Synthesis of Defective Tungsten Oxide Nanomaterials

Defective tungsten oxide nanomaterials have drawn wide attention in the tungsten products industry because of their unique structural properties and excellent properties. The use of traditional solvothermal method can be prepared with defective tungsten oxide nanomaterials. Defective tungsten oxide nanomaterials synthesis method is as follows:

First, 913 mg of ammonium tungstate and 183 mg of citric acid were dissolved in 15 mL of distilled water, which was stirred for 15 minutes and then transferred to a 20 mL Teflon autoclave. After heating to 180 ° C for 12 hours. The reactor was then allowed to cool to room temperature. After removing the reaction solution, washing with distilled water is repeated until the solution is neutral, and then washed three times with ethanol and centrifuged to obtain the product. Finally, the blue solid product was dried in a vacuum oven at 60 ° C for 12 hours to finally give a blue defect sample of tungsten oxide nanomaterials.

The resulting defect tungsten oxide nanomaterials by scanning electron microscopy of the material surface morphology and size, etc. were characterized. It can be observed that the morphology of tungsten oxide is a network of nanowires intertwined with each other, having a length of about 0.05-1.5μm and a diameter of about 15-20 nm.

Defective tungsten oxide was characterized by transmission electron microscopy. The results show that the morphology of the defect tungsten oxide is different from that of the electron micrograph. To better study the growth characteristics and orientation of defect tungsten oxide, tungsten oxide nanomaterials were further studied by high resolution transmission electron microscopy. The lattice spacing of the defective tungsten oxide nanowires is 0.367 nm and the data are consistent with the data of the tungsten oxide (110) crystal plane. At the same time, it is noted that the tungsten oxide nanowires form an included angle of 90 ° on the (110) crystal plane with corresponding lattice spacings of 0.367 nm and 0.320 nm, respectively, demonstrating that the hexagonal phase tungsten oxide is grown along the (110) direction.

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