Tungsten Trioxide Powder: Essential Properties and Uses
(tungsten trioxide powder)
Chemical Formula: WO3
Appearance: Fine yellow powder, odorless.
CAS Number: 1314-35-8
Key Properties: Insoluble in water. Good electrical conductivity under certain conditions. High chemical stability. Exhibits electrochromism (changes color with applied voltage). Photocatalytic activity. Semiconductor behavior. High melting point (~1473°C). Non-flammable.
Primary Production: Typically derived from ammonium paratungstate (APT) via thermal decomposition or acid precipitation followed by calcination.
Major Applications:
Electrochromic Devices: Crucial component in smart windows, mirrors, and displays. Enables controllable light and heat transmission by reversibly changing color (blue to transparent) with applied voltage.
Gas Sensors: Used in detecting toxic gases (e.g., NOx, H2S, NH3) due to conductivity changes upon gas adsorption. Offers good sensitivity and selectivity.
Photocatalysis: Acts as a photocatalyst under visible light for environmental remediation (degrading organic pollutants) and water splitting (hydrogen production).
Pigments: Provides a durable yellow pigment for ceramics, paints, and plastics.
Chemical Catalysis: Serves as a catalyst or catalyst support in various industrial chemical processes, including petroleum refining and oxidation reactions.
Other Uses: X-ray screens, fireproofing fabrics, ceramic glazes, corrosion inhibitors.
Handling & Safety: Low acute toxicity. Handle with standard industrial hygiene practices. Avoid inhalation of dust (use respirators in dusty conditions). Avoid contact with strong reducing agents. Store in a cool, dry place in tightly sealed containers. Refer to the Safety Data Sheet (SDS) for detailed handling and emergency procedures.
(tungsten trioxide powder)
Key Advantages: Versatile functional material. Stable. Relatively low cost for its applications. Tunable properties via doping or nanostructuring.
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