Templating rare-earth hybridization via ultrahigh vacuum annealing of ErCl3 nanowires inside carbon nanotubes
Templating rare-earth hybridization via ultrahigh vacuum annealing of ErCl3 nanowires inside carbon nanotubes
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DOI：
10.1103/physrevb.83.085407
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发表时间：
2011-02-11
影响因子：
3.7
通讯作者：
Pichler, Thomas
中科院分区：
文献类型：
--
作者：
Ayala, Paola;Kitaura, Ryo;Pichler, Thomas
在这里，我们报告了控制碳纳米管（CNT）纳米反应器内稀土元素的有效杂化和电荷转移。碳纳米管内部的管状空间可以封装一维 (1D) 晶体，例如 ErCl3，我们将其用作起始材料。在超高真空中应用热化学反应，我们获得了仍然封装在碳纳米管中的单质铒纳米线。通过高能光谱直接获取 Er 4d 和 3d 边缘的杂化程度和有效电荷变化。研究发现，Er 是三价的，但填充 Er 的管的有效价态降低，这强烈表明纳米管 pi 态和 Er 5d 轨道之间的杂化增加。 C1s-x 射线吸收光谱 (XAS) 中测定的导带响应也证明了这一点。这些结果对这些以及类似的稀土纳米线混合物的一维电子和磁性特性具有重要意义。
Here we report on controlling the effective hybridization and charge transfer of rare-earth elements inside a carbon nanotube (CNT) nanoreactor. The tubular space inside CNTs can encapsulate one-dimensional (1D) crystals such as ErCl3, which we have used as a starting material. Applying a thermochemical reaction in ultrahigh vacuum, we obtain elemental Er nanowires still encapsulated in the CNTs. The hybridization degree and the effective charge changes were directly accessed across the Er 4d and 3d edges by high-energy spectroscopy. It was found that Er is trivalent but the effective valence is reduced for the Er-filled tube, which strongly suggests an increased hybridization between the nanotube pi states and the Er 5d orbitals. This was also evidenced by the conduction band response determined in C1s-x-ray absorption spectroscopy (XAS). These results have significant implications for the 1D electronic and magnetic properties of these and similar rare-earth nanowire hybrids.