Tailored Field-Emission Property of Patterned Carbon Nitride Nanotubes by a Selective Doping of Substitutional N(sN) and Pyridine-like N(pN) Atoms

It is determined by first-principle calculations and experiments that the threshold field to achieve 1 mA/cm2 emission current density is reduced from 4.8 to 2.3 V/μm by changing pyridine-like nitrogen doping into substitutional nitrogen doping in carbon nanotubes.