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超声纳米焊接技术被用来改善单壁碳纳米管(SWNTs)的场发射性能.利用电泳沉积的方法将SWNTs沉积在镍衬底上形成SWNT薄膜.将沉积有SWNT薄膜的样品进行超声纳米焊接.在高频超声能量和压紧力的共同作用下,金属镍首先发生软化,使得SWNTs很容易埋入镍中,从而两者形成了可靠的连接.扫描电子显微镜形貌图展示了SWNTs被嵌入了镍金属层中.作为稳定的发射极,焊接后的样品展现出了更加优异的场发射性能:较低的开启电压、较高的发射电流密度和更加稳定的发射电流.这主要是因为焊头表面的小突起更有利于SWNTs的端部翘起,小的接触电阻有助于电子发射的结果.大面积纳米焊接技术的使用可提高纳米焊接效率,加速大规模制备SWNT场致发射阴极.
Ultrasonic nano-welding technology was used to improve the field emission properties of single-walled carbon nanotubes (SWNTs). SWNTs were deposited on the nickel substrate by electrophoretic deposition to form SWNT films. The samples with SWNT films deposited were subjected to ultrasonic nano-welding. Under the combined action of high-frequency ultrasonic energy and compressive force, the metal nickel softens first, making the SWNTs easy to be buried in nickel, thus forming a reliable connection between the two. The SEM image shows that the SWNTs are embedded Nickel metal layer as a stable emitter, the samples after welding showed more excellent field emission performance: lower turn-on voltage, higher emission current density and more stable emission current.This is mainly due to the welding head Small protrusions on the surface are more conducive to the end of the SWNTs tilt, the small contact resistance contribute to the results of electron emission. The use of large-area nano-welding technology can improve the nano-welding efficiency and accelerate the large-scale preparation of SWNT field emission cathode.