Method for purifying carbon nanotubes

摘要

A method for purifying carbon nanotubes (CNTs) includes heating the CNTs including metallic impurities and metallic oxide impurities; reducing the metallic oxide impurities by passing a reducing gas through the CNTs; removing the metallic impurities and the reduced metallic oxide impurities by passing a liquid halide through the CNTs using a carrier gas; and cooling the CNTs. Therefore, by simply passing liquid chloroform through CNTs using a carrier gas, a method for purifying CNTs can be provided so as to simply, economically, and effectively remove metallic impurities from the CNTs in a short time through one step. In addition, the purification effect can be further improved by removing the metallic oxide impurities as well as the metallic impurities through the reducing step. In addition, it is possible to improve the purification effect by further performing a step of removing a halogen or an acid-treatment purification step.

主权项

1. A method of treating carbon nanotubes (CNTs) for removing impurities, the method comprising:
heating CNTs including metallic impurities; passing a halide-containing gas through the CNTs to halogenate at least part of the metallic impurities; and subsequently, etching surfaces of the CNTs to remove at least part of halogen remaining on the surfaces of the CNTs.