Synthesis of Nitrogen-Doped Carbon Nanotubes Using Injection-Vertical Chemical Vapor Deposition: Effects of Synthesis Parameters on the Nitrogen Content

Table 2

Major nitrogen functional groups identified in the N-CNTs grown with the low and high catalyst loadings.

Sample/N content (%)	N-Pyridinic; (397–398.6 eV)	N-Pyrrolic; (399.7 eV)	N-Quaternary; (401 eV)	N-Pyridinic oxides; (402–405 eV)
Low catalyst loading (5 mg/mL)	31	5	37	28
High catalyst loading (15 mg/mL)	48	7	31	15