The Synthesis And Performance Study Of Semiconductor Nanometer Materials Based On Tungsten

In recent years, the semiconductor nanometer materials based on tungsten have drawn more and more attention especially tungsten oxide nanomaterials. Tungsten oxide especially non-stoichiometry tungsten oxide (such as WO2.9, WO2.83, WO2.72 and so on) has a stable crystal phase and possesses wide absorption region. These unique properties make tungsten oxide have extensive application prospect in photocatalysis, electrochemistry, photothermal therapy and gas sensing and so on. In this paper, monodispersed W17O47 nanoneedles have been prepared via one-pot wet chemical strategy, reaction conditions have been studied, the production has been described and the characters of production has been explored. Meanwhile, W17O47@MoS2 nanocrystalline has been prepared by solvent thermal synthesis method and its electrochemical properties have been explored. The main achievements were expressed as follows:Monodispersed W17O47 nanocrystalline has been prepared via one-pot wet chemical strategy. Many reaction conditions have been investigated and then the optimum condition was chosen. Then W17O47 nanoneedles were subsequently transferred into aqueous solution by modifying with amphiphilic polyvinylpyrrolidone (PVP) for using in biological and detecting the photothermal characters. We found that the temperature of W17O47 nanomaterial rose about 25? in 6 minutes under irradiation of 808 nm NIR light. It proved W17O47 nanomaterial has great photothermal properties and could be used in photothermal imaging and photothermal therapy.W17O47@MoS2 nanocrystalline has been prepared through two-pots strategy. Experimental results showed that the nanomaterials synthesized in this method have good electrochemical catalytic activity for hydrogen evolution reaction. And this may be because that the MoS2 was loaed on the surface of W17O47 nanoneedles So W17O47@MoS2 nanocrystal will exposes more active sites due to W17O47 nanoneedles which have large specific surface area and exhibit good electrochemical catalytic activity for hydrogen evolution reaction. The W17O47@MoS2 nanocrystal synthesized by this method was tested electrochemical performances after dealing with acetic acid. And we found that the electrochemical catalytic activity for hydrogen evolution reaction of W17O47@MoS2 nanocrystal was better than W17O47 nanoneedles.