水热合成过程中VO_2(B)纳米带的结构变化

Structural changes in VO_2(B)nanobelts in hydrothermal process

以V2 O5和草酸的黄褐色悬浊液为前驱物水热合成 VO2（B）纳米带，采用XRD技术研究水热条件对V O 2（B ）纳米带结构的影响。结果表明，在水热温度为180～190℃、水热时间为20～24 h时，可以制备结晶良好的VO2（B）纳米带；随着水热温度的升高，VO2（B）纳米带的平均晶粒尺寸逐渐增大，晶格畸变度逐渐减小，且产物的择优生长趋势逐渐明显；水热反应初期，VO2（B）纳米带的平均晶粒尺寸增长较快，随着水热时间的延长，VO2（B）纳米带的晶粒生长趋于平衡，晶格畸变度逐渐减小并趋于平缓，且产物逐渐形成了一定的结晶取向。

Effects of different hydrothermal conditions on the structure of VO2 （B） nanobelts which used V2 O5 and oxalic acid as raw materials were studied by XRD method .The results indicate that the optimum hydrothermal temperature and time to prepare the perfect VO 2 （B） nanobelts are 180~190℃ and 20~24 h respectively .The average grain size of VO2 （B） nanobelts increases ,the lattice dis-tortion degree decreases ,and the products pack along a direction with the increase of hydrothermal temperature .The grain size of VO2 （B） nanobelts increase especially at initial stages ,the lattice dis-tortion degree decreases especially at initial stages ,and the products pack along a direction with the prolonging of hydrothermal time .