利用电泳法在镀镍的聚酰亚胺薄膜上制备了非晶碳包覆碳纳米管复合结构柔性冷阴极。利用扫描电镜观察了结构形貌。并对其场发射性能进行了研究。结果显示,该复合结构柔性冷阴极具有较低的开启电场和较高的发射电流密度。

利用微波等离子体化学气相沉积方法,以甲烷、氢混合气体为反应气体,具有钛镀层的玻璃作为衬底,制备了具有sp1杂化结构的白碳纳米晶薄膜。利用X射线衍射、俄歇电子能谱,以及扫描电子显微镜对薄膜结构进行了表征。以白碳纳米晶薄膜为阴极,以镀有ITO透明导电薄膜玻璃为阳极,采用二极管结构,测试了白碳纳米晶薄膜的场致电子发射特性。开启电场为2.5 V/μm,在电场为5 V/μm时的电流密度为200μA/cm2。对白碳纳米晶薄膜生长机理,以及其场致电子发射机制进行了讨论。

White carbon films were synthesized by microwave plasma chemical vapor deposition. Irregular flakiness microstructure consisting of nanocrystalline grains of the as-grown film was observed by scanning electron microscope. The films have a metallic gray to white color, with reflectivity of 12.56%-21.58% in the visible region. The diffraction line at 20=21.6° (d=0.4107 nm), shown in x-ray diffraction spectrum of the film, corresponds to the (110) facet of β modifications of white carbon. The peak position at 283.46 eV in the x-ray photoelectron spectrum represents binding energy of C_1s core level of sp¹ hybridization of carbon. Field electron emission characteristics of the film were tested. A turn-on field of 3.5 V/μm was obtained. © 2007 American Vacuum Society.