Abstract
Layers (~ 1 μm thick) of crooked carbon nanotubes 20–60 nm in diameter were obtained at 800 °C by pyrolysis of polyethylene in He atmosphere using a Ni plate as a catalytic substrate. They were identified by electron microscopy and electron diffraction. Tips of some tubes (~ 10 6/cm 2) come out of the layer. We studied their field electron emission at 10 −9 torr vacuum. 1–10 mA/cm 2 current density was observed at 4–10 V/μm ( V ~ 100–250 V).
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