HF－PCVD法WOx纳米微晶的制备及光催化活性

Preparation and Photocatalytic Activity of WO_x Nanocrystallites by HF-PCVD

采用HF-PCVD法，在氩-氧等离子气氛中，将WCl6进行氧化反应，经骤冷制备出纳米级的WOx微晶。把WCl6进料温度为350℃时所得微晶用TEM、XRD、XPS进行了测试。结果表明：微晶呈近球形，粒径范围为15～65nm，统计平均粒径为39．0nm，微晶为WO3和WO2.90的复合混晶体。综合分析可知：WOx纳米微晶呈包裹式层状结构，晶粒内核为WO2.90，外壳为WO3。对微晶的形成机制进行了初步探讨。苯酚降解实验表明，固定化的WOx微晶薄膜具有明显的光催化活性。

WOx Nanocrystallites were prepared by High-Frequency Plasma Chemical Vapor Deposition （HF-PCVD） when the feeding temperature of WCl6 was maintained to be 350 ℃. The properties of WOx particles including chemical composition, morphology, particle size were characterized by TEM, XRD, XPS. The results show that the most particles in the obtained WOx nanocrystallites were approximately spherical. The particle size was in the range of 15-65 nm and the mean diameter is about 39.0 nm. The structure of WOx nanocrystallite, a polycrystalline that consists of WO3 and WO2.90, is wrapped sandwich and the exterior is WO3, the interior is WO2.90. The formation mechanism of WOx nanocrystallites was briefly discussed. The catalytic activity of the immobilized film of WOx nanocrystallites, as photo-catalyst, is considerable for degradation of phenol solution.