Very long carbon nanotubes

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Abstract

Carbon nanotubes1 can now be produced in large quantities by either arc methods2,3 or thermal decomposition of hydrocarbons4,5. Here we report that pyrolysis of acetylene over iron/silica substrates is an effective method with which to produce very long, multiwalled carbon nanotubes that reach about 2 mm in length, which is an order of magnitude longer than that described in most previous reports1,2,3,4,5,.

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Figure 1: Low-magnification scanning electron microscope images of aligned carbon nanotube arrays.
Figure 2: Scanning and transmission electron microscope images of nanotubes after 48 hours of growth.

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