超声波焊接振幅对碳纳米管场发射阴极性能的影响  

Influence of amplitude of ultrasonic welding on the performance of carbon nanotubes field emission cathode

作　　者：刘璇[1] 吴莹[1] 王亚荣[1] 吴燕祥[1] 张亚非[2] 

机构地区：[1]上海海洋大学工程学院,上海201306 [2]上海交通大学微纳科学技术研究院,上海200240

出　　处：《化工新型材料》2015年第6期155-157,共3页New Chemical Materials

基　　金：国家自然科学基金(51005145);上海市教委创新项目(12ZZ163);国家教育部重点项目(212056)

摘　　要：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。A high frequency ultrasonic welding was used to improve the performance of carbon nanotubes field emission cathode deposited by electrophoretic deposition.The effect of amplitude on the carbon nanotube ultrasonic welding and field emission characteristics were investigated.The results showed that carbon nanotubes could not be bonded to metal electrodes completely at low amplitude.While at high amplitude,carbon nanotubes were destructed due to the higher ultrasonic energy and shear force,and the performance of cathode was reduced evidently.Our work also revealed that at the amplitudes of 30%~50%,carbon nanotubes were welded firmly with metal to form a reliable contact.With the increase of amplitude,turn-on voltage decreased significantly and a stable field emission cathode was fabricated.

关 键 词：碳纳米管 超声波焊接 振幅 场发射 

分 类 号：TQ127.11[化学工程—无机化工] TB383.1[一般工业技术—材料科学与工程]