均匀自支撑的二氧化钒纳米线的水热合成及相变特性研究（英文）  

Hydrothermal Synthesis and Phase Transition Properties of Uniform Free-standing Vanadium Dioxide Nanowires

作　　者：嵇海宁[1] 刘东青[1] 程海峰[1] 张朝阳[1] 杨力祥 郑文伟[1] 

机构地区：[1]国防科技大学新型陶瓷纤维及其复合材料重点实验室,湖南长沙410073

出　　处：《稀有金属材料与工程》2017年第12期3601-3605,共5页Rare Metal Materials and Engineering

基　　金：National Natural Science Foundation of China(51502344)

摘　　要：二氧化钒(VO_2)在接近室温时发生由半导体态向金属态的Mott相变,在智能窗和红外自适应伪装技术领域具有一定的应用前景。采用一种新颖的水热法制备了均匀自支撑的VO_2纳米线。合成的纳米线的直径为150±30 nm,长度达到几十微米。通过X射线衍射、X射线光电子能谱、高分辨透射电镜和选取电子衍射等手段验证了高纯单斜相VO_2纳米线的成功制备。而且,VO_2纳米线的可逆相变性能采用差示量热扫描、变温XRD和变温Raman光谱进行了探究。结果表明:VO_2纳米线升温相变点为65.2℃,磁滞回线宽度窄至6.5℃,具有良好的可逆相变性。这些为VO_2纳米线的金属-半导体相变研究提供基础。Vanadium dioxide（VO2） undergoes a Mott metal-insulator transition（MIT） close to room temperature,and has been suggested as a candidate for use in smart window and adaptive infrared camouflage.Here we report the synthesis of uniform free-standing VO2 nanowires using a novel hydrothermal method.The synthetic nanowires have typical diameters of 150±30 nm and lengths of tens of micrometer.These VO2 nanowires exhibit high crystallinity and a pure monoclinic phase,which were characterized by X-ray diffraction,X-ray photoelectron spectroscopy,high resolution transmission electron microscopy and selected area electron diffraction.Moreover,reversible phase transition properties of VO2 nanowires are monitored via differential scanning calorimetry,variable temperature X-ray diffraction and temperature-dependent Raman spectroscopy.The results show VO2 nanowires obtained exhibit a reversible phase transition with an endothermic phase transition at 65.2 °C and a narrow hysteresis width of 6.5°C.These VO2 nanowires should be promising materials for fundamental investigations of nanoscale metal-insulator transitions.

关 键 词：二氧化钒 纳米线 水热法 相变 

分 类 号：TB383.1[一般工业技术—材料科学与工程]