Hexagonal Tungsten Oxide Synthesis

Transition metal oxides are tungsten oxide, which is a n-type semiconductor, there is a wide band gap (2.5 ~ 3.5eV). It has a photochromic, electrochromic, photochromic gas and other characteristics, in terms of information on functional materials, catalysis, magnetic materials, information memory device, a display piece and others have a wide range of applications.
 

Low temperature hydrothermal synthesis method is commonly used method for producing tungsten oxide nanomaterials under hydrothermal conditions for obtaining tungsten oxide nanoparticles with different morphologies, aid played a key role, can effectively control the growth direction of the crystal. Fibrous tungsten oxide having a large specific surface due to the advantages in catalysis concern. Size and distribution of high quality nanofibers one must have the basic features, in order to achieve the above purpose, in the preparation of the crystal during the growth process and hope to form nuclei nuclei is well controlled to avoid the growth process nuclei high local concentrations simultaneously homogeneous nucleation and heterogeneous nucleation, resulting in non-uniform dispersion particle size. Now often used as an adjuvant to obtain a sulfate nanofibrous tungsten oxide, common with ammonium sulfate, potassium sulfate, etc., and no use of sulfuric acid has been reported as an adjuvant guanidine, guanidine sulfate as an adjuvant preparation of nano tungsten oxide process , the auxiliary agent is not directly reacted with the sodium tungstate, but hydrolysis by sulfuric acid guanidine structure crystal ion SO2-4, NH + 4 is reacted with sodium tungstate. Guanidine sulfate under hydrothermal conditions is a process of slow hydrolysis reaction, to control the entire nanofiber growth process, and thus will not cause a sudden increase in the reactant solution, the crystal structure of the ion can be uniformly distributed in the various parts of the solution, and the reaction sodium tungstate was mixed at the molecular level can be achieved, thus ensuring a uniform solution throughout the fibrous generated tungsten oxide.

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