Nano tungsten oxide particles (WOx, where x depends on the stoichiometry of oxygen, commonly WO3, WO2.9, WO2.72, etc.) are a type of nanomaterial with special physical and chemical properties. Their physical properties mainly include the following aspects:
- Particle Size of Nano Tungsten Oxide Particles The particle size of nano tungsten oxide is typically between 1 and 100 nanometers. This size range gives rise to significant nano-effects, such as quantum size effects, small size effects, and surface/interface effects.
- Structure of Nano Tungsten Oxide Particles Nano tungsten oxide generally exists in a crystalline structure. However, due to varying oxygen atom counts, different stoichiometries and colors may form, such as yellow tungsten (WO3), blue tungsten (WO2.9), and purple tungsten (WO2.72). Additionally, there is cesium-doped tungsten oxide (Cs0.33WO3), which is mainly used as an infrared absorber.
- Optical Properties of Nano Tungsten Oxide Particles Nano tungsten oxide exhibits excellent optical properties, showing tunable absorption and emission spectra. It has a significant absorption enhancement effect in the near-infrared light range (e.g., 1400–1600 nm and 1900–2200 nm) while maintaining high transparency to visible light. This makes nano tungsten oxide widely applicable in fields such as photocatalysis, optoelectronic devices, and thermal shielding glass.
- Electrical Properties of Nano Tungsten Oxide Particles Nano tungsten oxide possesses good electrical properties and can be used as electrode material, capacitor material, and catalyst for batteries. Its high surface area provides more active sites, enhancing electrocatalytic performance, which helps improve the efficiency and performance of devices like fuel cells.
- Thermal Properties of Nano Tungsten Oxide Particles Nano tungsten oxide has excellent thermal properties, including high thermal conductivity and resistance to thermal shock. This makes it suitable for use in thermal conductive materials and high-temperature processes, such as creating high-temperature coatings that provide heat resistance, high thermal conductivity, and corrosion resistance.
- Chemical Properties of Nano Tungsten Oxide Particles The surface of nano tungsten oxide is highly active and exhibits excellent chemical catalytic properties. It can be used in various catalytic processes such as gas removal, organic synthesis, electrocatalysis, and photocatalysis.
- Color and Morphology of Nano Tungsten Oxide Particles Depending on the stoichiometry of oxygen, nano tungsten oxide particles can exhibit different colors, such as light yellow (WO3), blue (WO2.9, cesium-doped WO3), and purple (WO2.72). They are usually found in a powder form but can also be prepared in other forms, such as thin films or sols, through different preparation methods.
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