Highly conductive carbon nanotube having bundle moieties with ultra-low bulk density and its manufacturing method

摘要

PURPOSE: Ultra-low density bundle structured-type carbon nanotubes, a manufacturing method thereof and a usage thereof provided here can enhance electrical conductive property to the utmost limit and can remarkably reduce the solid content of the carbon nanotubes in a coating solution due to the high dispersibility, when a solution-type high conductive coating solution is provided, resulting in economic advantages. CONSTITUTION: A manufacturing method of ultra-low density bundle structured-type carbon nanotubes comprises the steps of: adding and dissolving 0.1-2 parts by weight of polymers with low molecular weight based on 100 parts by weight of metal catalyst particles, indicated as [Fe,Co,Ni]p[AlaMgbMnc]q, in water to produce a dispersed and pyrolyzed catalyst composition; and injecting carbon sources into the catalyst composition to synthesize carbon nanotubes at 600-800°C through the chemical vapor deposition method. In the flowing chemical formula, p+q=1, 0.3=p=0.8, 0.2=q=0.7; a, b, and c exhibit the molar fraction of Al, Mg and Mn; and a+b+c=1, 0.1=a=0.8, 0.1=b=0.9, 0.01=c=0.2. The apparent density of the metal catalyst particle is 0.03-0.90 g/cc. The apparent density of the bundled carbon nanotube is 0.003-0.010 g/cc.