▎ 摘　　要

NOVELTY - Preparation of carbon nanochains involves: 1) subjecting a feedstock/catalyst mixture comprising a carbon-containing feedstock and a catalyst, to pyrolysis to form a feedstock/catalyst-containing char; 2) subjecting the char to irradiation with a laser, in the presence of the catalyst to form carbon nanochains. The carbon-containing feedstock is a biomass and/or carbonaceous material. The catalyst is a transition metal salt, elemental metal and/or alloy. USE - The method is used for preparing carbon nanochains used in elecrnic devices such as electron field emitters, light sources, lithium secondary batteries, hydrogen storage cells, transistors and cathode ray tubes (CRTs). ADVANTAGE - The high purity carbon nanochains or carbon nanotubes prepared are very small tube-shaped structures essentially having a composition of single graphene sheet or layers of graphene sheets in a tubular form. The nanotubes have improved electrical and mechanical properties, extremely high electrical conductivity, very small diameters (much less than 100 nanometers), large aspect ratios (greater than 1000) and tip-surface area near the theoretical limit (smaller the tip-surface area, the more concentrated is the electric field, and greater is the field enhancement factor). DESCRIPTION OF DRAWING(S) - The drawing shows powder x-ray diffractograms of carbon nanostructures prepared.