A study of tungsten oxide nanowires self-organized on mica support
A study of tungsten oxide nanowires self-organized on mica support
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DOI：
10.1088/0957-4484/20/44/445604
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发表时间：
2009-10
期刊：
影响因子：
3.5
通讯作者：
I. Matolínová;M. Gillet;E. Gillet;V. Matolín
中科院分区：
文献类型：
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作者：
I. Matolínová;M. Gillet;E. Gillet;V. Matolín
自组织直纳米线 WO3 已在低过饱和条件下在白云母上外延生长。通过扫描电子显微镜（SEM）、X射线衍射（XRD）和X射线光电子能谱（XPS）对所制备的纳米结构的形貌、结构和化学成分进行了研究。 SEM 使我们能够同时观察纳米线网络和基底电子通道模式 (ECP)，从而确定纳米线生长的晶体方向。实验结果表明，直WO3纳米线优先取向平行于云母的三个高对称晶向中的两个[100]和[110]或[100]和[100]和。 XRD 和 XPS 测量表明，非常细的六方钨青铜纳米线在生长的第一阶段发生自组装，随后形成化学计量的 WO3。研究了不同制备条件下的生长机制，特别关注云母表面钾离子的作用。基于所获得的结果，提出了云母上氧化钨纳米线的生长模型。
Self-organized straight nanowires of WO3 have been epitaxially grown on muscovite mica in low super-saturation conditions. Morphology, structure and chemical composition of the prepared nanostructures have been investigated by scanning electron microscopy (SEM), x-ray diffraction (XRD) and x-ray photoelectron spectroscopy (XPS). SEM permits us to observe nanowire networks and substrate electron channeling patterns (ECP) simultaneously and thus to determine crystallographic direction of nanowire growth. The experimental results show that straight WO3 nanowires are orientated preferentially parallel to two of three high symmetry crystallographic directions of mica [100] and [110] or [100] and . XRD and XPS measurements indicated self-assembly of very thin nanowires of hexagonal tungsten bronze in the first stage of growth followed by the formation of stoichiometric WO3. The growth mechanism has been studied as a function of different preparation conditions with special focus on the role of potassium ions present on the mica surface. Based on obtained results a growth model of tungsten oxide nanowires on mica is proposed.