The Field emission (FE) current strongly depends on the work function and geometry of the emitting materials. The high-FE current from carbon nanotubes is thought to be due to the sharpness of the nanotube that can enhance external electric field. To apply a high quality field emission device (for example FED), the electron emitters must be stable and have a long life time. Our activity in the study of FE properties of wide band gap material was initiated by demonstration of favorable emission properties of diamond on metal tip [1]. In this work, we study the FE property of wide band gap material (WBGM)- coated carbon nanotubes. We also investigate the secondary electron behavior of MgO- and MgO/CsI-coated nanotubes.
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