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首页> 外文期刊>Nanotechnology >Systematic studies of covalent functionalization of carbon nanotubes via argon plasma-assisted UV grafting - art. no. 115712
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Systematic studies of covalent functionalization of carbon nanotubes via argon plasma-assisted UV grafting - art. no. 115712

机译：通过氩等离子体辅助UV接枝共价官能化碳纳米管的系统研究-艺术。没有。 115712

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摘要

Single-walled carbon nanotubes (SWNTs) with 1-vinylimidazole species covalently attached to their sidewalls and end caps have been prepared by ultraviolet (UV) irradiation in 1-vinylimidazole monomer. This process can be greatly assisted by argon (Ar) plasma pretreatment, which generates more defect sites at the tube ends and sidewalls acting as the active sites for the subsequent UV grafting of 1-vinylimidazole molecules. The effects of total deposited energy of Ar plasma treatment, either by change of treatment time or discharge power, on the functionalization degree and structural morphology of the resulting nanotubes are systematically studied. By control of the Ar plasma treatment time within 5 min at the discharge power of 200 W, no visible chopping of the functionalized SWNTs was observed. Under this advised optimum processing condition, the functionalization degree, estimated by x-ray photoelectron spectroscopy (XPS) measurement, is as high as around 26 wt% 1-vinylimidazole molecules grafted onto the nanotubes. This method may be extended to other reactive vinyl monomers and offers another diverse way of covalent functionalization of SWNTs.
机译：已经通过1-乙烯基咪唑单体中的紫外线（UV）辐照制备了具有1-乙烯基咪唑种类共价附于其侧壁和端盖的单壁碳纳米管（SWNT）。氩气（Ar）等离子体预处理可以极大地辅助此过程，该过程在管端和侧壁上产生更多的缺陷部位，这些缺陷部位是随后进行1-乙烯基咪唑分子的UV接枝的活性部位。系统地研究了通过改变处理时间或放电功率，氩等离子体处理的总沉积能量对所得纳米管的功能化程度和结构形态的影响。通过将200 W的放电功率控制在5分钟内的Ar等离子体处理时间，未观察到功能化SWNT的可见斩波。在这种建议的最佳加工条件下，通过X射线光电子能谱（XPS）测量估计的官能化程度高达约26 wt％的1-乙烯基咪唑分子接枝到纳米管上。该方法可以扩展到其他反应性乙烯基单体，并提供SWNT的另一种共价官能化方式。

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