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CN-121974402-A - Tungsten oxide nano material with ultra-fast photochromic response and preparation method thereof

CN121974402ACN 121974402 ACN121974402 ACN 121974402ACN-121974402-A

Abstract

The invention relates to a tungsten oxide nano material with ultra-fast photochromic response characteristic and a preparation method thereof, belonging to the technical field of photochromic materials. Aiming at the technical bottlenecks of complex preparation process, high production cost, severe reaction conditions, excessively high material filling ratio and the like commonly existing in the existing photochromic materials, the invention creatively provides a simple hydrothermal synthesis strategy with controllable size. According to the method, a tungsten source, a surfactant, an acid source and a dispersing agent are mixed according to a specific proportion, and a one-step hydrothermal method is adopted to prepare the nanoscale tungsten oxide material with the characteristic of ultra-fast photochromic response. The obtained product can realize the rapid response and stable photochromic performance of 0.1 s by virtue of unique microscopic morphology and only 1% of solid content in a dispersion system. The novel nanomaterial provides an innovative solution for solving the technical problem that the preparation cost and the color change performance of the traditional photochromic material are difficult to consider, and has important popularization value and wide application prospect in the application fields of the photochromic materials such as intelligent windows, optical storage, optical filters and the like.

Inventors

  • HU PENGFEI
  • Ge Linheng
  • An Xiaonan

Assignees

  • 北京航空航天大学

Dates

Publication Date
20260505
Application Date
20260302

Claims (6)

  1. 1. The tungsten oxide nano material with the ultrafast photochromic response and the preparation method thereof are characterized in that the method comprises the following steps: Step 1, adding a tungsten source and a surfactant into a dispersing agent, and carrying out ultrasonic dispersion treatment to obtain a uniformly dispersed tungsten source solution; Step 2, stirring the tungsten source solution for 2-5 hours at 50-70 ℃, then slowly dropwise adding an acid source into the tungsten source solution, and regulating and controlling the pH value of the system to be within a range of 2-7; Step 3, continuously stirring the solution with the pH value adjusted at 50 ℃ for 1-2 hours, then transferring the solution into a reaction kettle with a polytetrafluoroethylene liner, and heating and reacting for 5-10 hours at a constant temperature of 120 ℃; And 4, after the reaction is finished, collecting a product, sequentially washing the product with deionized water and absolute ethyl alcohol for 3-5 times, and drying the product at 60-80 ℃ to obtain the tungsten oxide nano material with the ultrafast photochromic response.
  2. 2. The ultra-fast photochromic-response tungsten oxide nanomaterial and the preparation method thereof according to claim 1, wherein the tungsten source is one of ammonium paratungstate, ammonium metatungstate, sodium tungstate, tungstic acid and tungsten acetylacetonate.
  3. 3. The ultra-fast photochromic-responsive tungsten oxide nanomaterial and the preparation method thereof according to claim 1, wherein the surfactant is one of sodium dodecyl sulfate, cetyltrimethylammonium bromide, polyethylene glycol (with a molecular weight of 30000-100000) and polyvinylpyrrolidone (with a molecular weight of 10000-100000).
  4. 4. The ultra-fast photochromic-response tungsten oxide nanomaterial and the preparation method thereof are characterized in that the dispersing agent is one of water, propylene glycol methyl ether and ethanol-water mixed solution (volume ratio is 1:1-1:5).
  5. 5. The ultra-fast photochromic-responsive tungsten oxide nanomaterial and the preparation method thereof according to claim 1, wherein the acid source is one of hydrochloric acid, nitric acid, sulfuric acid, oxalic acid and acetic acid.
  6. 6. The ultra-fast photochromic-response tungsten oxide nanomaterial and the preparation method thereof according to claim 1 are characterized in that deionized water is used as a washing solution, centrifugal washing is carried out for 3-5 times at a rotational speed of 8000-10000 r/min, the centrifugal time is 5-8 min each time, soluble salt impurities in a system are removed, absolute ethyl alcohol is used as the washing solution, centrifugal washing is carried out for 3-5 times at the same rotational speed, and centrifugal washing is carried out for 5min times each time, so that residual surfactant and organic impurities are removed.

