Pyrochlore Tungsten Oxide Microtubes Producing Method

The discovery of carbon nanotubes in 1991 has inspired people to study and explore the tubular structure. Scientists have been through a variety of methods successfully synthesized many tubular inorganic compounds (such as metal oxides, metal sulfides, metal halide, etc.). Pyrochlor tungsten oxide (often denoted H2W2O7 or WO3.0.5H20) with the same distorted octahedral WO6 structural motifs, by the angle of the top of the tungsten oxide rigid skeleton to build a layered structure having a six-membered ring channel. Because having a network structure and properties of metastable molecular sieve, it has been widely used in the fields of catalysis, electrochromic, fuel cells, light-sensitive gas sensors and the like.

The tubular structure having a hollow structure in which you can provide additional space for the stability of its structure and the characteristics of the alkali metal ions, which makes its application greatly anode material in rechargeable batteries and catalysts. Moreover, because of the larger surface area, the tubular structure in the photosensitive and gas sensor also has great prospects. So if we can synthesize this tubular pyrochlore type oxide, tungsten can be advantages and tubular structure of tungsten oxide pyrochlore type combination, and even some new properties.

A pyrochlore type oxide, tungsten preparation micron tube, wherein: Add 6-10mM thiourea and 3~13mM hydroxylamine hydrochloride prepared in hydrothermal pyrochlor tungsten oxide solution, pH value of 4 to 8 After sufficient stirring conditions, the mixed solution was poured into the reaction kettle 18-30 hours, taken out until the temperature naturally cooled to room temperature, centrifugation, vacuum drying. Thiourea aspect of the invention to destroy hydrogen pyrochlore type structure of tungsten oxide layered edge of the layered structure becomes unstable, then between pyrochlor weakened tungsten oxide layer and the inner layer of the same effect, so wound or produce a tubular structure; on the other hand, to control the use of hydroxylamine hydrochloride solution viscosity, reduce agglomeration of the tubular structure. This preparation method is not only simple, easy to operate, and reduce production costs, is both economical and environmentally friendly production method.


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