Tungsten Trioxide Nanometer Array Applied for Electrochromic Film

Tungsten trioxide nanometer array can be used to produce electrochromic film. And the prepared films are mainly applied to architectural smart windows with broad application prospects. The tungsten trioxide nano array electrochromic film can be prepared by the following steps:

More details, please visit:
http://www.tungsten-powder.com/tungsten-oxide.html

1.0 FTO conductive glass was ultrasonically cleaned with acetone, deionized water and ethanol for 10min, and purged with nitrogen to obtain clean FTO conductive glass;

2.0 An excess of 5mol/L concentrated hydrochloric acid was dropped into a 2mol/L sodium tungstate aqueous solution until no new precipitate was formed. The precipitate was washed with deionized water, and white tungstic acid was obtained, which was dissolved in the hydrogen peroxide aqueous solution with a mass percentage of hydrogen peroxide of 20%. And the molar ratio of white tungstic acid to hydrogen peroxide in the aqueous hydrogen peroxide solution was 1:2. The deionized water was added to prepare a tungsten peroxide acid solution of the tungsten concentration of 5mol/L, and then refrigerated at 4°C;

3.0 The peroxy tungstic acid solution in step 2.0 was spin-coated on the conductive surface of the clean FTO conductive glass at a speed of 2000r/min for 40s, and then placed in a box furnace at 400°C for 5min. Repeated spin coating three times to obtain FTO conductive glass covered with a seed layer;

4.0 Add hexacarbonyl tungsten to a solution of 70ml of absolute ethanol and stirring to obtain a precursor solution with a concentration of 0.05mol/L of hexacarbonyl tungsten;

5.0 Based on the FTO conductive glass covered with the seed layer in step 3.0, the substrate was vertically erected and fixed in the reaction chamber polytetrafluoroethylene liner, and then the precursor solution prepared in step 4.0 was poured into the reaction vessel. The reaction kettle was reacted at a constant temperature in a 250°C oven for 8h. After the reaction was completed, it was taken out from the reaction vessel, cooled with tap water, then rinsed with deionized water, vacuum dried, and then heat treated at 350°C for 3h in a box furnace to obtain a tungsten trioxide nano array electrochromic film.

• < Prev
• Next >