High intensity, plasma-induced emission from large area ZnO nanorod array cathodes

Journal Article · Sat Nov 15 04:00:00 UTC 2008 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.3033749· OSTI ID:21259689

Qingliang, Liao; Ya, Yang; Junjie, Qi; Yue, Zhang; Yunhua, Huang; Zi, Qin ^[1]; Liansheng, Xia ^[2]

---

1. State Key Laboratory for Advanced Metals and Materials, Department of Materials Physics, University of Science and Technology Beijing, Beijing 100083 (China)
2. Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang 621900 (China)

High intensity electron emission cathodes based on a well-aligned ZnO nanorod array were fabricated. An investigation of the properties of the plasma and the electron beams produced by ZnO nanorod array cathodes was presented. Intense current electron beams were obtained from the cathodes. At an electric field of 7-8 V/{mu}m and pulse duration of {approx}100 ns, the highest emission current density reached 76-91 A/cm{sup 2}. The production mechanism of the electron beams was the plasma-induced emission. The morphology and structure of the ZnO nanorod after the application of the accelerating pulses were characterized. The plasma expanded at a velocity of about 10.7 cm/{mu}s during the pulse interval. Whether the emission currents are high or low, the plasma on the cathode surface were always distributed uniformly. The ZnO nanorod array cathodes are expected to be applied to high power vacuum electronic devices as electron beam sources.

• OSTI ID: 21259689
• Journal Information: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 11 Vol. 15; ISSN PHPAEN; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
CATHODES
CURRENT DENSITY
ELECTRON BEAMS
ELECTRON EMISSION
FIELD EMISSION
PLASMA
WALL EFFECTS
ZINC OXIDES