Semiconductor-type single-walled carbon nanotubes (s-SWNTs) have unique electrical, mechanical, and optical properties and are considered as one of the most promising semiconductor materials to replace the continuation of Moore's Law for silicon. However, the SWNTs prepared by conventional methods are all mixtures of SWNTs with different conductivity properties, which greatly hinders the development of their excellent electronic properties and potential applications in many high-tech fields. Therefore, how to effectively obtain high-purity, high-quality s-SWNTs is the prerequisite for its application in electronic and optoelectronic devices. The Li Qingwen team of the Advanced Materials Department of the Suzhou Institute of Nanotechnology and Nano-Bionics, Chinese Academy of Sciences, has been conducting macroscopical separation and application of carbon nanotubes in aqueous and organic phases since 2008. In water phase research, the research team systematically studied the effects of dispersion conditions and gel structure on the separation of carbon nanotubes, and developed a new gel chromatography separation technology to achieve rapid, large-scale and continuous separation of s-SWCNTs. The research results have been published in many domestic and foreign journals such as J. Phys. Chem. C and Carbon. Recently, the research team has studied the selective effect of conjugated polymer structure on large-diameter semiconducting carbon nanotubes and designed successively aromatic polymer PFPXX and carbazole-based conjugated polymer series molecules containing macrocyclic conjugated planes. A batch, high purity semiconductor single-walled carbon nanotube solution was obtained (purity >99.9%, yield 500 g/h). The latest research results were published in Chem. Comm. 2013, 49(89), 10492-10494 and Small, DOI: 10.1002/smll.201600398 (Figure 1). In addition, the research team has used the conjugated small molecule 4HP for the first time to achieve high-efficiency separation of high-purity semiconducting carbon nanotubes, and this conjugated small molecule has photodegradability and can be used to prepare surface-clean carbon nanotube films ( figure 2). Related research results were recently received by the Carbon journal. In terms of applications, the research team used a high-purity single-walled carbon nanotube solution to prepare a large-area array of transistor devices, which performed well on key indicators such as uniformity and uniformity, with an average on/off ratio of 106, and a mobility of 67.5 cm2/Vs. (image 3). The research team conducted in-depth cooperation with the Peking University professor Peng Lianmao's research group to jointly realize the development of semiconductor-based carbon nanotube-based integrated circuits and display backplane drives, and achieved outstanding results. This series of work has received strong support from the National "973" Program Nanometer Special Project (2011CB932600), the National Natural Science Foundation of China (61274130, 21373262, 21073223, 20903069, 21104091), the Chinese Academy of Sciences, and the Suzhou Nanometer Institute.
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