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首页> 外文期刊>Nanotechnology >X-ray diffraction and Raman scattering studies on large-area array and nanobranched structure of 1D MoO_2 nanorods
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X-ray diffraction and Raman scattering studies on large-area array and nanobranched structure of 1D MoO_2 nanorods

机译：一维MoO_2纳米棒的大面积阵列和纳米支化结构的X射线衍射和拉曼散射研究

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摘要

One-dimensional (1D) MoO_2 nanorods in the form of a large-area array and nanobranched structure were prepared by hot-filament metal-oxide vapour deposition at low and high pressures in atmospheric argon flows respectively. The x-ray diffraction (XRD) patterns of both as-synthesized samples show that the 1D MoO_2 nanorods are monoclinic crystals in space group P2_(1/c). The Raman spectrum of the large-area array of 1D MoO_2 nanorods appears to be the same as that of a two-dimensional (2D) MoO_2 thin film. The Raman spectrum of the nanobranched structure of 1D MoO_2 nanorods showed a downshift and asymmetric broadening of the Raman first-order TO peak when compared with the bulk (q = 0) mode. The Raman shift and broadening were attributed to phonon confinement effect in the 1D nanorods. The in situ Raman spectra of laser-induced oxidation of the nanobranched structure of 1D MoO_2 nanorods demonstrate that they can be oxidized easily and more strongly than the 3D bulk MoO_2 powder.
机译：通过分别在低压和高压下在大气氩气流中进行热丝金属氧化物气相沉积，制备了大面积阵列和纳米支化结构形式的一维（1D）MoO_2纳米棒。两种合成样品的X射线衍射（XRD）图谱均表明，一维MoO_2纳米棒是空间群P2_（1 / c）中的单斜晶体。一维MoO_2纳米棒大面积阵列的拉曼光谱似乎与二维（2D）MoO_2薄膜的拉曼光谱相同。与本体（q = 0）模式相比，一维MoO_2纳米棒的纳米支化结构的拉曼光谱显示出拉曼一阶TO峰的下移和不对称扩宽。拉曼位移和展宽归因于一维纳米棒中的声子限制效应。一维MoO_2纳米棒的纳米支化结构的激光诱导氧化的原位拉曼光谱表明，与3D块状MoO_2粉末相比，它们可以更容易地被氧化并且强度更高。

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