WO3, an n-type semiconductor, is an excellent gas-sensing material and has good sensitivity to toxic gases such as NO2. According to the experts, in recent years, with the rapid development of economy and industry, toxic gases such as NO2 have caused serious environmental pollution problems, such as acid rain, photochemical smog, etc. Due to their toxicity and destructiveness, the detection of NO2 and other toxic gases has paid much attention.

WO3 nanoparticles are often made into gas sensor for detecting various toxic gases. For example, WO3 nano particles have high sensitivity and selectivity to trimethylamine and high sensitivity to acetic acid, acetaldehyde, acetone, and ethanol gas.

WO3 nanopowder is n-type semiconductor that has wide applications in smart windows, gas sensors, etc., so it has been paid much attention including its preparation. Here is a preparation method of WO3 nanopowder.

WO3 nanopowder is a typical n-type gas-sensing material that has high sensitivity and selectivity to toxic gases, so it has a wide application in gas sensor to detect various hazardous gases. Especially for trimethylamine gas, the reaction is rapid, and the sensitivity is very high. It means that the WO3-based gas sensor provides a quick, convenient, and accurate detection method for detecting whether fish or shellfish food has deteriorated. Also, the gas sensor based on WO3 nano particles has the advantages of low power consumption, low cost and convenient operation. So, WO3 has attracted much attention.

As a semiconductor gas sensing film material, WO3 film has good sensitivity to NOx, H2S, H2, CH4, C2H5OH, CO, NH3 and other gases, so it has broad application prospects. Therefore, the preparation of WO3 film has been paid much attention. Here is a preparation method of WO3 film.

WO3 film, an n-type semiconductor, is used as an excellent thin film gas-sensing element in applications of gas sensors. You know, WO3 is a typical n-type gas sensing material that has attracted considerable attention to detect various hazardous gases, in the form of nano particles or thin films.

As a gas sensing material, WO3 on the nanoscale has good gas sensitivity and selectivity towards H2, CO, H2S, NH3, NOx, O3 as well as some organic gases. WO3 nano powder is a typical n-type semiconductor that is considered to be the promising material to fabricate the gas sensor, which has a widespread utilization in the environment detecting and the safety monitoring. When WO3 nanopowder contacts the gas to be measured, its resistance changes, so that the output signal changes accordingly to achieve the purpose of gas detection.

Tungsten alloy cluster bomb, which is also known as tungsten alloy cluster munition, is a container filled with small explosive bombs called “sub-munitions.” This container may be a shell, rocket, missile, or other device. Dropped from an aircraft or fired from the ground, it opens in the air and releases the tungsten alloy sub-munitions. This scatters a carpet of bombs over a large area without any degree of accuracy, to attack cluster targets such as cluster tanks, armored combat vehicles, military assembly sites, or large area targets such as airport runways.

Tungsten alloy applied for military defense is tungsten heavy alloy that is 90% to 97% pure tungsten in a matrix of nickel and copper, or nickel and iron. Why these alloying elements are necessary? That is because pure tungsten is very difficult to machine or fabricate, addition of these elements improves both the ductility and machinability of the alloys while retaining its high density. These tungsten heavy alloys are ideal for high density applications where machining is required. For example, tungsten alloy is widely used as the cores of armor-piercing projectiles, the shaped charge liners of shaped charges, the warheads of rockets and artillery shells, the rotors of missile gyroscopes, the projectiles of clusters, etc.

Tungsten alloy applied for gyroscope of antiship missile is an alloy composed of tungsten (W) as a matrix and Ni, Fe, Cu, Co, Mn and other alloying elements to form a composite structure of tungsten particles and bonding phase. The navigation gyroscope is the heart of navigation and control systems of antiship missiles and even submarines, torpedoes, satellites, rockets, and aircraft. At present, there are various advanced navigation technologies in the world, but the inertial guidance gyroscope is still the most widely used navigation instrument in the world.