Tungsten Oxide

Basic Information:

Chemical formula: WO₂, composed of tungsten (W) and oxygen (O), where tungsten has a valence of + 4 and oxygen – 2.
Crystal structure: WO₂ has a monoclinic crystal structure. In its crystal structure, tungsten and oxygen atoms are interconnected in a specific arrangement, forming a complex three-dimensional network.
Appearance: WO₂ powder generally appears dark grey or black.
Density: WO₂ has a relatively high density of about 12.11 g/cm³.
Hardness: WO₂ has a certain degree of hardness, but compared with some high hardness materials (such as tungsten carbide) hardness is lower.

Application Fields

Transistors and integrated circuits: Tungsten Oxide is semiconductor properties make it potentially useful in the field of transistors and integrated circuits.

Resistive materials: Since the resistance of WO₂ varies significantly with temperature, it can be used as a temperature-sensitive resistor (thermistor) material.

Optical modulation materials: Tungsten Oxide is photochromic and electrochromic properties allow it to be used as an optical modulation material. In the field of optical communications, it can be used to manufacture optical switches, optical attenuators and other optoelectronic devices, which can be used to regulate the on-off of the optical path or the magnitude of the light intensity by changing the optical or electrical signals.

Photo-thermal conversion materials: WO₂ has certain application potential in photo-thermal conversion. Using its high absorption properties in the visible and near-infrared bands, it can efficiently convert light energy such as solar energy into heat energy.

Electrode materials for lithium-ion batteries: In the research of lithium-ion batteries, WO₂ has received attention as an electrode material. the crystal structure of WO₂ provides a channel for the embedding and de-embedding of lithium ions, and its high theoretical specific capacity provides the possibility of increasing the energy density of the battery.