深圳大学学报理工版

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 V2O5 as raw material and oxalic acid as a reducing agent, we prepare vanadium dioxide nanopowders by hydrothermal 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 ℃, the hydrothermal reaction time of 72 h, and the calcination temperature of 800 ℃, the more complete crystal vanadium dioxide powder can be obtained.

引言
1 实验
2 结果与讨论
3 结语

图1 水热法制备VO2的XRD图谱<br/>Fig.1 XRD pattern for the pure VO2 powder prepared by hydrothermal method

图1 水热法制备VO2的XRD图谱
Fig.1 XRD pattern for the pure VO2 powder prepared by hydrothermal method

图2 不同钨-氟掺杂摩尔分数的VO2粉体(V1-mWmO2-nFn)的XRD图谱<br/>Fig.2 XRD patterns for tungsten and fluorine co-doped vanadium dioxide powders(V1-mWmO2-nFn)

图2 不同钨-氟掺杂摩尔分数的VO2粉体(V1-mWmO2-nFn)的XRD图谱
Fig.2 XRD patterns for tungsten and fluorine co-doped vanadium dioxide powders(V1-mWmO2-nFn)

图3 不同水热反应体积下钨-氟共掺杂VO2粉体的SEM图<br/>Fig.3 SEM patterns for tungsten and fluorine co-doped vanadium dioxide powders under different reaction volumes

图3 不同水热反应体积下钨-氟共掺杂VO2粉体的SEM图
Fig.3 SEM patterns for tungsten and fluorine co-doped vanadium dioxide powders under different reaction volumes

图4 V0.95W0.05O1.90F0.10纳米粉体的EDS测试图<br/>Fig.4 EDS pattern for V0.95W0.05O1.90F0.10

图4 V0.95W0.05O1.90F0.10纳米粉体的EDS测试图
Fig.4 EDS pattern for V0.95W0.05O1.90F0.10

表1 V0.95W0.05O1.90F0.10纳米粉体的EDS测试<br/>Table 1 EDS table of V0.95W0.05O1.90F0.10

表1 V0.95W0.05O1.90F0.10纳米粉体的EDS测试
Table 1 EDS table of V0.95W0.05O1.90F0.10

图5 不同掺杂摩尔分数VO2未分体<br/>(V1-mWmO2-nFn)的DSC谱图<br/>Fig.5 DSC patterns for tungsten and fluorinco-doped vanadium dioxide powders

图5 不同掺杂摩尔分数VO2未分体
(V1-mWmO2-nFn)的DSC谱图
Fig.5 DSC patterns for tungsten and fluorinco-doped vanadium dioxide powders

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备注

引言

1 实验

2 结果与讨论

3 结语

期刊信息

备注

引言

1 实 验

2 结果与讨论

3 结 语

期刊信息

1 实验

3 结语