The Water Structural Mode of Tungsten Trioxide Gasochromic (3)

After studies found the water structural molecules can well explain the gasochromic coloring process, the same it can also explain the bleaching process of gasochromic. gasochromic coloring and bleaching process is an exothermic combustion process, WO3 and Pt particles as catalysts. The bleaching process is as follows: When the colored nano wires under the conditions of air or oxygen, the O2 molecules adsorbed on the surface will cause ionization and transfer on the Pt nano particles surface. The O atoms which transfer to the tungsten trioxide will react with H to form hydroxyl which is on the surface of tungsten oxide. Then with the O atoms continuous transfer, O atoms in the nano wire surface by capturing free electrons form O2-. With the decrease of nano wire carrier concentration the donor level which is near local area oxygen vacancies become unstable. When the donor levels electron caught by oxygen atoms and localized on the surface of the nano wires the W ions valence state which is linked with oxygen vacancies atomic valence will fromW5 + back into the W6 +, causing localized structural water molecules instability. Finally, the structural water molecules dissolve into H + and O particles. On the one hand, H + diffusion to the nano wires surface then react with O which is adsorbed on the surface to form H2O molecules adsorbed into the air. On the other hand, O ions fill the oxygen vacancies, and the material structure return to the pre-colored WO3 structure, complete bleeding process of tungsten trioxide nanowire films.

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