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以二甲苯/吡啶为碳/氮源,二茂铁为催化剂,在800℃下,由化学气相沉积法(CVD)制得了直径为10～30 nm的掺氮碳纳米管(CNT)阵列。用扫描电镜、透射电镜和拉曼光谱对其形貌和结构进行了表征。发现该碳管阵列具有竹节状结构,其中的氮含量沿碳管管径方向呈渐变趋势。随着碳管中氮含量的增加,竹节长度减小。研究了阵列的场发射性能,结果表明该碳管阵列是一种优秀的场发射材料:开启场强为0.37 V/μm,阈值场强为0.9 V/μm,场增强因子为37700。
A CNT-doped carbon nanotube (CNT) array with diameter of 10-30 nm was prepared by chemical vapor deposition (CVD) at 800 ℃ with xylene / pyridine as carbon / nitrogen source and ferrocene as catalyst. Its morphology and structure were characterized by scanning electron microscopy, transmission electron microscopy and Raman spectroscopy. It was found that the carbon nanotube array has a bamboo-like structure, in which the nitrogen content gradually changes along the diameter of the carbon nanotube. With the carbon content in the tube increases, the length of bamboo decreases. The field emission performance of the array was studied. The results show that the carbon nanotube array is an excellent field emission material with an initial field strength of 0.37 V / μm, a threshold field strength of 0.9 V / μm and a field enhancement factor of 37 700.