Single-Dimensional Network Structure Tungsten Trioxide Preparation

At present, people have been able to prepare different pore sizes of porous tungsten trioxide and using a variety of methods by materials that containing a large hole, mesoporous and microporous, or only two of the pore size. These materials have important applications in catalysis, selective separation and sensors; however, the porous material with a foam shape is generally more fragile and friable. Tungsten trioxide is a transition metal oxide that is widely studied because of its unique properties. In addition, the doping tungsten trioxide complex also has a catalytic effect. It means that tungsten trioxide morphology and structure of the desired application function has a direct relationship.

Steps:
Preparing dimensional network structure WO₃ containing mesopores by concentrating hydrogen peroxide (H₂O₂), methanol, over-acid and polyvinylpyrrolidone (PVP) solution. Preparing WO₃ mesh structure by using optical microscopy, scanning electron microscopy (SEM), powder X- ray diffraction (XRD), thermal gravimetric analysis (TG), high-resolution transmission electron microscope (HRTEM) and N₂ adsorption isotherms (BET) technology after firing.

Conclusions:
1. Optical microscopy and SEM photograph show this shape of the foam cube mesh structure regardless of WO₃, which are relatively stable calcinations that are supported by the nature of the performance.
2. Magnified SEM image shows that the wall mesh structure is assembled from nanoparticles made of WO₃ after calcination.
3. XRD diffraction analysis shows that WO₃ is amorphous foam before calcination, and is orthorhombic crystals after calcination. As PVP structure, it has the advantage of inducing inexpensive agents and stable solution.

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