摘要
提出了一种采用草酸氧钒（VOC2O4·H2O）热分解制备纳米VO2的方法。通过热分析（TG-DSC）、XRD和TEM手段，分析了草酸氧钒前驱体的热分解过程，纳米VO2的结构和形貌，测定了纳米VO2粉体的电阻-温度曲线。实验结果表明VOC2O4·H2O热分解开始温度为343℃，在380℃，真空度为20-50Pa的条件下，热分解获得VO2的平均尺寸为22nm，相变温度为69℃。
A new preparation method of VO2 nanopowders by the means of thermal decomposition of vanadium oxalate VOCaO4·H2O was put forward in this paper. By means of thermal analyses （TG-DSC）, XRD and TEM, the thermal decomposition process of VOC2O4·H2O precursor,crystal structure and morphology of VO2 nanopowders were analysed and its curve of resistance-temperature was tested. The thermal analyses results show that thermal decomposition of VOC2O4 ·H2O precursor begins at 343℃. In our experiment, thermal decomposition temperature 380℃ and the furnace pressure 20-50Pa,was adopted and under this experiment condition the mean crystallite size of prepared VO2 nanopowders is 22nm and phase transition temperature is about 69℃.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2006年第3期440-441,445,共3页
Journal of Functional Materials
基金
四川省科技厅资助项目(04JY029-072-1)
关键词
VO2
热致变色材料
相变
热分解
vanadium dioxide
thermochromic materials
phase transition
thermal decomposition
