Orange tungsten oxide is a compound that usually refers to a non-stoichiometric oxidation state of tungsten oxide with the chemical formula WO3.

Orange tungsten oxide is a compound usually referred to as a non-stoichiometric oxidation state of tungsten oxide with the chemical formula WO3. However, it is orange in color. This orange color originates from defects or impurities in the crystal structure of tungsten oxide, or from the presence of low valence tungsten ions due to partial reduction. Tungsten oxide is usually yellow or green, but under certain conditions (e.g. heat treatment or partial reduction) it can take on an orange, blue or other color.

Orange Tungsten Oxide Specification Sheet

Due to its high specific surface area, this orange-colored tungsten oxide exhibits excellent performance in applications such as catalysts, gas sensors, and optoelectronic materials. The large surface area helps to increase the reaction rate and improve the efficiency of the material.

The applications of orange tungsten oxide are mainly focused on photovoltaics and catalysis, especially in gas sensors, smart windows, and photocatalytic degradation of organic pollutants.

For tungsten oxide, the color change may originate from the following factors:
1. Particle size: When the particle size is reduced to the nanometer level, the optical properties of the material change, which may lead to a slight change in color. This is because quantum size effects and light scattering effects are more pronounced in nanoscale materials.
2. Surface state: A high specific surface area usually means more surface atoms, which may interact with oxygen, moisture, or other gases in the environment, leading to a change in the surface state that can affect the color of the material.
3. Defects and impurities: During the preparation of high specific surface area tungsten oxide, additional crystal defects or impurities may be introduced, and these factors may also contribute to color changes. For example, partially reduced tungsten oxide may appear orange or blue.

Orange Tungsten Oxide SEM