期刊
JOURNAL OF APPLIED PHYSICS
卷 108, 期 12, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.3512904
关键词
-
资金
- United Technologies Research Center
- UConn New Faculty
- Department of Energy [DE-EE0000210, DEFC2609FE0000870]
The effects of gas adsorption and high current on the field emission characteristics of ZnO nanoneedles grown directly from metal electrodes have been systematically investigated. Exposure of nanoneedles to H-2, N-2, or O-2 gas degraded the field emission characteristics, with O-2 having the strongest impact. Complete recovery of emission current following H-2 and N-2 treatment was accomplished by vacuum annealing at 450 degrees C. Meanwhile, changes induced by O-2 adsorption were irreversible. First-principle calculations revealed electronic structure modifications through change of work function and charge density distribution upon gas exposure. It is suggested that the emission current degradation originates from shifts in the Fermi level caused by charge transfer from nanoneedle surface to gas adsorbates. Moreover, field emission degradation has been observed at high currents as a result of surface melting at the nanoneedles apex caused by resistive heating. (C) 2010 American Institute of Physics. [doi:10.1063/1.3512904]
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据