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Table 1 Comparative field emission characteristics of sample A, sample B, sample C and sample D coated over carbon paper

From: Effect of Purity and Substrate on Field Emission Properties of Multi-walled Carbon Nanotubes

Sample βL βH Turn-on (10 μA/cm2) field(V/μm) Threshold field at 0.2 mA/cm2(V/μm)
A 548 3,995 3.51 4.38
B 322 6,066 4.01 4.94
C 1,389 15,881 2.3 2.85
D 1,199 12,266 2.59 3.15