Fabrication and Characterization of DNA-Wrapped Carbon Nanotubes

合成了DNA包裹的单壁碳纳米管（SWNTs）和双壁碳纳米管（DWNTs），并采用高效液相色谱（HPLC）对它们进行了长度分离。此外，我们已经发现，DNA包裹的单壁碳纳米管提供了一种有效的，可扩展的方式来制造高度隔离，结构分类的薄膜晶体管（TFT）的单壁碳纳米管的超均匀网络。DNA-SWNTs很容易形成均匀的、所需密度的单个纳米管网络。通过调节纳米管密度，即使不去除金属SWNT，也可以容易地实现具有10^3-10^5的开/关比的TFT。

DNA-wrapped single-wall carbon nanotubes (SWNTs) and double-wall carbon nanotubes (DWNTs) have been synthesized and are length-separated by high-performance liquid chromatography (HPLC) with a specially designed HPLC column. Furthermore, we have found that DNA-wrapped SWNTs provides an effective, scalable way to fabricate the super-uniform networks of highly isolated, structure-sorted SWNTs for thin-film transistors (TFTs). The DNA-SWNTs are easily formed into uniform, desired-density networks of individual nanotubes. By tuning the nanotube density, the TFTs with an on/off ratio of 10^3-10^5 can easily be achieved even without the removal of metallic SWNTs.