Tungsten Oxide Powder: Key Facts & Uses

(tungsten oxide powder)

Composition: Primarily tungsten trioxide (WO₃), sometimes tungsten dioxide (WO₂). CAS 1314-35-8.

Appearance: Fine, dry powder. Color varies: yellow (common WO₃), blue (WO₂.90), violet (WO₂.72), or brown depending on stoichiometry and oxidation state.

Properties:
* High Chemical Stability: Resistant to most acids except HF; dissolves in strong alkalis.
* High Melting Point: Approximately 1473°C (WO₃).
* Low Solubility: Insoluble in water and most organic solvents.
* Semiconducting: Bandgap around 2.6-2.8 eV for WO₃.
* Electrochromic: Changes color reversibly with applied voltage (used in smart windows).
* Photocatalytic: Active under visible/UV light for reactions like pollutant degradation or water splitting.
* Gas Sensing: Sensitivity to gases like NO₂, NH₃, H₂S due to conductivity changes.

Key Applications:
1. Smart Windows & Displays: Electrochromic layers for controllable tinting.
2. Catalysis: Catalyst or support in petroleum refining, chemical synthesis, and environmental catalysis (e.g., SCR denox).
3. Gas Sensors: Detecting toxic or flammable gases in industrial safety systems.
4. Pigments: Yellow ceramic pigments and coatings.
5. Photocatalysis: Water treatment (degrading organic pollutants), hydrogen production.
6. Intermediate: Precursor for producing tungsten metal powder and tungsten carbide powders.
7. Nanomaterials: Nanorods, nanowires, and nanoparticles for enhanced functional properties.

Forms: Available as micron-sized powders and increasingly as nanoparticles (enhanced surface area/reactivity).

Handling: Fine powder. Avoid inhalation. Use appropriate PPE (dust mask, gloves). Store in a cool, dry place.

(tungsten oxide powder)

Important: Tungsten oxide powder itself is generally considered low toxicity but always consult specific Material Safety Data Sheets (MSDS/SDS) for safe handling procedures.
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