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表面活性剂辅助水热合成VO₂纳米晶

Synthesis of VO₂ nanocrystalline via surfactant-assisted hydrothermal method

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【Author】 LUO Min1,2,GAO Ji-qiang1,ZHANG Xiao1,OUYANG Da1,ZHU Jian-feng1(1.State Key Laboratory for Mechanical Behavior of Materials,Xi’an Jiaotong U niversity,Xi’an 710049,China; 2.College of Chemistry and Chemical Engineering,Ningxia University,Yinchuan 750021,China)

【机构】西安交通大学金属材料强度国家重点实验室；西安交通大学金属材料强度国家重点实验室陕西西安710049；宁夏大学化学化工学院；宁夏银川750021；陕西西安710049；

【摘要】在水热条件下,以V2O5溶胶为钒源、表面活性剂——十六烷基三甲基溴化胺(CTAB)为模板剂合成了两种VO2(B)纳米晶,即纳米粉和纳米针;用扫描电镜、透射电镜、X射线衍射和红外光谱表征了材料的表面形貌和晶体结构.结果表明:纳米晶的晶体结构是VO2(B)相-单斜结构,纳米粉的粒径d=50～100nm;纳米针直径d=50～100nm,l=1～2μm.分析了表面活性剂和水热反应时间对产物粒径和形貌的影响:表面活性剂可以将产物粒径有效地控制在纳米尺寸内,随着水热反应时间的延长,晶体化程度越完全;伴随颗粒大小的增加,产物的形貌从纳米球、纳米棒逐渐过渡到纳米针;并对不同形貌的VO2纳米晶形成机制作了理论探讨.更多还原

【Abstract】 Vanadium dioxide nanopowders and nanorods had been synthesized from V2O5 sol and quaternary ammonium salt(CTAB) as structure-directing templates under hydrothermal conditions.Surfactant templates were demonstrated to be appro priate for the formation of vanadium dioxide nanocrystalline.The samples were characterized by XRD,TEM,SEM,and IR.The results indicated that the nanocrystal line obtained was VO2(B) crystal structure.Diameters vanadium dioxide nanopowders of were from 50～100 nm.Vanadium dioxide nanorods were always 1～2 μm in length and the diameters were between 50～100 nm.The probable formation mechanism of vanadium dioxide had been investigated.更多还原