The Water Structural Mode of Tungsten Trioxide Gasochromic (1)

In the study the mechanism of gasochromic, using XRD diffraction and Raman spectroscopy to study the crystal structure changes and W-O bond vibrate mode changes which are tungsten trioxide nano wire film before and after coloring. The study showed, hydrogen ions and electrons in the double injection mode will cause a new tetragonal phase which is WO3-x • H2O. And it also leads to a significant change in the vibration pattern W-O bond. Through these study results put forward a gasochromic mechanistic models which is the structural water molecules and oxygen vacancies coexist in the nano wire body.

In WO6 hexahedral of WO3, the injection H + adsorbed in the vicinity of O2-, injection e- filled the bottom of the conduction band localized states WO3, resulting W6 + became W5 +. In hexahedral structure 6 oxygen are likely to absorb the H +, once one O adsorption of H +, the role of the W-O bond will become weak and O more active. It will easily re-adsorption 1 H + to form a structure of water molecules (H2O). When W-O bond weakening the structure is reconstruction, which the W remove to O direction, resulting in W-O bond lengths elongate and shorten the length of the other side of the WO bond. Then W-O bone effects can enhance, not easy to re-adsorbed H +. In the heat or light condition, the water structural molecules easy to fall off O, resulting in an oxygen vacancy. In this mode, involving the WO bond length flexible change better explain the coloring process of Raman spectrum.

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