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Carbon-Based Nanocomposite Materials For Cold Cathode Sources

Published online by Cambridge University Press:  01 February 2011

Alexander V. Karabutov,
Viktor G. Ralchenko and
Sergey K. Gordeev
Alexander V. Karabutov
Affiliation:
General Physics Institute, Vavilova str. 38, Moscow 119991, Russia (e-mail: lx@ran.gpi.ru)
Viktor G. Ralchenko
Affiliation:
General Physics Institute, Vavilova str. 38, Moscow 119991, Russia (e-mail: lx@ran.gpi.ru)
Sergey K. Gordeev
Affiliation:
Central Research Institute of Materials, Paradnaya str. 8, St-Petersburg 191014, Russia
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Abstract

To find an alternative for CVD diamond films and carbon nanotubes for low-field electron emission sources and cold cathode applications, we have designed a novel class of nanomaterials with excellent field emission properties – dielectric/carbon nanocomposites, in which different insulating nanoparticles such as silicon oxide, boron nitride in cubic and hexagonal forms, and nanodiamond were used inside a pyrocarbon matrix. The thickness of pyrocarbon shells covering the dielectric particles can be controlled in a wide range during the CVD process. The best samples of the nanocomposites with all four kinds of dielectric material show excellent field emission properties with threshold fields of as low as 0.5–1 V/μm, good surface uniformity and long-term stability. An effect of post-growth treatment with oxygen and hydrogen plasma on the emission was also studied. A mechanism of the emission is discussed basing on quantum properties of nanostructured thin (two-dimensional) carbon covering the dielectric particles. The mechanism could be suitable for wide range of nanostructured sp2-bonded carbon objects.

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References

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