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CN-117406517-B - Wide spectrum stealth system based on electric drive

CN117406517BCN 117406517 BCN117406517 BCN 117406517BCN-117406517-B

Abstract

The invention relates to a broad spectrum stealth system based on electric drive. The wide spectrum stealth system based on electric driving comprises a substrate, a plurality of layers of composite electrodes, an electrochromic layer, a gel electrolyte layer and a transparent electrode which are sequentially stacked, wherein the plurality of layers of composite electrodes are composed of a first transparent semiconductor layer/a noble metal layer/a second transparent semiconductor layer.

Inventors

  • CAO XUN
  • HUANG AIBIN
  • XU FANG
  • JI XIAOWEI

Assignees

  • 中国科学院上海硅酸盐研究所

Dates

Publication Date
20260512
Application Date
20220707

Claims (11)

  1. 1. The wide spectrum stealth system based on electric drive is characterized by comprising a substrate, a multi-layer composite electrode, an electrochromic layer, a gel electrolyte layer and a transparent electrode which are sequentially stacked, wherein the multi-layer composite electrode consists of a first transparent semiconductor layer/a noble metal layer/a second transparent semiconductor layer; the gel electrolyte layer comprises a main body material and cationic salt distributed in the main body material, wherein the main body material is amino-terminated polyimide resin, and the molar ratio of the cationic salt to the amino-terminated polyimide resin is (2% -5%); The cation salt is selected from at least one of Al salt, li salt and Na salt, and the thickness of the gel electrolyte layer is 10-100 mu m.
  2. 2. The electrically driven broad spectrum stealth system of claim 1, wherein the substrate is a silicon substrate, a transparent glass substrate, or a metal substrate.
  3. 3. The electrically driven wide spectrum stealth system of claim 1, wherein the first transparent semiconductor layer and the second transparent semiconductor layer are independently selected from one of ITO, FTO and AZO, and the noble metal layer is selected from at least one of Ag, au, pt and Pd.
  4. 4. The electrically driven wide spectrum stealth system of claim 1, wherein the first transparent semiconductor layer has a thickness of 50-500 nm, the noble metal layer has a thickness of 1-10 nm, and the second transparent semiconductor layer has a thickness of 10-100 nm.
  5. 5. The electro-drive-based broad spectrum stealth system of claim 1, wherein the electrochromic layer is made of at least one material selected from the group consisting of WO 3-x 、V 2 O 5 、MoO 3 , cloth Lu Shilan and TiO 2 , and the electrochromic layer has a thickness of 100-500 nm.
  6. 6. The electrically driven wide spectrum stealth system of claim 1, wherein the transparent electrode is at least one selected from transparent conductive oxide and metal nanowire, and the surface sheet resistance of the transparent electrode is 10-40 Ω/cm 2 , and the transmittance is not less than 75%.
  7. 7. The electrically driven broad spectrum camouflage system of claim 1, wherein the cationic salt is selected from at least one of aluminum perchlorate, potassium perchlorate, and sodium perchlorate; The thickness of the gel electrolyte layer is 10-80 mu m.
  8. 8. The electrically driven broad spectrum stealth system of claim 1, wherein the method of preparing the gel electrolyte layer comprises: (1) Dissolving cation salt in an organic solvent to obtain cation salt solution; (2) Adding dianhydride monomer and diamine monomer into cation salt solution, mixing to obtain amino-terminated polyamide acid solution; (3) Adding a cross-linking agent, a dehydrating agent and a catalyst into the amino-terminated polyamic acid solution, and mixing to obtain a mixed solution; (4) And coating the mixed solution on a substrate, and standing for 10 min-2 h at the temperature of 30-80 ℃ to obtain the gel electrolyte layer.
  9. 9. The electrically driven broad spectrum stealth system of claim 8, wherein the organic solvent is at least one of propylene carbonate diethyl carbonate DEC, dimethyl carbonate DMC, ethylmethyl carbonate EMC, ethylene glycol dimethyl ether DME; The concentration of the cationic salt solution is 0.5-2 moL/L; the mass ratio of the total mass of the dianhydride monomer to the diamine monomer to the cationic salt solution is 1 (5-20); the molar ratio between the dianhydride monomer and the diamine monomer is n (n+1), wherein n is more than or equal to 50; The dianhydride monomer is at least one selected from pyromellitic dianhydride, benzophenone tetracarboxylic dianhydride and diphenyl ether tetracarboxylic dianhydride, and the diamine monomer is at least one selected from hexamethylene diamine, decyl diamine, diaminodiphenyl methane, diaminodiphenyl ether, p-phenylenediamine, m-toluylene diamine and diaminodiphenyl sulfone.
  10. 10. The electrically driven broad spectrum stealth system of claim 8, wherein the cross-linking agent is selected from at least one of triglycidyl para-aminophenol, triglycidyl isocyanurate, tetraglycidyl diamino diphenyl methane, tetraglycidyl diphenyl diamine, trimesoyl chloride added in an amount of 1% -5% of the total mass of the amino-terminated polyamic acid solution; the dehydrating agent is at least one of acetic anhydride, propionic anhydride, valeric anhydride and dimethyl ketene, and the adding amount is 0.5% -5% of the total mass of the amino-terminated polyamide acid solution; the catalyst is at least one selected from pyridine, 4-methylpyridine, 3, 4-dimethylpyridine, isoquinoline and triethylamine, and the addition amount of the catalyst is 0.1% -1% of the total mass of the amino-terminated polyamic acid solution.
  11. 11. The electrically-driven wide-spectrum stealth system according to claim 1, wherein a driving voltage is applied to the electrically-driven wide-spectrum stealth system, the electrically-driven wide-spectrum stealth system realizes at least three color changes, and average emissivity is between 0.1 and 0.8 in a near infrared range of 780nm to 2500 nm, and the driving voltage is +2v to-4V.

