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首页> 外文期刊>Advanced Functional Materials >Concentric Sub-micrometer-Sized Cables Composed of Ni Nanowires and Sub-micrometer-Sized Fullerene Tubes
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Concentric Sub-micrometer-Sized Cables Composed of Ni Nanowires and Sub-micrometer-Sized Fullerene Tubes

机译：Ni纳米线和亚微米级富勒烯管组成的同心亚微米级电缆

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Highly ordered arrays of submicrometer-sized coaxial cables composed of submicrometer-sized C_(60) and C_(70) tubes filled with Ni nanowires are successfully prepared by combining a sol-gel method with an electrodeposition process. The wall thickness of the submicrometer-sized tubes can be adjusted by the concentration of fullerenes and the immersion time. The thermal stability of the submicrometer-sized C_(60) tubes is studied by Raman spectroscopy and it is found that these structures can be easily decomposed to form carbon nanotubes at relatively low temperatures (above 573 K) in an alumina template. These novel coaxial cable structures have been characterized by transmission electron microscopy (TEM), high-resolution TEM (HRTEM), scanning electron microscopy (SEM), field-emission SEM (FESEM), Raman spectroscopy, elemental mapping, energy dispersive X-ray (EDX) spectroscopy, X-ray diffraction (XRD), vibrating sample magnetometer (VSM) experiments, and superconducting quantum interference device (SQUID) measurements. Magnetic measurements show that these submicrometer-sized cables exhibit enhanced ferromagnetic behavior as compared to bulk nickel. Moreover, submicrometer-sized C_(70)/M cables show uni-axial magnetic anisotropy with the easy magnetic axis being parallel to the long axis of the Ni nanowires. C_(70)/Ni cables also exhibit a new magnetic transition at ca. 10 K in the magnetization-temperature (M-T) curve, which is not observed for the analogous C_(60)/Ni structures. The origin of this transition is not yet clear, but might be related to interactions between the Ni nanowires and C_(70) molecules. There is no preferred magnetization axis in submicrometer-sized C_(60)/Ni cables, which implies that the Ni nanocrystals have different packing modes in the two composites. These different crystalline packing modes lead to different magnetic anisotropy in the two composites, although the Ni nanocrystals have the same face-centered cubic (fcc) structure in both cases.
机译：通过将溶胶-凝胶法与电沉积工艺相结合，成功地制备了由亚微米尺寸的C_（60）和C_（70）管组成的，排列有序的亚微米尺寸的同轴电缆阵列。亚微米级管的壁厚可以通过富勒烯的浓度和浸没时间来调节。通过拉曼光谱法研究了亚微米级C_（60）管的热稳定性，发现在氧化铝模板中，这些结构很容易在相对较低的温度（573 K以上）下分解形成碳纳米管。这些新颖的同轴电缆结构已通过透射电子显微镜（TEM），高分辨率TEM（HRTEM），扫描电子显微镜（SEM），场发射SEM（FESEM），拉曼光谱，元素映射，能量色散X射线进行了表征（EDX）光谱，X射线衍射（XRD），振动样品磁力计（VSM）实验和超导量子干涉仪（SQUID）测量。磁性测量表明，与散装镍相比，这些亚微米级电缆表现出增强的铁磁性能。此外，亚微米尺寸的C_（70）/ M电缆表现出单轴磁各向异性，其易磁轴平行于Ni纳米线的长轴。 C_（70）/ Ni电缆在大约200℃时也表现出新的磁跃迁。在磁化温度（M-T）曲线中为10 K，对于类似的C_（60）/ Ni结构未观察到。此过渡的起源尚不清楚，但可能与Ni纳米线和C_（70）分子之间的相互作用有关。在亚微米尺寸的C_（60）/ Ni电缆中没有优选的磁化轴，这意味着Ni纳米晶体在两种复合物中具有不同的堆积模式。尽管两种情况下Ni纳米晶体具有相同的面心立方（fcc）结构，但这些不同的晶体堆积方式导致两种复合材料的磁各向异性不同。

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