Method for gas phase purification of carbon nanotubes by thermal treatment in diffusion furnace

摘要

PURPOSE: A method for purifying carbon nanotubes is provided which simply and effectively removes various kinds of impurities from the carbon nanotubes in a short time. CONSTITUTION: The carbon nanotubes are purified by heat-treating the carbon nanotubes in a diffusing furnace having a heat-treating tube such as a quartz tube with using heat-decomposed acid gas such as hydrochloric acid gas or nitric acid gas at a temperature of 500-1,000 deg.C for 10-30 minutes. The acid gas could be supplied to the tube with diluent gas of hydrogen gas.