钨-氟共掺杂二氧化钒的水热法制备及表征

Hydrothermal synthesis and characterization of tungsten and fluorine co-doped vanadium dioxide

以五氧化二钒(V2O5)为原料,草酸为还原剂,通过水热法制备二氧化钒(VO2)纳米粉体,使用X射线衍射、扫描电子显微镜-能谱仪联用和差示扫描热量分析仪等对样品进行表征分析.研究发现,钨-氟的掺杂可降低VO2的相变温度,使其接近室温(低于25℃);控制不同的反应参数(如反应体系内液体体积)可以制得不同形貌的VO2粉体;当水热反应温度为190℃,水热反应时间为72 h,煅烧温度为800℃时,可得到晶型较完整的VO2粉体.

Using V205 as raw material and oxalic acid as a reducing agent, we prepare vanadium dioxide nanopow- ders by hydrotherrnal method and characterize samples by X-ray diffraction （XRD）, scanning electron microscopy- electronic differential system （SEM-EDS）, and differential scanning calorimetry （DSC） analyzer. Results show that the phase transition temperature of the fluorine and tungsten co-doped vanadium dioxide can beclose to room temperature （below 25 ℃ ）. The reaction systems with different reaction parameters generate vanadium dioxide powders with different morphologies such as various volume of the reaction system. At the hydrothermal reaction temperature of 190 ~（2, the hydrothermal reaction time of 72 h, and the calcination temperature of 800 ℃, the more complete crystal ,~anadium dioxide powder can be obtained.