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通过高频超声波焊接来改善电泳后碳纳米管阴极的场发射性能,深入探讨了焊接振幅对碳纳米管焊接效果以及场发射性能的影响。结果表明,焊接振幅太小,碳纳米管无法与金属紧密接触;焊接振幅过大,在高超声能和剪切力的作用下碳纳米管阴极被破坏,场发射性能明显降低。选择20%~50%的焊接振幅,可有效焊接碳纳米管与基底,使两者之间形成可靠接触。开启电压随着振幅的加大而显著降低,从而构造出稳定的场发射阴极。
The field emission properties of the carbon nanotubes cathode after electrophoresis were improved by high frequency ultrasonic welding, and the effect of welding amplitude on the welding performance and field emission properties of carbon nanotubes was discussed. The results show that the welding amplitude is too small and the carbon nanotubes can not be in close contact with the metal. The welding amplitude is too large, the cathode of the carbon nanotube is destroyed under high ultrasonic energy and shear stress, and the field emission performance is obviously reduced. Select 20% ~ 50% of the welding amplitude, which can effectively weld the carbon nanotubes and the substrate, making a reliable contact between the two. The turn-on voltage decreases significantly with increasing amplitude, resulting in a stable field emission cathode.