Field emission characteristic study on bristling few-layer graphite/diamond composite film

The purpose of this study is to fabricate a composite film of bristling few-layer graphite on an octagonal shaped diamond-tip array and to measure the field emission characteristics. The composite film of bristling few-layer graphite on an octagonal shaped diamond-tip array is firstly proposed to improve the field emission effect and lifetime because of the high pitch height ratio of bristling few-layer graphite and the high stability of diamond. The microcrystalline and ultra-nano-crystalline diamond-tip arrays with the shape of an octagonal cone are formed by microwave plasma-enhanced chemical vapor deposition on a silicon substrate. Changing the flow rates of gasses when the bristling few-layer graphite are deposited on the diamond film leads to different results and find out the ideal fabrication parameters for improving field emission. The diamond-tip arrays and bristling few-layer graphite morphology are then examined by Raman spectroscopy and scanning electron microscopy. The field emission effect with different few-layer graphite/diamond composite arrays is also examined. In this study, the composite film of bristling few-layer graphite structures on diamond-tip arrays grown by N-2/H-2/CH4 = 40/80/20 showed excellent field emission stability and high field emission characteristics with low turn-on field of 2.60 V/mu m and the field enhancement factor of 1921. (C) 2016 Published by Elsevier B.V.