title: Enhanced field emission from compound emitters of carbon nanotubes and ZnO tetrapods by electron beam bombardment.
abstract: The enhancement of field emission from compound emitters of carbon nanotubes and ZnO tetrapods by the electron beam bombardment is reported. After 20 minutes electron bombardment with 6 keV energy, a few bird-nest micro structures are formed in the compound emitters array. As the simulation results shown, the electric field and field emission current density at the tip of ZnO tetrapod are increased due to the influences of these bird-nest micro structures. From the measurement of the field emission performance, it can be seen that the turn-on electric field and threshold electric field of the field emitter array decrease to 0.4 V/microm and 2.4 V/microm respectively. They have decreased 62% and 15% after the electron bombardment. After the electron bombardment, the emission sites density is increased. The field emission images show that the uniformity of field emission has been improved obviously after the proper electron bombardment. The methodology proposed in this paper has a promising application in the field emission devices.
authors.affiliation: School of Electronic Science and Engineering, Southeast University, Nanjing 210096, PR China.
authors.forename: Lei
authors.initials: L
authors.lastname: Wei
authors.forename: Xiaobing
authors.initials: X
authors.lastname: Zhang
authors.forename: Chaogang
authors.initials: C
authors.lastname: Lou
authors.forename: Zhiwei
authors.initials: Z
authors.lastname: Zhao
authors.forename: Chen
authors.initials: C
authors.lastname: Jing
authors.forename: Baoping
authors.initials: B
authors.lastname: Wang