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采用高温热解法 ,以乙二胺为前驱液 ,在沉积有铁催化剂的p型硅 (1 1 1 )基底上制备出了定向生长的CNx 纳米管 .利用扫描电子显微镜、高分辨率透射电子显微镜和拉曼光谱对CNx 纳米管进行了形貌观察和表征 .CNx 纳米管的高度在 2 0 μm左右 ,直径在 5 0— 1 0 0nm之间 ,具有明显的“竹节状”结构 ,结晶有序度较差 .对CNx 纳米管薄膜进行低场致发射性能测试 :外加电场为 1 4V μm ,观察到 2 0 μA cm2 发射电流 ,外电场升至 2 5 4V μm时发射电流达到1 2 80mA cm2 ,在较高外电场下 ,没有发现电流“饱和” .这比相同实验条件下改变前驱液制备出的碳纳米管和硼碳氮纳米管的场发射性能优越 .还在“竹节状”结构的基础上对CNx 纳米管的场致电子发射机理进行了讨论
Directionally grown CNx nanotubes were prepared on a p-type Si (11-1) substrate deposited with an iron catalyst using ethylenediamine as precursor solution by high temperature pyrolysis method.Using scanning electron microscopy, high resolution transmission electron Microscopy and Raman spectroscopy were used to observe and characterize the morphology of CNx nanotubes.CNCN nanotubes have a height of 20 μm and a diameter of 50-100 nm with obvious “bamboo-like” structure and crystallization CNx nanotube thin films were tested for low field emission performance with an applied electric field of 14V μm and an emission current of 20 μA cm2 were observed.The emission current of the CNx nanotubes reached 1 2 80mA cm2, no current “saturation” was found under the higher external electric field, which is superior to that of carbon nanotubes and boron carbonitride nanotubes prepared by changing the precursor solution under the same experimental conditions. The field-induced electron emission mechanism of CNx nanotubes is discussed based on the structure