多壁碳纳米管中的多通道弹道输运特性

Multi-channel ballistic transport in multi-wall carbon nanotubes

借助于扫描电子显微镜中可移动金属探针的测量系统,实现了探针电极与W衬底上生长的单根多壁碳纳米管一端的完美接触.研究了单根多壁碳纳米管室温下的电输运特性,发现多壁碳纳米管具有非常高的电流承载能力.对于直径100nm的碳纳米管,其电阻为34.4Ω,流经碳纳米管的最大电流可达7.27 mA,对应的电导为460—490G0.这一实验结果表明,大直径的多壁碳纳米管在室温下可以实现多通道弹道输运,是未来纳电子器件与电路的理想互联导线.

The electric transport properties of an individual vertical multi-wall carbon nanotube （MWCNT） were studied in situ at room temperature in a scanning electron microscope chamber. It was found that the single MWCNT has a large current-carrying capacity, and the maximum current can reach 7.27 mA. At the same time, a very low resistance of about 34.4Ω and a high conductance of about 460-490G0 were obtained. This indicates that large diameter MWCNTs exhibit multi-channel quasi-ballistic conduction , which can be attributed to the participation of multiple walls in electrical transport and the large diameter of the nanotubes.