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Effects of ammonia in catalytic chemical vapor deposition in the synthesis of carbon nanotubes

Chemical vapor deposition with xylene as the carbon resource, a nitrate iron solution as the catalyst, and ammonia gas as the reduction gas was used to investigate the different parameters that influence carbon nanotubes. Different concentrations of the ammonia gas and different substrates affect the morphology and properties of carbon nanotubes fabricated using the method involving ammonia gas and a quartz plate. This method yields a large quantity of vertically aligned carbon nanotubes with a typical bamboo-like inner layer structure. In the synthesis of this type of carbon nanotube, the ammonia etches the catalyst surface through the catalyst agglomeration.