Micrometre-length continuous single-crystalline nm-thin Fe3C-nanowires with unusual 010 preferred orientation inside radial few-wall carbon nanotube structures: the key role of sulfur in viscous boundary layer CVS of ferrocene
Micrometre-length continuous single-crystalline nm-thin Fe3C-nanowires with unusual 010 preferred orientation inside radial few-wall carbon nanotube structures: the key role of sulfur in viscous boundary layer CVS of ferrocene
复制标题
DOI：
10.1039/c7ra00240h
复制
发表时间：
2017-01-01
期刊：
影响因子：
3.9
通讯作者：
Xiang, Gang
中科院分区：
文献类型：
--
作者：
Boi, Filippo S.;Wang, Jiayu;Xiang, Gang
制造填充铁磁纳米线的碳纳米管的一个关键挑战是控制纳米管壁的数量以及纳米线的连续性、成分和结晶度。我们偶然观察到了新型径向碳纳米管结构，该结构具有很少的壁（2-5 壁），填充有纳米薄和许多微米长的连续单晶 Fe3C 纳米线。这些是化学气相合成实验中的主要反应产物，涉及粗糙表面和层流氩流之间的粘性边界层中二茂铁/硫混合物的热解。这些纳米线沿着纳米管毛细管具有不寻常的优选 010 取向。这些结构的特性通过使用多种技术进行研究：SEM、TEM、HRTEM、EDX、STEM、XRD、拉曼光谱、FT-IR 光谱和 VSM。
A key challenge in the fabrication of carbon nanotubes filled with ferromagnetic nanowires is the control of the number of nanotube-walls together with the nanowire continuity, composition and crystallinity. We report the serendipitous observation of novel radial carbon nanotube structures with few walls (2-5 walls) filled with nm-thin and many-micrometres long continuous single-crystalline Fe3C nanowires. These are the dominant reaction products in chemical vapour synthesis experiments involving the pyrolysis of ferrocene/sulfur mixtures in the viscous boundary layer between a rough surface and a laminar Ar flow. These nanowires are found with an unusual preferred 010 orientation along the nanotube capillary. The properties of these structures are investigated through the use of multiple techniques: SEM, TEM, HRTEM, EDX, STEM, XRD, Raman spectroscopy, FT-IR spectroscopy and VSM.