Niobium Doped Tungsten Oxide Nanomaterials

Tungsten oxide is a transition metal oxide widely studied because of its unique properties. It has been widely used in electrochromic devices, sensors, separation materials and so on. In recent years, great progress has been made in the synthesis of nanoparticles, and the focus of research has shifted to the study of anisotropic nanoparticles.

Some researchers introduced transition metal niobium into WO6 octahedral structure to make the whole octahedral structure have larger specific surface area, and change the arrangement of electrons, holes and defects in nano-tungsten oxide, thus changing the ultraviolet absorption performance of nano-tungsten oxide. The preparation process of niobium doped tungsten oxide nanomaterials includes:

(1)Tungsten hexachloride solution with concentration of 0.2-0.3 mol/L was placed in polytetrafluoroethylene reactor for 4-10 phr, and 12-20 phr of secondary distilled water was added to stir it to dissolve sufficiently.

(2)Add 1-10 phr of niobium pentachloride ethanol solution with concentration of 0.05-0.1 mol/L in the above solution, continue stirring and mix well.

(3)1-5 phrases of hydrochloric acid solution with concentration of 2-4 mol/L and 28-35 phrases of ammonium sulfate solution with concentration of 0.4-0.5 mol/L were added to the polytetrafluoroethylene reactor and stirred for 0.5-1 H.

(4)The PTFE reactor is sealed and placed in a programmed oven. The heating and cooling rates are 1-2 C/min and 24-48 h at 150-200 C respectively. The reactor is taken out and cooled to room temperature. The reaction products are washed with distilled water to neutral and dried in an oven at 80-100 C for 24-48 h to obtain niobium doping tungsten oxide nanomaterials.

The size of tungsten oxide nanofibers obtained is 50 nm. The results show that the absorption of ultraviolet light by Nb-doped tungsten oxide nanomaterials can be significantly improved.

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