the increase in the Nd+ to W ratio, indicating that Nd+ has gradually become more abundant in the WO3 hexagonal phase. 3+ The doping has gradually approached saturation, and SEM shows a relatively dense film structure. Although the color-changing fabric can still achieve photochromism, its electrochromic performance is affected, and the color-changing time increases.

[0064] Example 3

[0065] Example 3 provides a method for preparing a photo- / electro-modulated dual-modulation color-changing fabric. Compared with Example 1, the difference is that in step S4, 2 mol% neodymium nitrate hexahydrate is replaced with 2 mol% europium nitrate hexahydrate. Other parameters and conditions are the same as in Example 1, and will not be repeated here.

[0066] Please see Figure 3The image shown is a SEM image of the photosensitive / electrosensitive dual-modulation color-changing fabric synthesized in Example 3 with the addition of 2 mol% europium nitrate hexahydrate. Compared with Example 1, the addition of Eu(NO3)3·6H2O disrupted the structure of the WO3 layer, resulting in fewer nanoparticles growing on the fiber surface and forming a thinner color-changing layer. Although photosensitive color changing can still be achieved, its color-changing performance is weaker and not significantly different from that of Example 1.

[0067] Example 4

[0068] Example 4 provides a method for preparing a photoluminescent / electroluminescent dual-modulation color-changing fabric. Compared with Example 1, the difference is that in step S4, 2 mol% of neodymium nitrate hexahydrate and 2 mol% of europium nitrate hexahydrate are added. Other parameters and conditions are the same as in Example 1, and will not be repeated here.

[0069] Please see Figure 4 The image shown is a SEM image of the photo / electro-modulated dual-modulation color-changing fabric prepared in Example 4 with the addition of 2 mol% europium nitrate hexahydrate and 2 mol% neodymium nitrate hexahydrate. Compared with Example 1, the addition of Eu(NO3)3·6H2O causes the morphology of the color-changing layer to become a particle-attached structure with a thin film substrate. The ion transport capability of the film is weaker, and therefore its photo / electro-modulation capability is also weaker than that of the color-changing fabric in Example 1.

[0070] Comparative Example 1

[0071] Comparative Example 1 provides a method for preparing a photo- / electro-modulated dual-modulation color-changing fabric. The difference from Example 1 is that in step S4, after adding 2 mol% of neodymium nitrate hexahydrate, the mixture is stirred for 30 min without any light-shielding treatment. Other parameters and conditions are the same as in Example 1 and will not be repeated here.

[0072] Please see Figure 5 The image shows a SEM image of the photosensitive / electrosensitive dual-modulation color-changing fabric synthesized in Comparative Example 1 with 2 mol% neodymium nitrate hexahydrate added and stirred without light shielding. Due to the high sensitivity of rare earth elements to light, the image shows that without light shielding, the Nd(NO3)3·6H2O added during solution preparation easily deteriorates in a light-exposed environment, resulting in fewer and more scattered particles adhering to the fibers, thus making the color change less noticeable.

[0073] Comparative Example 2

[0074] Comparative Example 2 provides a method for preparing a photosensitive / electrosensitive dual-modulation color-changing fabric. Compared with Example 1, the difference is that the hydrothermal reaction time is increased to 12 hours. Other parameters and conditions are the same as in Example 1, and will not be repeated here.

[0075] Please see Figure 6The image shows a SEM image of the photosensitive / electrosensitive dual-modulation color-changing fabric synthesized in Comparative Example 2 when the hydrothermal reaction time was increased to 12 h. The image shows that increasing the hydrothermal reaction time did not change the effect of Nd(NO3)3·6H2O on the reaction system; the structure and morphology of the fabric fiber surface were the same as in Example 1. Therefore, choosing a shorter reaction time can save time and improve reaction efficiency.

[0076] Comparative Example 3

[0077] Comparative Example 3 provides a method for preparing a photo- / electro-modulated dual-modulation color-changing fabric. The difference from Example 1 is that neodymium nitrate hexahydrate is not added in step S4. Other parameters and conditions are the same as in Example 1, and will not be repeated here.

[0078] Please see Figure 7 The image shows a SEM image of the photochromic / electrochromic dual-modulation color-changing fabric synthesized in Comparative Example 3 without any dopants. As can be seen from the image, pure WO3 has regular nanoparticles with a smooth surface aggregated into a dense spherical structure. The pure WO3 layer can serve as an electrochromic layer with good electrochromic properties, but its photochromic properties are very poor, and it cannot be faded by simple light exposure.

