▎ 摘　　要

NOVELTY - Method of improving field emission performance of graphene sheet-carbon nanotube array composite material involves bombarding pre-processed silicon single wafer with energy-carrying silver ions, preparing carbon nanotube array by thermal chemical vapor deposition, subjecting to high-temperature annealing treatmen, preparing thin layer graphene sheets by microwave plasma enhanced chemical vapor deposition, carrying out hydrogen plasma treatment of graphene sheet-carbon nanotube array using microwave nitrogen at room temperature in the microwave power of 100-140 W and chamber pressure of 1.5 kPa, for 0.5-2 hours, and obtaining nitrogen-doped graphene sheet-carbon nanotube array composite material. USE - Method of improving field emission performance of graphene sheet-carbon nanotube array composite material. ADVANTAGE - The method efficiently provides field emission performance-improved graphene sheet-carbon nanotube array composite material having low operating electric field and excellent field emission stability under high-current density. DETAILED DESCRIPTION - The nitrogen-doped graphene sheet-carbon nanotube array composite material is composed of graphene sheet having a number of edge layers of 1-5 layers, rich in defects, and nitrogen doping on the carbon nanotube array. The threshold field average of prepared nitrogen-doped graphene sheet-carbon nanotube array composite is 1.09-1.21 V/ mu m. The maximum field emission current density of the composite is 101.79-120.56 mA/cm2. The average field emission current density of the composite is as high as 45.46 mA/cm2. The current decay of the composite in 20 hours is 3.86%.