Hwang E J, Lee S K, Jeong M G, Lee Y B, Lim D S
Department of Materials Science and Engineering, Korea University, Anam-Dong 5-1, Seoungbuk-Ku, Seoul 136-713, Korea.
J Nanosci Nanotechnol. 2012 Jul;12(7):5875-9. doi: 10.1166/jnn.2012.6294.
Carbon nanotubes (CNTs) have unique atomic structure and properties, such as a high aspect ratio and high mechanical, electrical and thermal properties. On the other hand, the agglomeration and entanglement of CNTs restrict their applications. Sea urchin-like multiwalled carbon nanotubes, which have a small aspect ratio, can minimize the problem of dispersion. The high hardness, thermal conductivity and chemical inertness of the nano-diamond powder make it suitable for a wide range of applications in the mechanical and electronic fields. CNTs were synthesized on nano-diamond powder by thermal CVD to fabricate a filler with suitable mechanical properties and chemical stability. This paper reports the growth of CNTs with a sea urchin-like structure on the surface of the nano-diamond powder. Nano-diamond powders were dispersed in an attritional milling system using zirconia beads in ethanol. After the milling process, 3-aminopropyltrimethoxysilane (APS) was added as a linker. Silanization was performed between the nano-diamond particles and the metal catalyst. Iron chloride was used as a catalyst for the fabrication of the CNTs. After drying, catalyst-attached nano-diamond powders could be achieved. The growth of the carbon nanotubes was carried out by CVD. The CNT morphology was examined by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The mean diameter and length of the CNTs were 201 nm and 3.25 microm, respectively.
碳纳米管（CNTs）具有独特的原子结构和性能，例如高长径比以及高机械性能、电学性能和热性能。另一方面，碳纳米管的团聚和缠结限制了它们的应用。具有小长径比的海胆状多壁碳纳米管能够将分散问题降至最低。纳米金刚石粉末的高硬度、热导率和化学惰性使其适用于机械和电子领域的广泛应用。通过热化学气相沉积法在纳米金刚石粉末上合成碳纳米管，以制备具有合适机械性能和化学稳定性的填料。本文报道了在纳米金刚石粉末表面生长具有海胆状结构的碳纳米管。纳米金刚石粉末在含有氧化锆珠的乙醇研磨系统中进行分散。研磨过程之后，添加3-氨丙基三甲氧基硅烷（APS）作为连接剂。在纳米金刚石颗粒和金属催化剂之间进行硅烷化处理。使用氯化铁作为制备碳纳米管的催化剂。干燥之后，可得到附着有催化剂的纳米金刚石粉末。通过化学气相沉积法进行碳纳米管的生长。通过扫描电子显微镜（SEM）和透射电子显微镜（TEM）对碳纳米管的形态进行检测。碳纳米管的平均直径和长度分别为201纳米和3.25微米。