[0079] Please see Figure 8 The figure shows the cyclic voltammetry curves of the photochromic / electrochromic dual-modulation color-changing fabric prepared by adding 2 mol% neodymium nitrate hexahydrate in Example 1. The figure shows the reduction peak at -0.2 V and the oxidation peak at 0.2 V of the color-changing layer, indicating that the structure of the color-changing layer is stable and mainly exhibits the redox peaks of WO3. Therefore, its electrochromic ability is mainly determined by the WO3 layer. Under negative voltage, it exhibits a colored state (blue-black) and under positive voltage, it reverts to a bleached state (blue-gray).

[0080] Please see Figure 9 The figure shows the cyclic voltammetry curves of the photochromic / electrochromic dual-modulation color-changing fabric prepared in Example 3 with the addition of 2 mol% europium nitrate hexahydrate. These curves demonstrate that the color change of the color-changing fabric can be achieved by altering the redox state of the electrochromic material. The color-changing layer doped with Eu(NO3)3·6H2O also exhibits a certain degree of electrochromic capability, but the maximum current density of the color-changing fabric is only 3 mA / cm². 2 This is lower than the fabric current density of 6.8 mA / cm² in Example 1. 2 This indicates that its charge storage capacity is poor and the structure of the membrane is not as stable as that in Example 1.

[0081] Please see Figure 10The figure shows the chronoamperometry curve of the photo- / electro-modulated dual-modulation color-changing fabric prepared in Example 1. This curve illustrates the color-changing time of the fabric in both the reduced and oxidized states. The figure shows a coloring time of 4.0 s and a bleaching time of 4.3 s. The rapid and sensitive color switching time is attributed to the loosely packed nanoparticle structure on the surface of the color-changing fabric, which is H... + The transmission provides more channels, improving H + The embedding and detachment rates of the color-changing layer. This indicates that the color-changing fabric prepared in this embodiment has a relatively fast color switching rate in the electrochromic test.

[0082] Please see Figure 11 The figure shows the UV-Vis reflectance spectra of the photochromic / electrochromic dual-modulation color-changing fabric prepared in Example 1 after irradiation with light at different wavelengths in its colored and bleached states. As can be seen from the figure, the maximum contrast ΔR = 35% is observed at 440 nm, indicating that the colored state after UV irradiation and the bleached state after infrared irradiation have significant optical contrast, demonstrating its obvious photochromic ability.

[0083] In summary, the method for preparing photo- / electro-modulated color-changing fabric provided by this invention is simple to operate and has low cost. By adding rare earth elements to the reaction system and reacting them with sodium tungstate, the synthesized color-changing layer exhibits photo- / electro-modulated properties.

[0084] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A method for preparing a photosensitive / electrosensitive dual-modulation color-changing fabric, characterized in that... This includes the following steps: S1. Perform surface cleaning treatment on the fabric and dry it for later use; the fabric is a conductive fabric. S2. Prepare a sodium tungstate solution of a predetermined concentration by adding oxalic acid; the predetermined concentration of the sodium tungstate solution is 0.2~0.4 mol / L, and the amount of oxalic acid added is 3~5 wt% of the sodium tungstate. S3. Add hydrochloric acid to the solution obtained in step S2 to adjust the pH value, and stir for 20-30 minutes; the concentration of the hydrochloric acid is 1-3 mol / L, and the pH value of the solution is controlled at 1-1.2; S4. Add rare earth elements to the solution obtained in step S3, and stir for 20-30 minutes under a light-shielded environment to obtain a mixed solution; the rare earth element is neodymium; the rare earth element is added in the form of neodymium nitrate hexahydrate; the amount of rare earth element added is 2 mol%. S5. Place the fabric obtained in step S1 into the reaction vessel and fix it. Add the mixed solution prepared in step S4 into the reaction vessel. Perform a hydrothermal reaction for a predetermined time to form a loose nanoparticle stacked structure on the surface of the fabric. After the reaction is completed, take out the fabric, wash it, and heat and dry it in an oven to obtain a photosensitive / electrosensitive dual-modulation color-changing fabric. The reaction temperature of the hydrothermal reaction is 100~120℃ and the reaction time is 5~10h.

2. The method for preparing photoluminescent / electroluminescent dual-modulation color-changing fabric according to claim 1, characterized in that, In step S1, the fabric includes hydrophilic carbon cloth, nickel-plated nylon cloth, stainless steel cloth, and nickel-plated cotton cloth.

3. The method for preparing photoluminescent / electroluminescent dual-modulation color-changing fabric according to claim 1, characterized in that, In step S1, the surface cleaning treatment method is as follows: the fabric is soaked in acetone solution and sonicated for 20-30 minutes, then rinsed with deionized water and ethanol alternately 2-3 times, and the cleaned fabric is dried at 60°C for 4-6 hours.

4. The method for preparing photoluminescent / electroluminescent dual-modulation color-changing fabric according to claim 1, characterized in that, In step S5, the cleaning method is to alternate between deionized water and ethanol, and the heating and drying conditions are to dry at 60°C for 4~6 hours.

Images