外加电场作用下碳纳米管结构稳定性及结构修饰研究

Study of structure stability and decoration of carbon nanotube under applied electric field

利用外加电场的方法,对多壁碳纳米管的结构稳定性进行了研究.结果表明当场强达到30V/nm时,碳纳米管端部的结构失稳,端部碳原子间的π键被打开,外部原子开始进入到碳纳米管的结构中.利用电子显微镜作为纳米加工仪器,通过外加电场的方法在多壁碳纳米管的端部制备了非晶态碳纳米线,形成碳纳米管-纳米线复合结构.碳纳米管和纳米线结合处的σ键作为绝缘界面,形成了电子输运的势垒.

Structure stability of multi-walled carbon nanotube under applied electric field has been investigated. The results show that anti-bonding between carbon atoms at the tip of nanotube resulting from the local field strength of - 30V/nm leads to structure instability. Using the electron microscope as the nanolaboratory, we have prepared amorphous carbon nanowires on the tip by incorporation of foreign hydrocarbon under the applied electric field, resulting in the nanotube/nanowire structure. Electric measurement indicates that the nanotube/nanowire structure has rectifying characteristics. Consequently, the applied electric field may have potential applications in structure decoration and device fabrication of carbon nanotubes.