Dependence of field emission of ZnO nanowire on vacuum pressure

作者：Kim DH^*; Lee HR

来源：Journal of the Korean Physical Society, 2004, 45(4): L803-L806.

• ZnO nanowire
• field emission
• vacuum sensor
• work function

The influence of vacuum pressure (VP) on the field emission (FE) properties of ZnO nanowires (ZNWs) were investigated by using 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 similar to 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.

• 出版日期2004-10