Zhang Lu, Chen Li, Wells Torquil, El-Gomati Mohamed
Department of Electronics, The University of York, Y010 5DD, UK.
J Nanosci Nanotechnol. 2009 Jul;9(7):4502-6. doi: 10.1166/jnn.2009.m84.
Carbon nanotubes with different structures were catalytically synthesized on Ni coated SiO2/Si substrate in a Direct Current Plasma Enhanced Chemical Vapour Deposition system, in which C2H2 acted as the carbon source and NH3 as the etchant gas. A Scanning Electron Microscope study showed that carbon nanotubes were all vertically aligned with respect to the substrate, with diameters ranging from 10 nm to 200 nm. Different sizes of Ni catalyst particles were observed on the tips of carbon nanotubes. Transmission Electron Microscopy was used to study the morphology of the grown tubes and the results obtained show that the diameters and structures of these carbon nanotubes were closely correlated to the sizes and structures of the Ni nanoparticles. Two main structures namely bamboo shaped carbon nanotubes and herringbone shaped carbon nanofibres were found on the same sample. It is suggested that by controlling the pre-growth condition, desired structure of carbon nanotubes or carbon nanofibres could be produced for practical applications.
在直流等离子体增强化学气相沉积系统中，以涂覆有镍的SiO₂/Si衬底为基础，以C₂H₂作为碳源、NH₃作为蚀刻气体，催化合成了具有不同结构的碳纳米管。扫描电子显微镜研究表明，碳纳米管均垂直于衬底排列，直径范围为10纳米至200纳米。在碳纳米管的尖端观察到不同尺寸的镍催化剂颗粒。利用透射电子显微镜研究了生长管的形态，结果表明这些碳纳米管的直径和结构与镍纳米颗粒的尺寸和结构密切相关。在同一样品上发现了两种主要结构，即竹节状碳纳米管和人字形碳纳米纤维。研究表明，通过控制生长前的条件，可以制备出具有所需结构的碳纳米管或碳纳米纤维，以用于实际应用。
