Synthesis of Nanostructured Tungsten Oxide Thin Films
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Abstract:
A facile and inexpensive method to produce thin films of nanostructured tungsten oxide is described. A nanocrystalline tungstite (WO3·H2O) film is spontaneously formed when a tungsten substrate is immersed in nitric acid at elevated temperatures. The resulting thin film is composed of plate-like tungstite crystals with edges preferentially directed out from the substrate surface. The tungstite can easily be transformed into WO3 by annealing. Patterned WO3·H2O/W structures can be obtained by a combination of lithographic techniques and etching. In this study, the effect of exposure time, acid concentration, and temperature on the microstructure of the films has been investigated. The potential of this inexpensive synthesis method to produce large-area coatings of nanostructured tungsten oxide as well as patterned films makes it interesting for several different applications, such as batteries, gas sensors, and photocatalysts.Keywords:
Nanocrystalline material
Tungsten Oxide
In this article two kinds of tungste n oxide materials of violet tungsten oxide and tungsten blue oxide were selected to study the influence of ra w materials on ultrafine and homogen ous tungsten powder.Researching re sults showed that tungsten powder has loose structure produced in violet tungsten which is more suitable for the ult rafine hard metals.
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V. Bhat and J. Gopalakrishnan, J. Chem. Soc., Chem. Commun., 1986, 1644 DOI: 10.1039/C39860001644
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The microstructure of tungsten oxides was investigated by using scanning electron microscopy,transmission electron microscopy and so on.The results show that different tungsten oxides,including violet tungsten oxide,blue tungsten oxide and yellow tungsten oxide,are of different microstructure.Especially,violet tungsten oxide is of particular monocrystal bar structure and suitable for producing fine tungsten powders.
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Abstract are undertaken in an attempt to understand how such compounds function as catalysts, in particular as isomerization catalyst following the Fischer‐Tropsch process.
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The tungsten oxide nanoscale particles are synthesized respectively by two different chemical methods.Both of the nanoparticles are observed by TEM.The results show that the nanoparticles made by the first method over mentioned range from 70～120 nm and the finer nanoparticle can be synthesized if the second method over mentioned is used to make tungsten oxide nanoparticles.The tungsten oxide particle is reduced under the atmosphere of hydrogen and carbon at 600 ℃ to obtain nanoscale tungsten powders.Compared to tungsten oxide nanoparticles,the tungsten nanoparticles sizes range from 20 nm to 30 nm.The growing speed of tungsten nanoparticles is slow under the condition.
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The microstructure of tungsten oxides was investigated by using scanning electron microscopy, transmission electron microscopy and so on. The results show that different tungsten oxides, including violet tungsten oxide, blue tungsten oxide and yellow tungsten oxide, are of different microstructure. Especially, violet tungsten oxide is of particular monocrystal bar structure and suitable for producing fine tungsten powders.
Tungsten Oxide
Tungsten Compounds
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In this article five kinds of tungsten oxide materials of hydrogentungsten bronze (H 0.33 WO 3),ammonium tungsten bronze((NH 4) 0.5 WO 3),violent tungsten γ oxide (WO 2.72 ),tungstenyellow oxide(WO 3), mixtureof tungsten β oxideandtungsten γ oxide were selected to study the influence of raw materials on producing ultrafine and homogenous tungsten powder. Researching results show that ultrafine and homogenous tungsten powder can be produced from one phase tungsten oxide; and because of the special pore structure among WO 2.72 particles, the homogenous and ultrafine tungsten powder has loose structure which is more suitable for the ultrafine hard metals than the powders from the other TBO materials selected in this paper.[
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