What Are the Characteristics of Nano Violet Tungsten Oxide?

Nano violet tungsten oxide (usually referring to nano-sized violet tungsten oxide with the chemical formula of WO₂.₇₂ or W₁₈O₄₉) is an important tungsten oxide with a wide range of applications. Here are the main characteristics of nano violet tungsten oxide:

I. Appearance: It appears as a deep purple or blue-purple fine powder, which is due to its special crystal structure and light absorption characteristics caused by oxygen deficiencies.

II. Oxygen-defective Structure: The chemical composition of violet tungsten oxide (WO₂.₇₂) indicates the presence of oxygen vacancies. This non-stoichiometric structure gives it special electrical and chemical properties.

III. Specific Surface Area: Due to its small particle size, porous or irregular structure, and the superposition of nano-effects, it possesses a large specific surface area, enhancing its catalytic and adsorption capabilities.

IV. Thermal Stability: Although not as stable as tungsten trioxide (WO₃) in its fully oxidized state, nano violet tungsten oxide still exhibits high thermal stability, making it suitable for use in high-temperature environments, such as high-temperature catalysis or heat treatment processes.

V. Solubility: Nano violet tungsten oxide is highly stable in aqueous solutions and common organic solvents. It is insoluble in water, alcohols, and most acids but soluble in ammonia water and alkaline solutions.

VI. Chemical Reactivity and Reducibility: Compared to yellow and blue tungsten oxides, violet tungsten oxide is easier to form in reducing atmospheres and exhibits higher reactivity during the preparation of tungsten metal powder, often serving as a raw material for producing ultrafine tungsten powder.

VII. Oxidability: Although nano violet tungsten oxide is primarily used as a reducing agent, it can also undergo oxidation reactions with certain substances under specific conditions.

VIII. Optical Properties: It has a strong ability to absorb visible light, especially in the visible and near-infrared regions, making it suitable for photocatalysis and photoelectric devices.

IX. Photocatalytic Performance: Due to its bandgap characteristics, nano violet tungsten oxide exhibits photocatalytic activity under UV and visible light, which can be used to degrade organic pollutants.

X. Electrochromic Properties: It has good electrical conductivity and can change color under the action of an electric field, making it suitable for applications in smart windows, displays, and other fields.

XI. Application Fields

Catalyst: Due to its excellent chemical catalytic performance, violet tungsten oxide is often used as a catalyst or carrier to enhance chemical reaction efficiency. Its photocatalytic properties are particularly prominent, promoting chemical reactions under illumination and often applied in water pollution reduction or air pollution treatment projects, such as degrading organic pollutants and purifying air.

Battery Energy Storage Materials: Suitable for making lithium battery anodes, it exhibits strong corrosion resistance, extends driving range, and improves charging and discharging performance. It can also be used in energy storage devices such as supercapacitors to increase energy density and power density.

Photoelectric Materials: With excellent photoelectric properties, violet tungsten oxide can be used to prepare photoelectric detectors, solar cells, and other photoelectric conversion devices.

Gas Sensors: Highly sensitive to various reducing gases, it is suitable for detecting ozone, nitrogen dioxide, nitric oxide, ammonia, hydrogen sulfide, etc. It has broad application prospects in environmental monitoring, industrial safety, household health, and other fields.

Electrochromic Materials: Used for light-adjusting glass and smart glass in buildings, automobiles, aviation, and other fields.

Shielding Materials: With strong electromagnetic wave absorption properties, it can be made into radiation-proof clothing or applied to solar thermal shielding devices, finding applications in medical, electronic, and defense fields.

Near-infrared Photothermal Diagnostic and Therapeutic Drugs: Due to its strong absorption in the near-infrared region, violet tungsten oxide is also used in the preparation of cancer treatment drugs in the medical field.

Paints and Inks: Adding violet tungsten oxide to paints or inks can give them special electrical, optical, or thermal properties, enabling the preparation of functional coatings or printing materials.

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