Description

Wide spectrum stealth system based on electric drive Technical Field The invention relates to an electrically-driven wide-spectrum stealth system, and belongs to the technical field of chemical material synthesis and functional materials. Background The material with variable emissivity is a material with controllable emissivity through the action of an external field (such as an electric field, a temperature field and the like), so that the material has certain capability of adapting to environmental background change, and infrared dynamic stealth of a target is realized. At present, many materials with variable emissivity are studied, namely thermochromic materials mainly comprising perovskite doped manganates and vanadium dioxide, and electrochromic materials mainly comprising tungsten trioxide (WO 3), polyaniline (PANI), polythiophene, derivatives thereof and the like. The electrorheological emissivity material is applied in the manner of an electrorheological emissivity device, and fig. 1 is a schematic structural diagram of the electrorheological emissivity device, and when an electric signal is applied to the low-emissivity electrode layer, the electrorheological emissivity material layer generates corresponding emissivity adjustment. Compared with thermochromic materials, the applied electric signals are simple and continuously controllable, so that the continuous adjustment of the emissivity of the variable-emissivity material can be realized, and in addition, the emissivity adjustment range of the electrochromic material can reach 0.1-0.8, which is far higher than that of the thermochromic materials. Thus, the electrorheological emissivity device has become a research hotspot of the current infrared dynamic stealth technology, and the infrared dynamic stealth technology is expected to be adopted on the next generation stealth aircraft. In addition, the electrorheological emissivity device has very wide application prospect in thermal control of the spacecraft. As known from kirchhoff's law and the law of absorption, reflection and transmission, the emissivity of a general material is equal to the corresponding absorptivity, and the sum of absorptivity, reflectivity and transmittance is one, and the material has a high emissivity and simultaneously shows a lower reflectivity and transmittance, and vice versa. For the variable emissivity material applied to the infrared stealth technology, when the emissivity is reduced, the infrared radiation of the target can be obviously reduced by the high reflectivity, and the infrared radiation characteristic of the target is greatly adjusted by combining with a high emissivity state. Furthermore, the electrically driven color change helps the equipment to achieve visual cloaking. Obviously, the more the color is changed, the richer the use environment and the wider the application field of the equipment can be. However, current electrically driven systems often only achieve switching between two colors. And it is difficult to achieve a synergistic change in near infrared emissivity and color. Disclosure of Invention Aiming at the problems of application limitation, narrow adjustment range and low response speed of the existing stealth system, the invention provides an electric-drive-based wide-spectrum stealth system, which comprises a substrate, a multi-layer composite electrode, an electrochromic layer, a gel electrolyte layer and a transparent electrode which are sequentially stacked, wherein the multi-layer composite electrode consists of a first transparent semiconductor layer/a noble metal layer/a second transparent semiconductor layer. Compared with other devices for regulating and controlling the color or the near infrared emissivity, the electrically-driven wide-spectrum stealth system designed by the patent can simultaneously regulate the color and the near infrared region, has the advantages of high response speed, simple preparation process, convenience in assembly and wide application prospect. Specifically, based on mutual interference between the first transparent semiconductor/noble metal/second transparent semiconductor, controllable reversible switching of a plurality of colors can be achieved. The three-layer composite electrode not only has better conductivity and improves the response speed of the device, but also can lead the reflected light of the device to have narrower frequency band through the Fabry-Perot interference, thereby presenting color. When the device is driven by external field voltage to change color, the refractive index n and the extinction coefficient k of the electrochromic layer material change, so that the device cooperates with the composite electrode, and can reflect different lights according to different values of n and k to present different colors. Preferably, the substrate is a silicon wafer substrate, a transparent glass substrate or a metal substrate. Preferably, the first transparent semiconductor layer an