Description

Tungsten oxide nano material with ultra-fast photochromic response and preparation method thereof The invention relates to the technical field of photochromic materials, in particular to a tungsten oxide nano material with ultra-fast photochromic response and a preparation method thereof. Background The photochromic material is an intelligent material capable of reversibly changing color under the stimulation of external light, has wide application prospect in various fields such as intelligent windows, optical storage devices, optical filters, anti-counterfeiting marks and the like due to unique light response characteristics, and becomes one of research hotspots in the field of material science. Among the many photochromic materials, tungsten oxide (WO 3) based materials are considered as one of the most potential photochromic materials for application due to the advantages of high photochromic efficiency, good chemical stability, environmental friendliness, and the like. However, in the actual preparation and application process of the existing tungsten oxide photochromic material, a plurality of technical bottlenecks still exist, and the industrialization process of the existing tungsten oxide photochromic material is severely restricted. The preparation method is complex, the traditional tungsten oxide photochromic material is prepared by adopting a sol-gel method, a sputtering method, a vapor deposition method and the like, the methods often require multiple steps of reaction procedures, are complex in operation and have high requirements on equipment, the production cost is high, expensive organic tungsten sources or special reagents are required to be used in part of the preparation process, the energy consumption of part of the process is high, the production cost is further increased, the reaction conditions are severe, the traditional methods require high-temperature calcination (usually more than 500 ℃), high vacuum or inert gas protection and other extreme reaction conditions, the process difficulty is increased, the production risk is also improved, the material filling rate is high, the existing tungsten oxide material is difficult to regulate due to the microcosmic appearance, the high solid content (usually more than 10%) in a dispersing system is required to achieve effective photochromic performance, and the high filling rate can cause poor material dispersion stability and poor film forming performance, so that the application effect of the tungsten oxide material in an actual device is affected. In order to solve the technical problems, scientific researchers have conducted a great deal of research work to try to improve the photochromic performance of the tungsten oxide material by optimizing the preparation process, regulating the morphology of the material and the like. For example, there are studies on preparing tungsten oxide nanostructures by a template method, which can improve morphology to some extent, but the preparation and removal process of the template increases process complexity, and studies on improving photochromic response speed by doping modification, but precise control of doping proportion is often required, and impurities may be introduced to affect material stability. In general, no technology for preparing the tungsten oxide photochromic material has been developed, which can simultaneously achieve the simplicity of the preparation process, low cost, mild reaction conditions and low filling rate, and high performance, so that the development of a novel tungsten oxide photochromic material and a simple preparation method thereof are technical requirements to be solved in the field. Disclosure of Invention The invention relates to a tungsten oxide nano material with ultra-fast photochromic response and a preparation method thereof, belonging to the technical field of photochromic materials. Aiming at the technical bottlenecks of complex preparation process, high production cost, severe reaction conditions, excessively high material filling rate and the like commonly existing in the existing photochromic materials, the invention creatively provides a simple hydrothermal synthesis strategy. The invention prepares a tungsten oxide nano material with ultra-fast photochromic response, which comprises the following steps: Step 1, adding a tungsten source and a surfactant into a dispersing agent, and carrying out ultrasonic dispersion treatment to obtain a uniformly dispersed tungsten source solution; Step 2, stirring the tungsten source solution for 2-5 hours at 50-70 ℃, then slowly dropwise adding an acid source into the tungsten source solution, and regulating and controlling the pH value of the system to be within a range of 2-7; Step 3, continuously stirring the solution with the pH value adjusted at 50 ℃ for 1-2 hours, then transferring the solution into a reaction kettle with a polytetrafluoroethylene liner, and heating and reacting for 5-10 hours at a constant te