Abstract
The electric field is affected by the arrangement of the vertically aligned carbon nanotube (VACNT) columns in field emission devices. We fabricated VACNT column array for use in micro time-of- flight mass spectrometer (TOF MS) and investigated the influence of the VACNT column array on the characteristics of field emission. According to the electric field distribution simulation based on FEMLAB, the field screening effect depends on the CNT arrangement and the pitch-to-height ratio. The different types of VACNT column array cathodes were fabricated and tested for field emission. All these VACNT column array cathodes showed excellent field emission properties and a trend consistent with electric field distribution simulation.
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