Pompon Structure Tungsten Oxide

Because tungsten oxide has excellent physical and chemical properties and widespread concern researchers. They have been used to produce the electrochromic windows, infrared switch, write read rub optical devices, detect NO2, H2S, H2, NH3, O3 gas sensing components, as well as humidity and temperature-sensitive components. Meanwhile, tungsten oxide is a very good catalyst and high-temperature superconducting materials. In addition, recent studies have found that the tungsten oxide nanowires have many new properties and uses, such as excellent field emission performance, can be prepared as WS2 nanotube structure precursor.

Back in the 1950s, people began the study of tungsten oxide whisker, originally mixed gas of argon and water vapor in the 1000 ~ 1200 ℃ react with tungsten system. In recent years, there are many literature reports the preparation of one-dimensional nano material of the tungsten oxide methods, such as template method, calcined mesoporous precursor (WO-L) method, the organic solution synthesis method, a high-temperature oxidation method, and an infrared heating oxidation, etc. . In addition, high-temperature reaction of tungsten and SiO2 and WS2 and O2 respectively prepared miniature tree structure containing tungsten oxide nanorods and miniature pine tree containing micron tungsten oxide tubes and fibers. Although one-dimensional tungsten oxide nanomaterials prepared a lot, but there are generally complex process, small yield and other shortcomings. Therefore, it is necessary to further explore new and practical method of preparation.

By W powder and Ni (NO3) 2 • 6H2O in molybdenum reaction kit package prepared pompon micron scale structure of tungsten oxide. Velvet globular structure by a few hundred microns in length, an outer diameter of the tube 1 ~ 10μm micron and sub-micron diameter 100500nm fibers. X-ray diffraction and transmission electron microscopy analyzes showed that: the product is a good crystal structure along the [010] W18O49 growth direction of the monoclinic structure. These pompon structure of tungsten oxide by Vapor-Solid (VS) growth mechanism of formation because it has a huge surface area, has great prospects in terms of micro-sensitive semiconductor components.

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