Diameter Refinement of Semiconducting Arc Discharge Single-Walled Carbon Nanotubes via Density Gradient Ultracentrifugation
Diameter Refinement of Semiconducting Arc Discharge Single-Walled Carbon Nanotubes via Density Gradient Ultracentrifugation
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DOI：
10.1021/jz4013596
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发表时间：
2013-09-05
影响因子：
5.7
通讯作者：
Hersam, Mark C.
中科院分区：
文献类型：
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作者：
Seo, Jung-Woo T.;Yoder, Nathan L.;Hersam, Mark C.
电弧放电单壁碳纳米管（SWCNTs）具有最高的光学和电子性能，在光纤通信、生物医学成像和场效应晶体管等重要技术应用中具有重要意义。然而，生长的电弧放电单壁碳纳米管除了具有宽的直径分布（1.2至17 nm）之外还具有金属和半导体物质的混合物，这限制了它们在器件中的性能。虽然先前的合成后分选努力已经实现了金属电弧放电单壁碳纳米管的电子类型和直径细化的分离，但尚未实现半导体电弧放电单壁碳纳米管的紧密直径分布。在此，我们提出了密度梯度超离心的两个进展，其使得能够分离具有以类似于1.6和类似于1.4 nm为中心的窄直径分布的高纯度（>99%）半导体电弧放电SWCNT。由此产生的直径细化的半导体电弧放电单壁碳纳米管群体具有单分散特性，非常适合高性能的光学和电子技术。
Arc discharge single walled carbon nanotubes (SWCNTs) possess superlative optical and electronic properties that are of high interest for technologically important applications including fiber optic communications, biomedical imaging, and field-effect transistors. However, as grown arc discharge SWCNTs possess a mixture of metallic and semiconducting species in addition to a wide diameter distribution (1.2 to 17 nm) that limit their performance in devices. While previous postsynthetic sorting efforts have achieved separation by electronic type and diameter refinement for metallic are discharge SWCNTs, tight diameter distributions of semiconducting arc discharge SWCNTs have not yet been realized. Herein, we present two advance's in density gradient ultracentrifugation that enable the isolation of high purity (>99%) semiconducting arc discharge SWCNTs with narrow diameter distributions centered at similar to 1.6 and similar to 1.4 nm. The resulting,diameter-refined populations of semiconducting arc discharge SWCNTs possess monodisperse characteristics that are well-suited for high-performance optical and electronic technologies.