超薄双壁碳纳米管一种制备原子线的新型纳米容器
Ultra-Thin Double-Walled Carbon Nanotubes A Novel Nanocontainer for Preparing Atomic Wires
摘要：
采用氢弧放电法制备了高石墨化度的双壁碳纳米管。所获得的DWCNT具有内管和外管两者的直径的窄分布，并且超过一半的DWCNT具有在0.6-1.0 nm范围内的内径。测量了DWCNT阴极到阳极的场致电子发射，在4.3 V/μm的电场下，发射电流密度达到1 A/cm 2。经过高温处理的DWCNT，长的线性碳链（C链）可以在超薄DWCNT内生长，形成一种新的C链@DWCNT纳米结构，表明这些超薄DWCNT是一个合适的纳米容器，用于制备真正的一维纳米结构与一个原子直径。
英文摘要：
Double-walled carbon nanotubes (DWCNTs) with high graphitization have been synthesized by hydrogen arc discharge. The obtained DWCNTs have a narrow distribution of diameters of both the inner and outer tubes, and more than half of the DWCNTs have inner diameters in the range 0.6-1.0 nm. Field electron emission from a DWCNT cathode to an anode has been measured, and the emission current density of DWCNTs reached 1 A/cm2 at an applied field of about 4.3 V/μm. After high-temperature treatment of DWCNTs, long linear carbon chains (C-chains) can be grown inside the ultra-thin DWCNTs to form a novel C-chain@DWCNT nanostructure, showing that these ultra-thin DWCNTs are an appropriate nanocontainer for preparing truly one-dimensional nanostructures with one-atom-diameter.
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