Preparation method and application of nano tungsten oxide water solution

Abstract

The invention discloses a preparation method and application of a nano tungsten oxide water solution. The preparation method comprises the following steps: respectively weighing ammonium metatungstate and sodium borohydride in mass ratio of (1-10):1; adding the into deionized water to obtain an ammonium metatungstate water solution with concentration of 5-50%; adding sodium borohydride solid into the ammonium metatungstate water solution, uniformly mixing, standing at room temperature of 95 DEG C to react for 10-60 min to obtain a blue uniform tungsten oxide nano water solution with particle size of 0.1-100 nm. The preparation method provided by the invention has the advantages of being simple, free of a dispersing agent, free of pH regulation, short in preparation time, basically free of impurities and suitable for large-scale production. The prepared tungsten oxide nano water solution is relatively good in stability and small in particle size of nano tungsten oxide and can be widely applied to the fields of smart windows, large-area two-dimensional displays, gas-sensitive elements, dye-sensitized solar cells, automatic rearview mirrors and power accumulators.

Description

technical field [0001] The invention relates to a preparation method of a nano-tungsten oxide aqueous solution, which belongs to the field of nano-materials. Background technique [0002] Metal oxide nanomaterials are an important branch of nanomaterials. Tungsten oxide is a typical transition metal oxide. Nano-tungsten oxide is a new type of functional material. Due to its excellent color-changing properties, it is widely used in smart windows, large-area flat-panel displays, gas sensors, dye-sensitized solar cells, and automotive rear It has broad application prospects in many potential new fields such as mirrors and energy storage devices, and has become a research hotspot. At the same time, the energy band gap of tungsten oxide is 2.5eV, which can be used as a photocatalyst responding to visible light, and has low toxicity and low cost. [0003] The traditional nano-tungsten oxide aqueous solution preparation method: 40ml deionized water as solvent, 5ml acetic acid as ...

AI Technical Summary

Problems solved by technology

[0004] In the process of preparing nano-tungsten oxide aqueous solution, there are still the following problems: (1) A suitable dispersant must be selected to disperse nano-tungsten oxide to prevent the agglomeration of nano-tungsten oxide

(2) The concentration of nano-tungsten oxide in the nano-tungsten oxide aqueous solution is relatively limited, and there are many impurities

(3) The preparation process is more complicated, the process is more cumbersome, and the preparation time is longer

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