Journal of the Korean Physical Society

Korean Physical Society (한국물리학회)
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Dependence of Field Emission of ZnO Nanowire on Vacuum Pressure

Kim, Do-Hyung;Lee, Hyeong-Rag

  • Published : 2004.10.15
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Abstract

The influence of vacuum pressure (VP) on the field emission (FE) properties of ZnO nanowires (ZNWs) were investigated by using {it in-situ} measurements of the emission current and the VP. The FE of ZNWs showed a stable and rapid response to variations in the high-vacuum pressure range from ${\sim}\;10^{-6}\;to\;10^{-3}$ Torr at room temperature, showing a straight line plot of log(I) versus log(1/p). From Fowler-Nordheim plots obtained from the current-voltage curves for various values of the VP, a systematic change in the work function was confirmed. The FE dependence on the VP could be attributed to a scalable change in the work function induced by adsorbed molecules and by oxygen vacancies. The ZNWs could represent an alternative mechanism for fingerprinting a variable VP.

Keywords

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