Tyagi Pawan K, Misra Abha, Singh Manoj K, Titus E, Misra D S, Ghatak Jay, Satyam P V, Roy Mainak
Indian Institute of Technology Bombay, Mumbai-400076, India.
J Nanosci Nanotechnol. 2005 Apr;5(4):596-600. doi: 10.1166/jnn.2005.070.
Nickel nanorods with diameters ranging from 5 to 10 nm, encapsulated inside the carbon nanotubes, are prepared using microwave plasma chemical vapor deposition. High-resolution transmission electron microscopy (HRTEM) studies reveal the perfect crystalline nature of the rods with d-spacing closely matching the (111) interplanar spacing of Ni. The (111) planes of the Ni nanorods are always aligned at 39.6 degrees with respect to the graphite planes of the nanotubes. The cosine component of the d-spacing along the direction of the graphite planes is found to be 1.6 A; exactly half the d-spacing between the graphite planes. The electron diffraction pattern shows clear spots corresponding to Ni structure. The field cooled and zero field cooled magnetization data reveal the reversibility of the magnetization of the Ni nanorods and show a blocking temperature of 195 K, which correspond to energy barrier of 0.4 eV/(V).
采用微波等离子体化学气相沉积法制备了直径为5至10纳米、包裹在碳纳米管内部的镍纳米棒。高分辨率透射电子显微镜（HRTEM）研究表明，这些棒具有完美的晶体性质，其晶面间距与镍的（111）晶面间距紧密匹配。镍纳米棒的（111）平面相对于纳米管的石墨平面始终以39.6度排列。发现沿石墨平面方向的晶面间距的余弦分量为1.6埃，恰好是石墨平面之间晶面间距的一半。电子衍射图案显示出对应于镍结构的清晰斑点。场冷和零场冷磁化数据揭示了镍纳米棒磁化的可逆性，并显示出195 K的阻塞温度，这对应于0.4 eV/（V）的能垒。
