Tungsten electrodes tip shapes can be flat, sharpened or rounded. Flat tip is cut by grinding wheel, molybdenum wire or machining. Sharpening is much more difficult. And both shapes and welding current will influence the life time of electrodes.

During the process of nanostructured WO3 synthesis it is found that citric acid content, system pH value before hydrothermal synthesis, hydrothermal reaction temperature and hydrothermal reaction time will have great influence on the product, therefore the following will focus on several influence factors affecting the phase and morphology of nanostructured WO3.

Liquid phase method is the most widely used method among many methods for synthesizing nano tungsten trioxide. Its advantage is that the nano structured WO3 particles are fine and evenly distributed, the content of the chemical components can be precisely controlled, the morphology of the nanostructured WO3 can be controlled by adjusting the morphology control agent, the synthetic process is simple, economical and good to mass production. There are four main methods including hydrothermal synthesis, sol-gel method, precipitation method and microemulsion method.

This article will discuss the gas sensitivity of nano plate shaped tungsten trioxide gas sensor at different concentration of ethanol gas, acetone gas, ammonia gas and formaldehyde gas in terms of temperature-sensitivity. As semiconductor material with good sensitivity to various toxic gases, nanostructured tungsten trioxide can effectively improve the sensitivity and response speed of gas sensors. The gas sensor using nanostructured tungsten trioxide as gas sensitive material can be done to make lower thickness detection of target gas, which can greatly decrease the harm of noxious gas to human health. Therefore, the research of nanostructured WO3 is good to make full use of its good semiconductor property, improve its value in the gas sensing field, and provide better semiconductor material.

For GTAW welding, tungsten electrodes are chosen for its good properties of low electric discharged powder, good welding arc, high temperature resistance, sharpening machinability and low radiation. There are many grades are suitable for the welding, difficult welding objectives and conditions, different grade is applied.

There are many preparation methods of tungsten disulfide nanoparticles. Tungsten disulfide is  two-dimensional material with layered structure and has excellent semiconductivity and diamagnetism. It is insoluble in acid, alkali and alcohol, and has certain reducibility, which can react with aqua regia, nitric acid and hot concentrated sulfuric acid, and is able to be oxidized to WO3 in air and oxygen atmosphere.

Tungsten disulfide has wide application and is the compound of tungsten and sulfur with chemical formula WS2. It is black, insoluble in water and organic solvents, not react with acid and alkali except the mixture of concentrated nitric acid and hydrofluoric acid as well as aqua regia. It is nontoxic and nonmagnetic.

The friction and wear property of tungsten disulfide nano powder is a new topic, as a new type of solid lubricating material, tungsten disulfide has excellent lubricating property, it has a layered hexagonal structure, the W and S elements in the layer are combined by covalent bond, and the molecular bond formed by S-S in the layer is combined. Because of the low bond energy of the latter, it is easy to slip during the friction process, so it has lower friction coefficient.

Currently tungsten oxide has been widely used in electrochromic intelligent glass, optical device, supercapacitor, gas sensor, photocatalysis, photothermal therapy and other application fields. With the rapid development of nano science and technology, more and more synthesis methods of nano tungsten oxide are available, mainly has there kinds of methods including vapor deposition, liquid-phase synthesis and solid-phase synthesis.

Tungsten oxide is the potential oxide material in the energy field for its rich content in the earth, highly adjustable composition, high chemical stability at low pH value and excellent conductivity. Now it has wide application in seven fields including electrochromic and photochromic, lithium-ion battery anode materials and heat insulation materials, etc.