Fig. 5
a Field emission behaviors of CNTs on patterned substrates grown at different H2/C2H2 mixture ratio. b Maximum current density test of the CNTs grown with H2/C2H2 = 140/5 sccm. c The F-N plots. d The typical curves of the current density (J) varied with the testing time. e The J-E curves of the CNT carried out with increased and decreased voltages of different loops. f Long-term stability curves of CNT emitters grown H2/C2H2 = 140/5 sccm