W1 O3

Tungsten trioxide (WO₃) is a semiconductor compound belonging to the transition metal oxide family, characterized by a monoclinic crystal structure and moderate mechanical stiffness. It is primarily used in electrochromic devices, gas sensing applications, and photocatalytic processes, where its bandgap and ion-intercalation properties enable switchable optical and catalytic functionality. Engineers select WO₃ for applications requiring color-changing windows, smart glass, and environmental monitoring sensors due to its reversible electrochemical behavior and stability; it is also investigated for photocatalytic water splitting and air purification in research contexts.