ANNEALING TEMPERATURE EFFECT ON THE FIELD EMISSION PROPERTIES OF CARBON NANOTUBE FILMS
L. L. WANG
Y. W. CHEN
P. S. GUO
W. X. QUE
As the carbon nanotubes (CNTs) films are applied to the field emission cathodes in the vacuum devices, heat treatment in the range of 400Â°Câ500Â°C is often conducted during the device sealing process, especially for glass-based devices. The annealing temperature effect on the field emission of the CNT films prepared by chemical vapor deposition is investigated. The CNT film annealed at 400Â°C in air contains less amorphous carbon phase, and shows better field emission properties comparing to the as-grown CNT film. Annealing at 450Â°C causes serious oxidative damage along the tube walls, resulting in the poor field emission performance. The CNTs annealed at 500Â°C are all burned out. The experiment shows that the sealing temperature at 400Â°C or below can be conducted in air, while the sealing temperature above 400Â°C should be done in N2 or Ar ambient.
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