FIELD: vacuum engineering; production of carbon nano-tubes from graphite paper used as auto-electronic emission sources.
SUBSTANCE: proposed method consists in modification of graphite paper coated with silica gel applied by means of current firing. First silica gel is applied on graphite paper surface. Silica gel contains nitrates of metals used as catalyst, mainly Fe, Co, Ni or their alloys. Then, paper is placed in vacuum plant and pressure of (1-5)·10-5 is built up. Such limit ensures minimum residual atmosphere of inert gas. Then, graphite paper is subjected to modification by current firing. Carbon nano-tubes are formed at temperature of 650-750°C. Proposed method is effective in production of nano-tubes with insignificant defects at diameter ranging from 10 to 100 nm.
EFFECT: facilitated procedure and low cost.
4 dwg
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