Figure 4
From: Effect of Purity and Substrate on Field Emission Properties of Multi-walled Carbon Nanotubes
(a) Field emission characteristics of as-grown MWNT spin coated over carbon paper with and without graphitic layer (sample A and sample B) and that of purified MWNT spin coated over carbon paper with and without graphitic layer (sample C and sample D), (b) Fowler–Nordheim plots of as-grown MWNT spin coated over carbon paper with and without graphitic layer (sample A and sample B) and that of purified MWNT spin coated over carbon paper with and without graphitic layer (sample C and sample D)