Tungsten trioxide nanopowder may be applied for producing heat insulating window glass. And there are many methods for preparing nano grain size tungsten trioxide. The following describes a preparation method of tungsten trioxide nanosheet.
Preparation of Tungsten Trioxide Nanosheet
A novel intercalation compound was synthesized in a nonpolar heptane medium using H2W2O7 and n-octylamine as material, and a dingal material was finally obtained after removing the organic amine and calcining. The material exhibits extremely high sensitivity to alcohol. In addition, the H2W2O7•xH2O reacts with heptane/octane mixed solution, as shown in the following formula:
H2W2O7•xH2O+aRNH2→H2-a(RNH3)W2O7+xH2O
The released interlayer water undergoes a hydrolysis reaction with octylamine to form high alkaline micro-zone aqueous solution, and the [W2O7] bilayer is dissolved in high alkaline solution into [WO4] monolayer, as shown by the following formula:
SEMH2-a(RNH3)aW2O7+(2b-a)RNH2+H2O→2H2-b(RNH3)bWO4
The obtained H2-b(RNH3)bWO4 self-assembles into highly ordered inorganic-organic hybrid nanobelt (C8NH2-HWO) in quasi-inverse micelle medium. After the nanobelt is dispersed in nitric acid aqueous solution, tungsten trioxide nanosheet can be obtained by magnetically stirring, solid-liquid separation, washing, and heat treatment.
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