SHORT CARBON NANOTUBES Russian patent published in 2007 - IPC C01B31/02 B01J19/08 B01J20/20 B01J21/18 B82B3/00 

FIELD: electronic industry, possible use for manufacturing hydrocarbon storage materials.

SUBSTANCE: short multi-wall carbon nanotubes are composed of concentrically positioned layers of nanotubes with average diameter ranging from 2 to 15 nanometers, median diameter ranging from 6 to 8 nanometers and natural length ranging from 100 to 500 nanometers. Nanotubes may comprise 2-15 coaxial layers of one-walled nanotubes. Each short multi-wall carbon nanotube has one semi-spherical end and on conical end, where semi-spherical end may be selectively opened by oxidizing, leaving conical end untouched. Short multi-wall carbon nanotubes in accordance to invention in form of powder sample are fit for field emission of electrons, starting at approximately 2 V/micrometer.

EFFECT: resulting short multi-wall carbon nanotubes are more homogeneous length and diameter-wise and have improved emission properties compared to known ones.

5 cl, 6 dwg, 2 ex