高能球磨对碳纳米管形貌及场致发射显示特性的影响

用化学气相沉积法制备了碳纳米管，进行了不同时间的球磨处理。用扫描电镜、拉曼光谱对其形貌和结构进行了表征。对不同球磨条件下的碳纳米管制备成阴极，进行了场致发射特性的测试。结果表明，高能球磨会对碳纳米管的形貌、结构及场致发射性能有明显的影响。球磨时间为0．5～1h时，可以使碳纳半管变短而均匀，且场致发射电性能与未处理时相近，即有低的阈值电场和高的发射电流密度，从而使发射时在阳极上产生的荧光点密度大大增加，发光均匀。但研磨时间过长会改变碳纳半管结构，使其非晶化或石墨化，导致其场致发射性能和显示效果变差。

Effects on the Morphology and Field Emission Properties of Carbon Nanotubes Treated by High-Energy Ball Milling

Multi-walled carbon nanotubes (CNTs) deposited by chemical vapor deposition (CVD) were treated by ball-milling with different time, the morphology and structure of which were explored with scanning electron microscope and Raman spectra. The field emission properties of the cathode made of CNTs under different ball-milling conditions were tesed. The results showed that, high-energy ball milling brought obvious effects on the morphology, structure and field emission property of the CNTs. A ball-milling time of 0.5～1.0 h resulted in a more even and uniform surface of the CNTs, enhanced the field emission properties, and also greatly increased uniform luminescent spots on the anode. The field emission properties can be degraded if the milling time is too long (>1 h), due to the resulting amorphism and graphitization of CNTs.