表面活性剂辅助水热合成VO_2纳米晶  

Synthesis of VO_2 nanocrystalline via surfactant-assisted hydrothermal method

作　　者：罗民[1] 高积强[1] 张笑[1] 欧阳达[1] 朱建峰[1] 

机构地区：[1]西安交通大学金属材料强度国家重点实验室

出　　处：《宁夏工程技术》2005年第4期359-362,共4页Ningxia Engineering Technology

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.Vanadium dioxide nanopowders and nanorods had been synthesized from V205 sol and quaternary ammonium salt （CTAB） as structure-directing templates under hydrothermal conditions. Surfaetant templates were demonstrated to be appropriate for the formation of vanadium dioxide nanocrystalline. The samples were characterized by XRD,TEM, SEM, and IR, The results indicated that the nanocrystalline 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.

关 键 词：纳米结构 VO2 表面活性剂 辅助水热合成 

分 类 号：O766[理学—晶体学] TQ110.6[化学工程—无机化工]