生长在Si基底上VO_x纳米管形貌的时间影响因子及其气敏性初探  

Time influence factor of vanadium oxide nanotube on Si substrate and initial gas sensing test

作　　者：李明阳[1] 于明朗[1] 苏庆[1] 刘雪芹[1] 谢二庆[1] 张晓倩[1] 

机构地区：[1]兰州大学物理学院,兰州730000

出　　处：《物理学报》2012年第23期362-368,共7页Acta Physica Sinica

摘　　要：采用水热法成功制备了在Si基底上的钒氧化物纳米管.通过X射线衍射、拉曼光谱、扫描电子显微镜对纳米管的结构和形貌进行了表征,测试了在不同的搅拌时间和水热反应时间下纳米管形貌的变化以及气敏性质.着重探讨了不同的搅拌时间和水热反应时间对样品形貌和气敏特性的影响.结果表明,水热反应时间越长,样品管状形貌越好,边缘越平滑.其气敏敏感度越好,响应时间也比水热反应时间短的样品要快.VO_X纳米管内径分布在25—35 nm,外径分布在65—100 nm.Vanadium oxide nanotubes are prepared on a Si substrate with hydrothermal method in this experiment with dodecylamine serving as template. X-ray diffraction, Raman spectroscopy and scanning electron microscope （SEM） are employed to characterize the structural and electronic properties of these nanotubes. The results show that the growth of VOx nanotubes and their gas sensing properties are affected by the hydrothermal reaction time rather than mixing time. With longer reaction time, the VOx nanotubes display better properties with smoother walls, stronger gas sensitivity and faster response time （15 s）, than with shorter reaction time. SEM results reveal that VOx nanotubes have inner diameters between 25-35 nm and outer diameters between 65-100 nm. The sample inner diameters vary between 25 and 35 nm. The outer diameters are also quite similar in all tubes and lie between 65 and 100 nm.

关 键 词：水热法 VOx纳米管 反应时间 气敏 

分 类 号：TB383.1[一般工业技术—材料科学与工程]