Tungsten dioxide (WO₂), also known as brown tungsten oxide, is an inorganic compound composed of tungsten and oxygen. It mainly has the following characteristics:

Violet Tungsten Oxide (VTO) is a unique tungsten oxide with the chemical formula W18O49 or WO2.72. The characteristics of Violet Tungsten Oxide are briefly described below:

As a special form of tungsten oxide, orange tungsten oxide possesses a series of unique characteristics:

I. Color: The most prominent characteristic of orange tungsten oxide is its bright orange color. This color arises from defects, impurities, or the presence of low-valent tungsten ions in the crystal structure of tungsten oxide, giving it a highly recognizable appearance.

With the rapid advancement of science and technology, sensors, as the core components for information acquisition, have their performance directly determining the technological progress and application outcomes in numerous fields. Be it smart wearable devices, environmental monitoring systems, medical diagnostic instruments, or industrial automation production lines, sensors play an indispensable role. As the requirements for sensor performance continue to rise, researchers are dedicated to exploring novel sensitive materials. Tungsten disulfide nanosheet (WS₂ nanosheet) has demonstrated remarkable application potential in the sensor field owing to its unique physical and chemical properties, and has thus become one of the research hotspots.