D S Tang et al 2002 Nanotechnology 13 L1 doi:10.1088/0957-4484/13/4/101
D S Tang, S S Xie, B H Chang, L F Sun, Z Q Liu, X P Zou, Y B Li, L J Ci, W Liu, W Y Zhou and G Wang
Show affiliationsWe have investigated the changes in the morphology and microstructure of carbon nanotubes (CNTs) brought about by acetylene in the buffer gas of helium in arc discharge. Observations using scanning electron microscopy and transmission electron microscopy indicate that, with the introduction of acetylene, on the one hand, the diameters of spots in the central pattern region decrease markedly and CNTs are embellished with nanoparticles on the top surface of cathode deposit; and, on the other hand, the outer and inner diameters of CNTs decrease evidently. These results indicate that the outer diameter and innermost empty space of the nanotubes are related to growth conditions such as the density of carbon species and temperature in the growth region. This suggests that the outer and inner diameters of CNTs are adjustable by controlling the growth conditions in the growth region.
52.80.Mg Arcs; sparks; lightning; atmospheric electricity
68.37.Hk Scanning electron microscopy (SEM) (including EBIC)
Issue 4 (August 2002)
Received 11 January 2002, in final form 29 May 2002
Published 21 June 2002
D S Tang et al 2002 Nanotechnology 13 L1
A V Dvurechenskii et al 2002 Nanotechnology 13 75
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