Tungsten Oxide Merits
(1)Tungsten oxide has gas sensitive, it is used to detect nitrogen dioxide, ammonia and other toxic gases. Tungsten oxide thin film gas sensor and tungsten oxide nano particles improve the efficiency of testing low concentration toxic gas.
(2) Tungsten oxide is widely applied in our daily life. It is often used in industrial X-ray screen phosphors and fireproof fabric to manufacture tungstate. Because of its yellow agent, it is also used as painting and coating in ceramics. Tungsten oxide is used to produce electrochromic smart window. These windows has electric switches. The color of window would change through temperature and light. Another application is high density inert metal powder, which was used in the war between Israel and Gaza strip in 2008-2009.
Tungsten oxide demerits:
（1）Tungsten oxide has toxicity, make contact with tungsten compounds will stimulate the upper respiratory tract and deep respiratory tract. Affected by dust will cause bronchial asthma, gastrointestinal disorders. Also affecting the skin which causes tubercule and scales. In America, the solubility limited for tungsten and tungsten soluble compounds is 1mg/m, insolubility of tungsten compounds is 5mg/m. Operators need to wear anti-poison respirator, gloves, glasses and garment of clean room to prevent dust leakage. So workers need to take body check and do the regular physical check.
（2）Tungsten oxide has stimulation toward human's eyes and skin. During the operating process, making contact or inhalating tungsten oxide will make people be general weakness, fever, rash, proteinuria. Although tungsten oxide is not flammable, but easy to react with halogen compounds, bromine pentafluoride, chlorine trifluoride and cause harmful toxic fumes.