VO_2(A)纳米杆的水热合成、生长机理及光学特性（英文）

Hydrothermal synthesis,growth mechanism and optical property of VO_2(A) nanorods

用V_2O_5和草酸作为初始原料,在水热条件下合成了VO_2(A)纳米杆.通过改变初始的V_2O_5与草酸摩尔比以及反应时间制备纯相VO_2(A).样品的元素组成、微结构及光学性能分别被X射线光电子能谱(XPS)、X射线衍射(XRD)、扫描电镜(SEM)、差示扫描量热法(DSC)和傅里叶变换红外光谱(FT-IR)表征.实验结果表明合成VO_2(A)的最佳条件为:反应温度230℃、保温24h以及V_2O_5对草酸摩尔比为1∶1.5.结合XRD数据与SEM图像,提出一个转变、自组装和重结晶过程解释了VO_2(A)纳米棒的形成过程.

VO2（A）nanorods were facilely synthesized by using V2O5 and oxalic acid as the starting materials via a hydrothermal method.The initial molar ratio of V2O5 to oxalic acid and reaction time were changed to obtain the pure VO2（A）phase. The elemental composition,microstructures and optical properties of as-obtained VO2 samples were characterized using X-ray photoelectron spectroscopy（XPS）,X-ray diffraction（XRD）,scanning electron microscope（SEM）,differential scanning calorimetry（DSC）and Fourier transform infrared spectrometer（FT-IR）.It was found that the optimal synthesis condition of VO2（A）is hydrothermal process at 230 ℃ for 24 hwith a 1∶1.5molar ratio of V2O5/oxalic acid.Combining the XRD patterns and SEM images,a transformation,assembly,recrystallization process was proposed to explain the formation process of VO2（A）nanorods.