Department of Materials Science & Engineering, ‡Department of Chemical Engineering, and §Department of Electrical Engineering, Stanford University , Stanford, California 94305, United States.
ACS Nano. 2017 Jun 27;11(6):5660-5669. doi: 10.1021/acsnano.7b01076. Epub 2017 May 24.
Selective extraction of semiconducting carbon nanotubes is a key step in the production of high-performance, solution-processed electronics. Here, we describe the ability of a supramolecular sorting polymer to selectively disperse semiconducting carbon nanotubes from five commercial sources with diameters ranging from 0.7 to 2.2 nm. The sorting purity of the largest-diameter nanotubes (1.4 to 2.2 nm; from Tuball) was confirmed by short channel measurements to be 97.5%. Removing the sorting polymer by acid-induced disassembly increased the transistor mobility by 94 and 24% for medium-diameter and large-diameter carbon nanotubes, respectively. Among the tested single-walled nanotube sources, the highest transistor performance of 61 cm/V·s and on/off ratio >10 were realized with arc discharge carbon nanotubes with a diameter range from 1.2 to 1.7 nm. The length and quality of nanotubes sorted from different sources is compared using measurements from atomic force microscopy and Raman spectroscopy. The transistor mobility is found to correlate with the G/D ratio extracted from the Raman spectra.
选择性提取半导体碳纳米管是生产高性能、溶液处理电子器件的关键步骤。在这里，我们描述了超分子分选聚合物的能力，它可以从五个商业来源中选择性地分散直径从 0.7 到 2.2nm 的半导体碳纳米管。通过短通道测量证实，最大直径纳米管（1.4 至 2.2nm；来自 Tuball）的分选纯度为 97.5%。通过酸诱导的解组装去除分选聚合物，分别使中直径和大直径碳纳米管的晶体管迁移率提高了 94%和 24%。在所测试的单壁碳纳米管来源中，用直径为 1.2 至 1.7nm 的电弧放电碳纳米管实现了最高的晶体管性能，为 61cm/V·s 和开关比>10。使用原子力显微镜和拉曼光谱测量比较了从不同来源分选的纳米管的长度和质量。发现晶体管迁移率与从拉曼光谱中提取的 G/D 比相关。
