Method for synthesizing sensitive photochromic WO3 nano powder by formaldehyde inducement

Abstract

The invention relates to a synthesis method of sensitive photochromatic WO3 nanometer powder, a formaldehyde-inducing synthesis method of sensitive photochromatic WO3 nanometer powder, comprising the following steps of: 1) selecting 0.05 mol / L to 3 mol / L tungstate solution, dripping hydrochloric acid while agitating tungstate solution by magnetic agitator at 400 r / min to 600 r / min, regulating pH as 0.2 to 2.5; then dripping 35% to 40% formaldehyde solution gradually while agitating formaldehyde solution magnetically, agitating the mixture evenly for 2h to 6h, to obtain mixture A; wherein, volume ratio of tungstate solution to formaldehyde solution is: tungstate solution : formaldehyde solution=1:0.04 to 1:0.20; 2) putting the obtained mixture A into water heat reaction kettle for water heat reaction at 80 deg C to 180 deg C for 2 to 6 days, to obtain mixture B; 3) washing and collecting powder, to obtain formaldehyde-inducing synthesized sensitive photochromatic WO3 nanometer powder. The synthesis method is simple, and the synthesized sensitive photochromatic WO3 nanometer powder is provided with high photochromatic sensitivity.

Description

technical field [0001] The present invention relates to sensitive photochromic WO 3 Synthesis method of nanopowder. Background technique [0002] Photochromic material is a traditional functional material. Scientists at the end of the 19th century first discovered photochromism, but it did not attract widespread attention. In 1949, Hirshberg first proposed a scientific definition of photochromism and replaced it with Photochromism The original Phototropic. The definition points out that: a chemical substance (A) undergoes a chemical reaction to produce a product (B) under the action of light; the chemical substance (B) can return to (A) under the action of light or heat, and the absorption of the two Spectra are significantly different. With the deepening of research, this definition is gradually perfected and expanded. In the following 20 years, scientists began to gradually enter the field of research. Until 1978, Professor H.G.Heller, a famous British chemist and one ...

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Problems solved by technology

But at present, the main research on it is concentrated on the sol and thin film, but the research on the powder is less, in order to expand WO 3 application range of photochromic materials, it is necessary for WO 3 Photochromic powders are studied, but in less relevant WO 3 In the research report on the synthesis of powder and photochromism, the preparation method is relatively complicated, and the prepared WO 3 Powders are often densely packed amorphous micron structures with weak photochromic ability. The optimal excitation light source reported in the report is a 350W high-pressure mercury lamp

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