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），并利用专门设计的高效液相色谱（HPLC）柱进行了长度分离。此外，我们发现dna包裹的SWNTs提供了一种有效的，可扩展的方法来制造用于薄膜晶体管（TFTs）的高度隔离，结构分类的SWNTs超均匀网络。DNA-SWNTs很容易形成均匀的、理想密度的单个纳米管网络。通过调整纳米管密度，即使不去除金属单壁碳纳米管，也可以很容易地实现10^3-10^5的开关比。

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.