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首页> 外文期刊>RSC Advances >Local structural studies on Co doped ZnS nanowires by synchrotron X-ray atomic pair distribution function and micro-Raman shift
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Local structural studies on Co doped ZnS nanowires by synchrotron X-ray atomic pair distribution function and micro-Raman shift

机译：同步加速器X射线原子对分布函数和微拉曼位移研究Co掺杂ZnS纳米线的局部结构

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Micro-flowers consisting nanowires of pure and cobalt-doped ZnS samples were synthesized via a hydrothermal method. The atomic structures of the obtained nanowires (NWs) were studied by X-ray atomic pair distribution function (PDF) analysis and total synchrotron X-ray scattering. The PDF method was used to describe the wurtzite structure of the as-synthesized samples and the results suggested that a cation–cation (Zn2+–Zn2+) distance of 3.8343–3.7733 ? with a coordination number ～4 for the wurtzite structure. The diameters of the samples were evaluated using the PDF data and were in good agreement with the TEM results. Raman spectra of the Co-doped ZnS NWs exhibited a first-order phonon mode at 349.34, 347.08, and 344.70 cm?1, corresponding to the A1/E1 longitudinal-optical-phonon vibration mode, in addition to the strong surface optical (SO) phonon mode observed at 330 and 333 cm?1. In the Raman spectra, the peak position of the longitudinal-optical-phonon plasmon coupled mode was shifted to higher frequencies with increasing the cobalt concentration. It was observed that the energy band gap kept on decreasing with increases in the cobalt content. XPS analysis revealed that the chemical state and S vacancies could be controlled by varying the amount of cobalt content in the NWs. The FTIR spectra demonstrated that the sharp peaks were mainly due to all manner of bending vibrations within the NWs observed in the fingerprint region (400–1500 cm?1). The peaks observed at 1038.5, 1163; 1027, 1150; 1011, 1150; 1019.4, 1133 cm?1; and 1011, 1158 cm?1 were due to the formation of a microstructure for the pure and Co-doped ZnS samples, respectively.
机译：通过水热法 合成了由纯净和钴掺杂的ZnS样品的纳米线组成的微花。通过X射线原子对分布函数（PDF）分析和总同步加速器X射线散射研究了所得纳米线（NWs）的原子结构。 PDF方法用于描述合成样品的纤锌矿结构，结果表明阳离子-阳离子（Zn 2 + –Zn 2 + ）距离为3.8343–3.7733？纤锌矿结构的配位数为〜4。使用PDF数据评估了样品的直径，并与TEM结果非常吻合。 Co掺杂的ZnS NW的拉曼光谱在349.34、347.08和344.70 cm ？1 处表现出一阶声子模，对应于A 1 / E 1 纵向光子声子振动模式，以及在330处观察到的强表面光学（SO）声子模式和333 cm ？1 。在拉曼光谱中，随着钴浓度的增加，纵向光子-声子等离子体激元耦合模式的峰值位置移至更高的频率。观察到能带隙随着钴含量的增加而持续减小。 XPS分析表明，可以通过改变NW中钴含量的数量来控制化学状态和S空位。 FTIR光谱表明，尖峰主要归因于在指纹区域（400–1500 cm ？1 ）中观察到的NW内部的各种弯曲振动。在1038.5，1163处观察到峰; 1027、1150; 1011、1150; 1019.4，1133 cm ？1 ; 1011和1158 cm ？1 分别是由于纯锌和共掺杂ZnS样品的微观结构形成。

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