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研究了钛基金属掺混纳米金刚石的场发射特性。以钛和铪分别和纳米金刚石掺混,采用电泳法制得了阴极样品,并使用SEM和XRD对阴极样品的结构和形貌进行表征,最后进行场发射特性的测试。结果发现,掺入5 mg的钛样品的形貌更加均匀和致密,而掺入铪样品的形貌变差。同时,与未掺杂样品相比较而言,掺钛样品的场发射特性有了提高,而掺铪样品的场发射特性有所下降。掺钛样品之间的比较发现,钛掺入量不宜过多,适量的钛掺入能使得纳米金刚石阴极的场发射性能得到提高。分析表明,这是由金属钛和铪的性质决定的,影响了金刚石与基底Ti的键合反应,从而影响了掺杂纳米金刚石的场发射性能。
The field emission characteristics of titanium-based metal-doped nano-diamond were investigated. Titanium and hafnium were mixed with nano-diamond respectively. Cathode samples were prepared by electrophoresis. The structure and morphology of cathode samples were characterized by SEM and XRD. Finally, the field emission characteristics were tested. The results showed that the morphology of titanium samples doped with 5 mg was more uniform and dense, while the morphology of samples doped with hafnium decreased. At the same time, compared with the undoped samples, the field emission characteristics of titanium-doped samples are improved, while the field emission characteristics of hafnium-doped samples are decreased. The comparison between Ti-doped samples shows that the amount of titanium incorporated should not be too much, and the appropriate amount of titanium doped can improve the field emission performance of the nanocrystalline diamond cathode. The analysis shows that this is determined by the properties of titanium and hafnium and affects the bonding reaction between diamond and substrate Ti, which affects the field emission performance of doped nano-diamond.