carbon nanotube synthesis method high-pressure carbon monoxide method https://orcid.org/0000-0001-5985-7429 CHMO:0002321 HiPCO HiPco 2009-08-28T06:39:43Z A synthesis method for carbon nanotubes that involves mixing high pressure (e.g. 30 atmospheres) CO that has been preheated (1000 °C) and a catalyst precursor gas (metal carbonyl or metallocene). Under these conditions the precursor decomposes forming metal particle clusters on which carbon nanotubes nucleate and grow. The carbon nanotubes are 99% single-walled carbon nanotubes with small diameters (e.g., (5,5) tubes). high-pressure CO conversion HiPco method HiPCO method